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mongoose/mongoose.c
Sergey Lyubka e38061970e Exposed mg_authorize_digest()
2014-01-11 16:44:37 +00:00

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// Copyright (c) 2004-2013 Sergey Lyubka <valenok@gmail.com>
// Copyright (c) 2013 Cesanta Software Limited
// All rights reserved
//
// This library is dual-licensed: you can redistribute it and/or modify
// it under the terms of the GNU General Public License version 2 as
// published by the Free Software Foundation. For the terms of this
// license, see <http://www.gnu.org/licenses/>.
//
// You are free to use this library under the terms of the GNU General
// Public License, but WITHOUT ANY WARRANTY; without even the implied
// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
// See the GNU General Public License for more details.
//
// Alternatively, you can license this library under a commercial
// license, as set out in <http://cesanta.com/products.html>.
#undef UNICODE // Use ANSI WinAPI functions
#undef _UNICODE // Use multibyte encoding on Windows
#define _MBCS // Use multibyte encoding on Windows
#define _INTEGRAL_MAX_BITS 64 // Enable _stati64() on Windows
#define _CRT_SECURE_NO_WARNINGS // Disable deprecation warning in VS2005+
#undef WIN32_LEAN_AND_MEAN // Let windows.h always include winsock2.h
#define _XOPEN_SOURCE 600 // For flockfile() on Linux
#define __STDC_FORMAT_MACROS // <inttypes.h> wants this for C++
#define __STDC_LIMIT_MACROS // C++ wants that for INT64_MAX
#define _LARGEFILE_SOURCE // Enable fseeko() and ftello() functions
#define _FILE_OFFSET_BITS 64 // Enable 64-bit file offsets
#ifdef _MSC_VER
#pragma warning (disable : 4127) // FD_SET() emits warning, disable it
#pragma warning (disable : 4204) // missing c99 support
#endif
#include <sys/types.h>
#include <sys/stat.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <assert.h>
#include <errno.h>
#include <time.h>
#include <ctype.h>
#include <stdarg.h>
#ifdef _WIN32
#include <windows.h>
#include <process.h> // For _beginthread
#include <io.h> // For _lseeki64
#include <direct.h> // For _mkdir
typedef int socklen_t;
typedef HANDLE pid_t;
typedef SOCKET sock_t;
typedef unsigned char uint8_t;
typedef unsigned int uint32_t;
typedef unsigned short uint16_t;
typedef unsigned __int64 uint64_t;
typedef __int64 int64_t;
typedef CRITICAL_SECTION mutex_t;
typedef struct _stati64 file_stat_t;
#pragma comment(lib, "ws2_32.lib")
#define snprintf _snprintf
#define vsnprintf _vsnprintf
#define INT64_FMT "I64d"
#define mutex_init(x) InitializeCriticalSection(x)
#define mutex_destroy(x) DeleteCriticalSection(x)
#define mutex_lock(x) EnterCriticalSection(x)
#define mutex_unlock(x) LeaveCriticalSection(x)
#define get_thread_id() ((unsigned long) GetCurrentThreadId())
#define S_ISDIR(x) ((x) & _S_IFDIR)
#define sleep(x) Sleep((x) * 1000)
#define stat(x, y) mg_stat((x), (y))
#define fopen(x, y) mg_fopen((x), (y))
#define open(x, y) mg_open((x), (y))
#define lseek(x, y, z) _lseeki64((x), (y), (z))
#define mkdir(x, y) _mkdir(x)
#define to64(x) _atoi64(x)
#define flockfile(x)
#define funlockfile(x)
#ifndef va_copy
#define va_copy(x,y) x = y
#endif // MINGW #defines va_copy
#ifndef __func__
#define STRX(x) #x
#define STR(x) STRX(x)
#define __func__ __FILE__ ":" STR(__LINE__)
#endif
#else
#include <dirent.h>
#include <inttypes.h>
#include <pthread.h>
#include <pwd.h>
#include <signal.h>
#include <unistd.h>
#include <netdb.h>
#include <arpa/inet.h> // For inet_pton() when USE_IPV6 is defined
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/select.h>
#define closesocket(x) close(x)
typedef int sock_t;
typedef pthread_mutex_t mutex_t;
typedef struct stat file_stat_t;
#define mutex_init(x) pthread_mutex_init(x, NULL)
#define mutex_destroy(x) pthread_mutex_destroy(x)
#define mutex_lock(x) pthread_mutex_lock(x)
#define mutex_unlock(x) pthread_mutex_unlock(x)
#define get_thread_id() ((unsigned long) pthread_self())
#define INVALID_SOCKET ((sock_t) -1)
#define INT64_FMT PRId64
#define to64(x) strtoll(x, NULL, 10)
#define __cdecl
#define O_BINARY 0
#endif
#ifdef USE_SSL
// Following define gets rid of openssl deprecation messages
#define MAC_OS_X_VERSION_MIN_REQUIRED MAC_OS_X_VERSION_10_6
#ifdef USE_CYASSL
#include <openssl/ssl.h>
#else
typedef struct ssl_ctx_st SSL_CTX;
typedef struct ssl_st SSL;
typedef struct ssl_method_st SSL_METHOD;
extern void __cdecl SSL_free(SSL *);
extern int __cdecl SSL_accept(SSL *);
extern int __cdecl SSL_connect(SSL *);
extern int __cdecl SSL_read(SSL *, void *, int);
extern int __cdecl SSL_write(SSL *, const void *, int);
extern int __cdecl SSL_set_fd(SSL *, int);
extern SSL * __cdecl SSL_new(SSL_CTX *);
extern SSL_CTX * __cdecl SSL_CTX_new(SSL_METHOD *);
extern SSL_METHOD * __cdecl SSLv23_server_method(void);
extern int __cdecl SSL_library_init(void);
extern int __cdecl SSL_CTX_use_PrivateKey_file(SSL_CTX *, const char *, int);
extern int __cdecl SSL_CTX_use_certificate_file(SSL_CTX *, const char *, int);
extern int __cdecl SSL_CTX_use_certificate_chain_file(SSL_CTX *, const char *);
extern void __cdecl SSL_CTX_free(SSL_CTX *);
#endif
#endif
#include "mongoose.h"
struct ll { struct ll *prev, *next; };
#define LINKED_LIST_INIT(N) ((N)->next = (N)->prev = (N))
#define LINKED_LIST_DECLARE_AND_INIT(H) struct ll H = { &H, &H }
#define LINKED_LIST_ENTRY(P,T,N) ((T *)((char *)(P) - offsetof(T, N)))
#define LINKED_LIST_IS_EMPTY(N) ((N)->next == (N))
#define LINKED_LIST_FOREACH(H,N,T) \
for (N = (H)->next, T = (N)->next; N != (H); N = (T), T = (N)->next)
#define LINKED_LIST_ADD_TO_FRONT(H,N) do { ((H)->next)->prev = (N); \
(N)->next = ((H)->next); (N)->prev = (H); (H)->next = (N); } while (0)
#define LINKED_LIST_ADD_TO_TAIL(H,N) do { ((H)->prev)->next = (N); \
(N)->prev = ((H)->prev); (N)->next = (H); (H)->prev = (N); } while (0)
#define LINKED_LIST_REMOVE(N) do { ((N)->next)->prev = ((N)->prev); \
((N)->prev)->next = ((N)->next); LINKED_LIST_INIT(N); } while (0)
#define ARRAY_SIZE(array) (sizeof(array) / sizeof(array[0]))
#define MAX_REQUEST_SIZE 16384
#define IOBUF_SIZE 8192
#define MAX_PATH_SIZE 8192
#define LUA_SCRIPT_PATTERN "**.lp$"
#define CGI_ENVIRONMENT_SIZE 4096
#define MAX_CGI_ENVIR_VARS 64
#define ENV_EXPORT_TO_CGI "MONGOOSE_CGI"
#define PASSWORDS_FILE_NAME ".htpasswd"
#ifndef USE_WEBSOCKET_PING_INTERVAL
#define USE_WEBSOCKET_PING_INTERVAL 5
#endif
// Extra HTTP headers to send in every static file reply
#if !defined(USE_EXTRA_HTTP_HEADERS)
#define USE_EXTRA_HTTP_HEADERS ""
#endif
#ifndef USE_POST_SIZE_LIMIT
#define USE_POST_SIZE_LIMIT 0
#endif
#ifdef ENABLE_DBG
#define DBG(x) do { printf("%-20s ", __func__); printf x; putchar('\n'); \
fflush(stdout); } while(0)
#else
#define DBG(x)
#endif
#ifdef NO_FILESYSTEM
#define NO_AUTH
#define NO_CGI
#define NO_DAV
#define NO_DIRECTORY_LISTING
#define NO_LOGGING
#endif
union socket_address {
struct sockaddr sa;
struct sockaddr_in sin;
#ifdef USE_IPV6
struct sockaddr_in6 sin6;
#endif
};
struct vec {
const char *ptr;
int len;
};
struct uri_handler {
struct ll link;
char *uri;
mg_handler_t handler;
};
// For directory listing and WevDAV support
struct dir_entry {
struct connection *conn;
char *file_name;
file_stat_t st;
};
// NOTE(lsm): this enum shoulds be in sync with the config_options.
enum {
ACCESS_CONTROL_LIST,
#ifndef NO_FILESYSTEM
ACCESS_LOG_FILE, AUTH_DOMAIN, CGI_INTERPRETER,
CGI_PATTERN, DAV_AUTH_FILE, DOCUMENT_ROOT, ENABLE_DIRECTORY_LISTING,
#endif
EXTRA_MIME_TYPES,
#ifndef NO_FILESYSTEM
GLOBAL_AUTH_FILE,
#endif
HIDE_FILES_PATTERN,
IDLE_TIMEOUT_MS,
#ifndef NO_FILESYSTEM
INDEX_FILES,
#endif
LISTENING_PORT,
#ifndef _WIN32
RUN_AS_USER,
#endif
#ifdef USE_SSL
SSL_CERTIFICATE,
#endif
URL_REWRITES, NUM_OPTIONS
};
static const char *static_config_options[] = {
"access_control_list", NULL,
#ifndef NO_FILESYSTEM
"access_log_file", NULL,
"auth_domain", "mydomain.com",
"cgi_interpreter", NULL,
"cgi_pattern", "**.cgi$|**.pl$|**.php$",
"dav_auth_file", NULL,
"document_root", NULL,
"enable_directory_listing", "yes",
#endif
"extra_mime_types", NULL,
#ifndef NO_FILESYSTEM
"global_auth_file", NULL,
#endif
"hide_files_patterns", NULL,
"idle_timeout_ms", "30000",
#ifndef NO_FILESYSTEM
"index_files","index.html,index.htm,index.cgi,index.php,index.lp",
#endif
"listening_port", NULL,
#ifndef _WIN32
"run_as_user", NULL,
#endif
#ifdef USE_SSL
"ssl_certificate", NULL,
#endif
"url_rewrites", NULL,
NULL
};
struct mg_server {
sock_t listening_sock;
union socket_address lsa; // Listening socket address
struct ll active_connections;
struct ll uri_handlers;
char *config_options[NUM_OPTIONS];
void *server_data;
void *ssl_ctx; // SSL context
sock_t ctl[2]; // Control socketpair. Used to wake up from select() call
};
// Expandable IO buffer
struct iobuf {
char *buf; // Buffer that holds the data
int size; // Buffer size
int len; // Number of bytes currently in a buffer
};
// Local endpoint representation
union endpoint {
int fd; // Opened regular local file
sock_t cgi_sock; // CGI socket
void *ssl; // SSL descriptor
struct uri_handler *uh; // URI handler user function
};
enum endpoint_type { EP_NONE, EP_FILE, EP_CGI, EP_USER, EP_PUT };
enum connection_flags {
CONN_CLOSE = 1, CONN_SPOOL_DONE = 2, CONN_SSL_HANDS_SHAKEN = 4,
CONN_HEADERS_SENT = 8, CONN_BUFFER = 16
};
struct connection {
struct mg_connection mg_conn; // XXX: Must be first
struct ll link; // Linkage to server->active_connections
struct mg_server *server;
sock_t client_sock; // Connected client
struct iobuf local_iobuf;
struct iobuf remote_iobuf;
union endpoint endpoint;
enum endpoint_type endpoint_type;
time_t birth_time;
time_t last_activity_time;
char *path_info;
char *request;
int64_t num_bytes_sent; // Total number of bytes sent
int64_t cl; // Reply content length, for Range support
int request_len; // Request length, including last \r\n after last header
int flags; // CONN_* flags: CONN_CLOSE, CONN_SPOOL_DONE, etc
void *ssl; // SSL descriptor
};
static void close_local_endpoint(struct connection *conn);
static const struct {
const char *extension;
size_t ext_len;
const char *mime_type;
} static_builtin_mime_types[] = {
{".html", 5, "text/html"},
{".htm", 4, "text/html"},
{".shtm", 5, "text/html"},
{".shtml", 6, "text/html"},
{".css", 4, "text/css"},
{".js", 3, "application/x-javascript"},
{".ico", 4, "image/x-icon"},
{".gif", 4, "image/gif"},
{".jpg", 4, "image/jpeg"},
{".jpeg", 5, "image/jpeg"},
{".png", 4, "image/png"},
{".svg", 4, "image/svg+xml"},
{".txt", 4, "text/plain"},
{".torrent", 8, "application/x-bittorrent"},
{".wav", 4, "audio/x-wav"},
{".mp3", 4, "audio/x-mp3"},
{".mid", 4, "audio/mid"},
{".m3u", 4, "audio/x-mpegurl"},
{".ogg", 4, "application/ogg"},
{".ram", 4, "audio/x-pn-realaudio"},
{".xml", 4, "text/xml"},
{".json", 5, "text/json"},
{".xslt", 5, "application/xml"},
{".xsl", 4, "application/xml"},
{".ra", 3, "audio/x-pn-realaudio"},
{".doc", 4, "application/msword"},
{".exe", 4, "application/octet-stream"},
{".zip", 4, "application/x-zip-compressed"},
{".xls", 4, "application/excel"},
{".tgz", 4, "application/x-tar-gz"},
{".tar", 4, "application/x-tar"},
{".gz", 3, "application/x-gunzip"},
{".arj", 4, "application/x-arj-compressed"},
{".rar", 4, "application/x-arj-compressed"},
{".rtf", 4, "application/rtf"},
{".pdf", 4, "application/pdf"},
{".swf", 4, "application/x-shockwave-flash"},
{".mpg", 4, "video/mpeg"},
{".webm", 5, "video/webm"},
{".mpeg", 5, "video/mpeg"},
{".mov", 4, "video/quicktime"},
{".mp4", 4, "video/mp4"},
{".m4v", 4, "video/x-m4v"},
{".asf", 4, "video/x-ms-asf"},
{".avi", 4, "video/x-msvideo"},
{".bmp", 4, "image/bmp"},
{".ttf", 4, "application/x-font-ttf"},
{NULL, 0, NULL}
};
void *mg_start_thread(void *(*f)(void *), void *p) {
#ifdef _WIN32
return (void *) _beginthread((void (__cdecl *)(void *)) f, 0, p);
#else
pthread_t thread_id = (pthread_t) 0;
pthread_attr_t attr;
(void) pthread_attr_init(&attr);
(void) pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
#if USE_STACK_SIZE > 1
// Compile-time option to control stack size, e.g. -DUSE_STACK_SIZE=16384
(void) pthread_attr_setstacksize(&attr, USE_STACK_SIZE);
#endif
pthread_create(&thread_id, &attr, f, p);
pthread_attr_destroy(&attr);
return (void *) thread_id;
#endif
}
#ifdef _WIN32
// Encode 'path' which is assumed UTF-8 string, into UNICODE string.
// wbuf and wbuf_len is a target buffer and its length.
static void to_unicode(const char *path, wchar_t *wbuf, size_t wbuf_len) {
char buf[MAX_PATH_SIZE * 2], buf2[MAX_PATH_SIZE * 2], *p;
strncpy(buf, path, sizeof(buf));
buf[sizeof(buf) - 1] = '\0';
// Trim trailing slashes
p = buf + strlen(buf) - 1;
while (p > buf && p[0] == '\\' || p[0] == '/') *p-- = '\0';
//change_slashes_to_backslashes(buf);
// Convert to Unicode and back. If doubly-converted string does not
// match the original, something is fishy, reject.
memset(wbuf, 0, wbuf_len * sizeof(wchar_t));
MultiByteToWideChar(CP_UTF8, 0, buf, -1, wbuf, (int) wbuf_len);
WideCharToMultiByte(CP_UTF8, 0, wbuf, (int) wbuf_len, buf2, sizeof(buf2),
NULL, NULL);
if (strcmp(buf, buf2) != 0) {
wbuf[0] = L'\0';
}
}
static int mg_stat(const char *path, file_stat_t *st) {
wchar_t wpath[MAX_PATH_SIZE];
to_unicode(path, wpath, ARRAY_SIZE(wpath));
DBG(("[%ls] -> %d", wpath, _wstati64(wpath, st)));
return _wstati64(wpath, st);
}
static FILE *mg_fopen(const char *path, const char *mode) {
wchar_t wpath[MAX_PATH_SIZE], wmode[10];
to_unicode(path, wpath, ARRAY_SIZE(wpath));
to_unicode(mode, wmode, ARRAY_SIZE(wmode));
return _wfopen(wpath, wmode);
}
static int mg_open(const char *path, int flag) {
wchar_t wpath[MAX_PATH_SIZE];
to_unicode(path, wpath, ARRAY_SIZE(wpath));
return _wopen(wpath, flag);
}
#endif
static void set_close_on_exec(int fd) {
#ifdef _WIN32
(void) SetHandleInformation((HANDLE) fd, HANDLE_FLAG_INHERIT, 0);
#else
fcntl(fd, F_SETFD, FD_CLOEXEC);
#endif
}
static void set_non_blocking_mode(sock_t sock) {
#ifdef _WIN32
unsigned long on = 1;
ioctlsocket(sock, FIONBIO, &on);
#else
int flags = fcntl(sock, F_GETFL, 0);
fcntl(sock, F_SETFL, flags | O_NONBLOCK);
#endif
}
// A helper function for traversing a comma separated list of values.
// It returns a list pointer shifted to the next value, or NULL if the end
// of the list found.
// Value is stored in val vector. If value has form "x=y", then eq_val
// vector is initialized to point to the "y" part, and val vector length
// is adjusted to point only to "x".
static const char *next_option(const char *list, struct vec *val,
struct vec *eq_val) {
if (list == NULL || *list == '\0') {
// End of the list
list = NULL;
} else {
val->ptr = list;
if ((list = strchr(val->ptr, ',')) != NULL) {
// Comma found. Store length and shift the list ptr
val->len = list - val->ptr;
list++;
} else {
// This value is the last one
list = val->ptr + strlen(val->ptr);
val->len = list - val->ptr;
}
if (eq_val != NULL) {
// Value has form "x=y", adjust pointers and lengths
// so that val points to "x", and eq_val points to "y".
eq_val->len = 0;
eq_val->ptr = (const char *) memchr(val->ptr, '=', val->len);
if (eq_val->ptr != NULL) {
eq_val->ptr++; // Skip over '=' character
eq_val->len = val->ptr + val->len - eq_val->ptr;
val->len = (eq_val->ptr - val->ptr) - 1;
}
}
}
return list;
}
static int spool(struct iobuf *io, const void *buf, int len) {
static const double mult = 1.2;
char *p = NULL;
int new_len = 0;
assert(io->len >= 0);
assert(io->len <= io->size);
//DBG(("1. %d %d %d", len, io->len, io->size));
if (len <= 0) {
} else if ((new_len = io->len + len) < io->size) {
memcpy(io->buf + io->len, buf, len);
io->len = new_len;
} else if ((p = (char *) realloc(io->buf, (int) (new_len * mult))) != NULL) {
io->buf = p;
memcpy(io->buf + io->len, buf, len);
io->len = new_len;
io->size = (int) (new_len * mult);
} else {
len = 0;
}
//DBG(("%d %d %d", len, io->len, io->size));
return len;
}
// Like snprintf(), but never returns negative value, or a value
// that is larger than a supplied buffer.
static int mg_vsnprintf(char *buf, size_t buflen, const char *fmt, va_list ap) {
int n;
if (buflen < 1) return 0;
n = vsnprintf(buf, buflen, fmt, ap);
if (n < 0) {
n = 0;
} else if (n >= (int) buflen) {
n = (int) buflen - 1;
}
buf[n] = '\0';
return n;
}
static int mg_snprintf(char *buf, size_t buflen, const char *fmt, ...) {
va_list ap;
int n;
va_start(ap, fmt);
n = mg_vsnprintf(buf, buflen, fmt, ap);
va_end(ap);
return n;
}
// Check whether full request is buffered. Return:
// -1 if request is malformed
// 0 if request is not yet fully buffered
// >0 actual request length, including last \r\n\r\n
static int get_request_len(const char *s, int buf_len) {
const unsigned char *buf = (unsigned char *) s;
int i;
for (i = 0; i < buf_len; i++) {
// Control characters are not allowed but >=128 are.
// Abort scan as soon as one malformed character is found.
if (!isprint(buf[i]) && buf[i] != '\r' && buf[i] != '\n' && buf[i] < 128) {
return -1;
} else if (buf[i] == '\n' && i + 1 < buf_len && buf[i + 1] == '\n') {
return i + 2;
} else if (buf[i] == '\n' && i + 2 < buf_len && buf[i + 1] == '\r' &&
buf[i + 2] == '\n') {
return i + 3;
}
}
return 0;
}
// Skip the characters until one of the delimiters characters found.
// 0-terminate resulting word. Skip the rest of the delimiters if any.
// Advance pointer to buffer to the next word. Return found 0-terminated word.
static char *skip(char **buf, const char *delimiters) {
char *p, *begin_word, *end_word, *end_delimiters;
begin_word = *buf;
end_word = begin_word + strcspn(begin_word, delimiters);
end_delimiters = end_word + strspn(end_word, delimiters);
for (p = end_word; p < end_delimiters; p++) {
*p = '\0';
}
*buf = end_delimiters;
return begin_word;
}
// Parse HTTP headers from the given buffer, advance buffer to the point
// where parsing stopped.
static void parse_http_headers(char **buf, struct mg_connection *ri) {
size_t i;
for (i = 0; i < ARRAY_SIZE(ri->http_headers); i++) {
ri->http_headers[i].name = skip(buf, ": ");
ri->http_headers[i].value = skip(buf, "\r\n");
if (ri->http_headers[i].name[0] == '\0')
break;
ri->num_headers = i + 1;
}
}
static const char *status_code_to_str(int status_code) {
switch (status_code) {
case 200: return "OK";
case 201: return "Created";
case 204: return "No Content";
case 301: return "Moved Permanently";
case 302: return "Found";
case 304: return "Not Modified";
case 400: return "Bad Request";
case 403: return "Forbidden";
case 404: return "Not Found";
case 405: return "Method Not Allowed";
case 409: return "Conflict";
case 411: return "Length Required";
case 413: return "Request Entity Too Large";
case 415: return "Unsupported Media Type";
case 423: return "Locked";
case 500: return "Server Error";
case 501: return "Not Implemented";
default: return "Server Error";
}
}
static void send_http_error(struct connection *conn, int code,
const char *fmt, ...) {
const char *message = status_code_to_str(code);
const char *rewrites = conn->server->config_options[URL_REWRITES];
char headers[200], body[200];
struct vec a, b;
va_list ap;
int body_len, headers_len, match_code;
// Handle error code rewrites
while ((rewrites = next_option(rewrites, &a, &b)) != NULL) {
if ((match_code = atoi(a.ptr)) > 0 && match_code == code) {
conn->mg_conn.status_code = 302;
mg_printf(&conn->mg_conn, "HTTP/1.1 %d Moved\r\n"
"Location: %.*s?code=%d&orig_uri=%s\r\n\r\n",
conn->mg_conn.status_code, b.len, b.ptr, code,
conn->mg_conn.uri);
close_local_endpoint(conn);
return;
}
}
conn->mg_conn.status_code = code;
body_len = mg_snprintf(body, sizeof(body), "%d %s\n", code, message);
if (fmt != NULL) {
body[body_len++] = '\n';
va_start(ap, fmt);
body_len += mg_snprintf(body + body_len, sizeof(body) - body_len, fmt, ap);
va_end(ap);
}
if (code >= 300 && code <= 399) {
// 3xx errors do not have body
body_len = 0;
}
headers_len = mg_snprintf(headers, sizeof(headers),
"HTTP/1.1 %d %s\r\nContent-Length: %d\r\n"
"Content-Type: text/plain\r\n\r\n",
code, message, body_len);
spool(&conn->remote_iobuf, headers, headers_len);
spool(&conn->remote_iobuf, body, body_len);
close_local_endpoint(conn); // This will write to the log file
}
// Print message to buffer. If buffer is large enough to hold the message,
// return buffer. If buffer is to small, allocate large enough buffer on heap,
// and return allocated buffer.
static int alloc_vprintf(char **buf, size_t size, const char *fmt, va_list ap) {
va_list ap_copy;
int len;
// Windows is not standard-compliant, and vsnprintf() returns -1 if
// buffer is too small. Also, older versions of msvcrt.dll do not have
// _vscprintf(). However, if size is 0, vsnprintf() behaves correctly.
// Therefore, we make two passes: on first pass, get required message length.
// On second pass, actually print the message.
va_copy(ap_copy, ap);
len = vsnprintf(NULL, 0, fmt, ap_copy);
if (len > (int) size &&
(size = len + 1) > 0 &&
(*buf = (char *) malloc(size)) == NULL) {
len = -1; // Allocation failed, mark failure
} else {
va_copy(ap_copy, ap);
vsnprintf(*buf, size, fmt, ap_copy);
}
return len;
}
static void write_chunk(struct connection *conn, const char *buf, int len) {
char chunk_size[50];
int n = mg_snprintf(chunk_size, sizeof(chunk_size), "%X\r\n", len);
spool(&conn->remote_iobuf, chunk_size, n);
spool(&conn->remote_iobuf, buf, len);
spool(&conn->remote_iobuf, "\r\n", 2);
}
int mg_vprintf(struct mg_connection *conn, const char *fmt, va_list ap,
int chunked) {
char mem[IOBUF_SIZE], *buf = mem;
int len;
if ((len = alloc_vprintf(&buf, sizeof(mem), fmt, ap)) > 0) {
if (chunked) {
write_chunk((struct connection *) conn, buf, len);
} else {
len = mg_write(conn, buf, (size_t) len);
}
}
if (buf != mem && buf != NULL) {
free(buf);
}
return len;
}
int mg_printf(struct mg_connection *conn, const char *fmt, ...) {
int len;
va_list ap;
va_start(ap, fmt);
len = mg_vprintf(conn, fmt, ap, 0);
va_end(ap);
return len;
}
static int mg_socketpair(sock_t sp[2]) {
struct sockaddr_in sa;
sock_t sock, ret = -1;
socklen_t len = sizeof(sa);
sp[0] = sp[1] = INVALID_SOCKET;
(void) memset(&sa, 0, sizeof(sa));
sa.sin_family = AF_INET;
sa.sin_port = htons(0);
sa.sin_addr.s_addr = htonl(0x7f000001);
if ((sock = socket(AF_INET, SOCK_STREAM, 0)) != INVALID_SOCKET &&
!bind(sock, (struct sockaddr *) &sa, len) &&
!listen(sock, 1) &&
!getsockname(sock, (struct sockaddr *) &sa, &len) &&
(sp[0] = socket(AF_INET, SOCK_STREAM, 6)) != -1 &&
!connect(sp[0], (struct sockaddr *) &sa, len) &&
(sp[1] = accept(sock,(struct sockaddr *) &sa, &len)) != INVALID_SOCKET) {
set_close_on_exec(sp[0]);
set_close_on_exec(sp[1]);
ret = 0;
} else {
if (sp[0] != INVALID_SOCKET) closesocket(sp[0]);
if (sp[1] != INVALID_SOCKET) closesocket(sp[1]);
sp[0] = sp[1] = INVALID_SOCKET;
}
closesocket(sock);
return ret;
}
static int is_error(int n) {
return n == 0 || (n < 0 && errno != EINTR && errno != EAGAIN);
}
#ifndef NO_CGI
#ifdef _WIN32
struct threadparam {
sock_t s;
HANDLE hPipe;
};
static int wait_until_ready(sock_t sock, int for_read) {
fd_set set;
FD_ZERO(&set);
FD_SET(sock, &set);
select(sock + 1, for_read ? &set : 0, for_read ? 0 : &set, 0, 0);
return 1;
}
static void *push_to_stdin(void *arg) {
struct threadparam *tp = arg;
int n, sent, stop = 0;
DWORD k;
char buf[IOBUF_SIZE];
while (!stop && wait_until_ready(tp->s, 1) &&
(n = recv(tp->s, buf, sizeof(buf), 0)) > 0) {
if (n == -1 && GetLastError() == WSAEWOULDBLOCK) continue;
for (sent = 0; !stop && sent < n; sent += k) {
if (!WriteFile(tp->hPipe, buf + sent, n - sent, &k, 0)) stop = 1;
}
}
DBG(("%s", "FORWARED EVERYTHING TO CGI"));
CloseHandle(tp->hPipe);
free(tp);
_endthread();
return NULL;
}
static void *pull_from_stdout(void *arg) {
struct threadparam *tp = arg;
int k, stop = 0;
DWORD n, sent;
char buf[IOBUF_SIZE];
while (!stop && ReadFile(tp->hPipe, buf, sizeof(buf), &n, NULL)) {
for (sent = 0; !stop && sent < n; sent += k) {
if (wait_until_ready(tp->s, 0) &&
(k = send(tp->s, buf + sent, n - sent, 0)) <= 0) stop = 1;
}
}
DBG(("%s", "EOF FROM CGI"));
CloseHandle(tp->hPipe);
shutdown(tp->s, 2); // Without this, IO thread may get truncated data
closesocket(tp->s);
free(tp);
_endthread();
return NULL;
}
static void spawn_stdio_thread(int sock, HANDLE hPipe, void *(*func)(void *)) {
struct threadparam *tp = malloc(sizeof(*tp));
if (tp != NULL) {
tp->s = sock;
tp->hPipe = hPipe;
mg_start_thread(func, tp);
}
}
static pid_t start_process(char *interp, const char *cmd, const char *env,
const char *envp[], const char *dir, sock_t sock) {
STARTUPINFOA si = {0};
PROCESS_INFORMATION pi = {0};
HANDLE a[2], b[2], me = GetCurrentProcess();
char cmdline[MAX_PATH_SIZE], full_dir[MAX_PATH_SIZE], buf[MAX_PATH_SIZE], *p;
DWORD flags = DUPLICATE_CLOSE_SOURCE | DUPLICATE_SAME_ACCESS;
FILE *fp;
si.cb = sizeof(si);
si.dwFlags = STARTF_USESTDHANDLES | STARTF_USESHOWWINDOW;
si.wShowWindow = SW_HIDE;
si.hStdError = GetStdHandle(STD_ERROR_HANDLE);
CreatePipe(&a[0], &a[1], NULL, 0);
CreatePipe(&b[0], &b[1], NULL, 0);
DuplicateHandle(me, a[0], me, &si.hStdInput, 0, TRUE, flags);
DuplicateHandle(me, b[1], me, &si.hStdOutput, 0, TRUE, flags);
if (interp == NULL && (fp = fopen(cmd, "r")) != NULL) {
buf[0] = buf[1] = '\0';
fgets(buf, sizeof(buf), fp);
buf[sizeof(buf) - 1] = '\0';
if (buf[0] == '#' && buf[1] == '!') {
interp = buf + 2;
for (p = interp + strlen(interp);
isspace(* (uint8_t *) p) && p > interp; p--) *p = '\0';
}
fclose(fp);
}
if (interp != NULL) {
GetFullPathName(interp, sizeof(buf), buf, NULL);
interp = buf;
}
GetFullPathName(dir, sizeof(full_dir), full_dir, NULL);
mg_snprintf(cmdline, sizeof(cmdline), "%s%s\"%s\"",
interp ? interp : "", interp ? " " : "", cmd);
if (CreateProcess(NULL, cmdline, NULL, NULL, TRUE, CREATE_NEW_PROCESS_GROUP,
(void *) env, full_dir, &si, &pi) != 0) {
spawn_stdio_thread(sock, a[1], push_to_stdin);
spawn_stdio_thread(sock, b[0], pull_from_stdout);
} else {
CloseHandle(a[1]);
CloseHandle(b[0]);
closesocket(sock);
}
DBG(("CGI command: [%s] -> %p", cmdline, pi.hProcess));
CloseHandle(si.hStdOutput);
CloseHandle(si.hStdInput);
CloseHandle(a[0]);
CloseHandle(b[1]);
CloseHandle(pi.hThread);
CloseHandle(pi.hProcess);
return pi.hProcess;
}
#else
static pid_t start_process(const char *interp, const char *cmd, const char *env,
const char *envp[], const char *dir, sock_t sock) {
char buf[500];
pid_t pid = fork();
(void) env;
if (pid == 0) {
chdir(dir);
dup2(sock, 0);
dup2(sock, 1);
closesocket(sock);
// After exec, all signal handlers are restored to their default values,
// with one exception of SIGCHLD. According to POSIX.1-2001 and Linux's
// implementation, SIGCHLD's handler will leave unchanged after exec
// if it was set to be ignored. Restore it to default action.
signal(SIGCHLD, SIG_DFL);
if (interp == NULL) {
execle(cmd, cmd, NULL, envp);
} else {
execle(interp, interp, cmd, NULL, envp);
}
snprintf(buf, sizeof(buf), "Status: 500\r\n\r\n"
"500 Server Error: %s%s%s: %s", interp == NULL ? "" : interp,
interp == NULL ? "" : " ", cmd, strerror(errno));
send(1, buf, strlen(buf), 0);
exit(EXIT_FAILURE); // exec call failed
}
return pid;
}
#endif // _WIN32
// This structure helps to create an environment for the spawned CGI program.
// Environment is an array of "VARIABLE=VALUE\0" ASCIIZ strings,
// last element must be NULL.
// However, on Windows there is a requirement that all these VARIABLE=VALUE\0
// strings must reside in a contiguous buffer. The end of the buffer is
// marked by two '\0' characters.
// We satisfy both worlds: we create an envp array (which is vars), all
// entries are actually pointers inside buf.
struct cgi_env_block {
struct mg_connection *conn;
char buf[CGI_ENVIRONMENT_SIZE]; // Environment buffer
const char *vars[MAX_CGI_ENVIR_VARS]; // char *envp[]
int len; // Space taken
int nvars; // Number of variables in envp[]
};
// Append VARIABLE=VALUE\0 string to the buffer, and add a respective
// pointer into the vars array.
static char *addenv(struct cgi_env_block *block, const char *fmt, ...) {
int n, space;
char *added;
va_list ap;
// Calculate how much space is left in the buffer
space = sizeof(block->buf) - block->len - 2;
assert(space >= 0);
// Make a pointer to the free space int the buffer
added = block->buf + block->len;
// Copy VARIABLE=VALUE\0 string into the free space
va_start(ap, fmt);
n = mg_vsnprintf(added, (size_t) space, fmt, ap);
va_end(ap);
// Make sure we do not overflow buffer and the envp array
if (n > 0 && n + 1 < space &&
block->nvars < (int) ARRAY_SIZE(block->vars) - 2) {
// Append a pointer to the added string into the envp array
block->vars[block->nvars++] = added;
// Bump up used length counter. Include \0 terminator
block->len += n + 1;
}
return added;
}
static void addenv2(struct cgi_env_block *blk, const char *name) {
const char *s;
if ((s = getenv(name)) != NULL) addenv(blk, "%s=%s", name, s);
}
static void prepare_cgi_environment(struct connection *conn,
const char *prog,
struct cgi_env_block *blk) {
struct mg_connection *ri = &conn->mg_conn;
const char *s, *slash;
char *p, **opts = conn->server->config_options;
int i;
blk->len = blk->nvars = 0;
blk->conn = ri;
addenv(blk, "SERVER_NAME=%s", opts[AUTH_DOMAIN]);
addenv(blk, "SERVER_ROOT=%s", opts[DOCUMENT_ROOT]);
addenv(blk, "DOCUMENT_ROOT=%s", opts[DOCUMENT_ROOT]);
addenv(blk, "SERVER_SOFTWARE=%s/%s", "Mongoose", MONGOOSE_VERSION);
// Prepare the environment block
addenv(blk, "%s", "GATEWAY_INTERFACE=CGI/1.1");
addenv(blk, "%s", "SERVER_PROTOCOL=HTTP/1.1");
addenv(blk, "%s", "REDIRECT_STATUS=200"); // For PHP
// TODO(lsm): fix this for IPv6 case
//addenv(blk, "SERVER_PORT=%d", ri->remote_port);
addenv(blk, "REQUEST_METHOD=%s", ri->request_method);
addenv(blk, "REMOTE_ADDR=%s", ri->remote_ip);
addenv(blk, "REMOTE_PORT=%d", ri->remote_port);
addenv(blk, "REQUEST_URI=%s%s%s", ri->uri,
ri->query_string == NULL ? "" : "?",
ri->query_string == NULL ? "" : ri->query_string);
// SCRIPT_NAME
if (conn->path_info != NULL) {
addenv(blk, "SCRIPT_NAME=%.*s",
(int) (strlen(ri->uri) - strlen(conn->path_info)), ri->uri);
addenv(blk, "PATH_INFO=%s", conn->path_info);
} else {
s = strrchr(prog, '/');
slash = strrchr(ri->uri, '/');
addenv(blk, "SCRIPT_NAME=%.*s%s",
slash == NULL ? 0 : (int) (slash - ri->uri), ri->uri,
s == NULL ? prog : s);
}
addenv(blk, "SCRIPT_FILENAME=%s", prog);
addenv(blk, "PATH_TRANSLATED=%s", prog);
addenv(blk, "HTTPS=%s", conn->ssl != NULL ? "on" : "off");
if ((s = mg_get_header(ri, "Content-Type")) != NULL)
addenv(blk, "CONTENT_TYPE=%s", s);
if (ri->query_string != NULL)
addenv(blk, "QUERY_STRING=%s", ri->query_string);
if ((s = mg_get_header(ri, "Content-Length")) != NULL)
addenv(blk, "CONTENT_LENGTH=%s", s);
addenv2(blk, "PATH");
addenv2(blk, "PERLLIB");
addenv2(blk, ENV_EXPORT_TO_CGI);
#if defined(_WIN32)
addenv2(blk, "COMSPEC");
addenv2(blk, "SYSTEMROOT");
addenv2(blk, "SystemDrive");
addenv2(blk, "ProgramFiles");
addenv2(blk, "ProgramFiles(x86)");
addenv2(blk, "CommonProgramFiles(x86)");
#else
addenv2(blk, "LD_LIBRARY_PATH");
#endif // _WIN32
// Add all headers as HTTP_* variables
for (i = 0; i < ri->num_headers; i++) {
p = addenv(blk, "HTTP_%s=%s",
ri->http_headers[i].name, ri->http_headers[i].value);
// Convert variable name into uppercase, and change - to _
for (; *p != '=' && *p != '\0'; p++) {
if (*p == '-')
*p = '_';
*p = (char) toupper(* (unsigned char *) p);
}
}
blk->vars[blk->nvars++] = NULL;
blk->buf[blk->len++] = '\0';
assert(blk->nvars < (int) ARRAY_SIZE(blk->vars));
assert(blk->len > 0);
assert(blk->len < (int) sizeof(blk->buf));
}
static const char cgi_status[] = "HTTP/1.1 200 OK\r\n";
static void open_cgi_endpoint(struct connection *conn, const char *prog) {
struct cgi_env_block blk;
char dir[MAX_PATH_SIZE], *p = NULL;
sock_t fds[2];
prepare_cgi_environment(conn, prog, &blk);
// CGI must be executed in its own directory. 'dir' must point to the
// directory containing executable program, 'p' must point to the
// executable program name relative to 'dir'.
mg_snprintf(dir, sizeof(dir), "%s", prog);
if ((p = strrchr(dir, '/')) != NULL) {
*p++ = '\0';
} else {
dir[0] = '.', dir[1] = '\0';
p = (char *) prog;
}
// Try to create socketpair in a loop until success. mg_socketpair()
// can be interrupted by a signal and fail.
// TODO(lsm): use sigaction to restart interrupted syscall
do {
mg_socketpair(fds);
} while (fds[0] == INVALID_SOCKET);
if (start_process(conn->server->config_options[CGI_INTERPRETER],
prog, blk.buf, blk.vars, dir, fds[1]) > 0) {
conn->endpoint_type = EP_CGI;
conn->endpoint.cgi_sock = fds[0];
spool(&conn->remote_iobuf, cgi_status, sizeof(cgi_status) - 1);
conn->flags |= CONN_BUFFER;
} else {
closesocket(fds[0]);
send_http_error(conn, 500, "start_process(%s) failed", prog);
}
#ifndef _WIN32
closesocket(fds[1]); // On Windows, CGI stdio thread closes that socket
#endif
}
static void read_from_cgi(struct connection *conn) {
struct iobuf *io = &conn->remote_iobuf;
char buf[IOBUF_SIZE], buf2[sizeof(buf)], *s = buf2;
const char *status = "500";
struct mg_connection c;
int len, s_len = sizeof(cgi_status) - 1,
n = recv(conn->endpoint.cgi_sock, buf, sizeof(buf), 0);
DBG(("%p %d", conn, n));
if (is_error(n)) {
close_local_endpoint(conn);
} else if (n > 0) {
spool(&conn->remote_iobuf, buf, n);
if (conn->flags & CONN_BUFFER) {
len = get_request_len(io->buf + s_len, io->len - s_len);
if (len == 0) return;
if (len > 0) {
memset(&c, 0, sizeof(c));
memcpy(buf2, io->buf + s_len, len);
buf2[len - 1] = '\0';
parse_http_headers(&s, &c);
if (mg_get_header(&c, "Location") != NULL) {
status = "302";
} else if ((status = (char *) mg_get_header(&c, "Status")) == NULL) {
status = "200";
}
}
memcpy(io->buf + 9, status, 3);
conn->flags &= ~CONN_BUFFER;
}
}
}
static void forward_post_data(struct connection *conn) {
struct iobuf *io = &conn->local_iobuf;
int n = send(conn->endpoint.cgi_sock, io->buf, io->len, 0);
if (n > 0) {
memmove(io->buf, io->buf + n, io->len - n);
io->len -= n;
}
}
#endif // !NO_CGI
// 'sa' must be an initialized address to bind to
static sock_t open_listening_socket(union socket_address *sa) {
sock_t on = 1, sock = INVALID_SOCKET;
if ((sock = socket(sa->sa.sa_family, SOCK_STREAM, 6)) == INVALID_SOCKET ||
setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *) &on, sizeof(on)) ||
bind(sock, &sa->sa, sa->sa.sa_family == AF_INET ?
sizeof(sa->sin) : sizeof(sa->sa)) != 0 ||
listen(sock, SOMAXCONN) != 0) {
closesocket(sock);
sock = INVALID_SOCKET;
}
return sock;
}
static char *mg_strdup(const char *str) {
char *copy = (char *) malloc(strlen(str) + 1);
if (copy != NULL) {
strcpy(copy, str);
}
return copy;
}
static int isbyte(int n) {
return n >= 0 && n <= 255;
}
static int parse_net(const char *spec, uint32_t *net, uint32_t *mask) {
int n, a, b, c, d, slash = 32, len = 0;
if ((sscanf(spec, "%d.%d.%d.%d/%d%n", &a, &b, &c, &d, &slash, &n) == 5 ||
sscanf(spec, "%d.%d.%d.%d%n", &a, &b, &c, &d, &n) == 4) &&
isbyte(a) && isbyte(b) && isbyte(c) && isbyte(d) &&
slash >= 0 && slash < 33) {
len = n;
*net = ((uint32_t)a << 24) | ((uint32_t)b << 16) | ((uint32_t)c << 8) | d;
*mask = slash ? 0xffffffffU << (32 - slash) : 0;
}
return len;
}
// Verify given socket address against the ACL.
// Return -1 if ACL is malformed, 0 if address is disallowed, 1 if allowed.
static int check_acl(const char *acl, uint32_t remote_ip) {
int allowed, flag;
uint32_t net, mask;
struct vec vec;
// If any ACL is set, deny by default
allowed = acl == NULL ? '+' : '-';
while ((acl = next_option(acl, &vec, NULL)) != NULL) {
flag = vec.ptr[0];
if ((flag != '+' && flag != '-') ||
parse_net(&vec.ptr[1], &net, &mask) == 0) {
return -1;
}
if (net == (remote_ip & mask)) {
allowed = flag;
}
}
return allowed == '+';
}
static void sockaddr_to_string(char *buf, size_t len,
const union socket_address *usa) {
buf[0] = '\0';
#if defined(USE_IPV6)
inet_ntop(usa->sa.sa_family, usa->sa.sa_family == AF_INET ?
(void *) &usa->sin.sin_addr :
(void *) &usa->sin6.sin6_addr, buf, len);
#elif defined(_WIN32)
// Only Windoze Vista (and newer) have inet_ntop()
strncpy(buf, inet_ntoa(usa->sin.sin_addr), len);
#else
inet_ntop(usa->sa.sa_family, (void *) &usa->sin.sin_addr, buf, len);
#endif
}
static struct connection *accept_new_connection(struct mg_server *server) {
union socket_address sa;
socklen_t len = sizeof(sa);
sock_t sock = INVALID_SOCKET;
struct connection *conn = NULL;
// NOTE(lsm): on Windows, sock is always > FD_SETSIZE
if ((sock = accept(server->listening_sock, &sa.sa, &len)) == INVALID_SOCKET) {
} else if (!check_acl(server->config_options[ACCESS_CONTROL_LIST],
ntohl(* (uint32_t *) &sa.sin.sin_addr))) {
// NOTE(lsm): check_acl doesn't work for IPv6
closesocket(sock);
} else if ((conn = (struct connection *) calloc(1, sizeof(*conn))) == NULL) {
closesocket(sock);
#ifdef USE_SSL
} else if (server->ssl_ctx != NULL &&
((conn->ssl = SSL_new(server->ssl_ctx)) == NULL ||
SSL_set_fd(conn->ssl, sock) != 1)) {
DBG(("SSL error"));
closesocket(sock);
free(conn);
conn = NULL;
#endif
} else {
set_close_on_exec(sock);
set_non_blocking_mode(sock);
conn->server = server;
conn->client_sock = sock;
sockaddr_to_string(conn->mg_conn.remote_ip,
sizeof(conn->mg_conn.remote_ip), &sa);
conn->mg_conn.remote_port = ntohs(sa.sin.sin_port);
conn->mg_conn.server_param = server->server_data;
LINKED_LIST_ADD_TO_FRONT(&server->active_connections, &conn->link);
DBG(("added conn %p", conn));
}
return conn;
}
static void close_conn(struct connection *conn) {
DBG(("%p %d %d", conn, conn->flags, conn->endpoint_type));
LINKED_LIST_REMOVE(&conn->link);
closesocket(conn->client_sock);
free(conn->request); // It's OK to free(NULL), ditto below
free(conn->path_info);
free(conn->remote_iobuf.buf);
free(conn->local_iobuf.buf);
#ifdef USE_SSL
if (conn->ssl != NULL) SSL_free(conn->ssl);
#endif
free(conn);
}
// Protect against directory disclosure attack by removing '..',
// excessive '/' and '\' characters
static void remove_double_dots_and_double_slashes(char *s) {
char *p = s;
while (*s != '\0') {
*p++ = *s++;
if (s[-1] == '/' || s[-1] == '\\') {
// Skip all following slashes, backslashes and double-dots
while (s[0] != '\0') {
if (s[0] == '/' || s[0] == '\\') { s++; }
else if (s[0] == '.' && s[1] == '.') { s += 2; }
else { break; }
}
}
}
*p = '\0';
}
int mg_url_decode(const char *src, int src_len, char *dst,
int dst_len, int is_form_url_encoded) {
int i, j, a, b;
#define HEXTOI(x) (isdigit(x) ? x - '0' : x - 'W')
for (i = j = 0; i < src_len && j < dst_len - 1; i++, j++) {
if (src[i] == '%' && i < src_len - 2 &&
isxdigit(* (const unsigned char *) (src + i + 1)) &&
isxdigit(* (const unsigned char *) (src + i + 2))) {
a = tolower(* (const unsigned char *) (src + i + 1));
b = tolower(* (const unsigned char *) (src + i + 2));
dst[j] = (char) ((HEXTOI(a) << 4) | HEXTOI(b));
i += 2;
} else if (is_form_url_encoded && src[i] == '+') {
dst[j] = ' ';
} else {
dst[j] = src[i];
}
}
dst[j] = '\0'; // Null-terminate the destination
return i >= src_len ? j : -1;
}
static int is_valid_http_method(const char *method) {
return !strcmp(method, "GET") || !strcmp(method, "POST") ||
!strcmp(method, "HEAD") || !strcmp(method, "CONNECT") ||
!strcmp(method, "PUT") || !strcmp(method, "DELETE") ||
!strcmp(method, "OPTIONS") || !strcmp(method, "PROPFIND")
|| !strcmp(method, "MKCOL");
}
// Parse HTTP request, fill in mg_request structure.
// This function modifies the buffer by NUL-terminating
// HTTP request components, header names and header values.
// Note that len must point to the last \n of HTTP headers.
static int parse_http_message(char *buf, int len, struct mg_connection *ri) {
int is_request, n;
// Reset the connection. Make sure that we don't touch fields that are
// set elsewhere: remote_ip, remote_port, server_param
ri->request_method = ri->uri = ri->http_version = ri->query_string = NULL;
ri->num_headers = ri->status_code = ri->is_websocket = ri->content_len = 0;
buf[len - 1] = '\0';
// RFC says that all initial whitespaces should be ingored
while (*buf != '\0' && isspace(* (unsigned char *) buf)) {
buf++;
}
ri->request_method = skip(&buf, " ");
ri->uri = skip(&buf, " ");
ri->http_version = skip(&buf, "\r\n");
// HTTP message could be either HTTP request or HTTP response, e.g.
// "GET / HTTP/1.0 ...." or "HTTP/1.0 200 OK ..."
is_request = is_valid_http_method(ri->request_method);
if ((is_request && memcmp(ri->http_version, "HTTP/", 5) != 0) ||
(!is_request && memcmp(ri->request_method, "HTTP/", 5) != 0)) {
len = -1;
} else {
if (is_request) {
ri->http_version += 5;
}
parse_http_headers(&buf, ri);
if ((ri->query_string = strchr(ri->uri, '?')) != NULL) {
*(char *) ri->query_string++ = '\0';
}
n = (int) strlen(ri->uri);
mg_url_decode(ri->uri, n, (char *) ri->uri, n + 1, 0);
remove_double_dots_and_double_slashes((char *) ri->uri);
}
return len;
}
static int lowercase(const char *s) {
return tolower(* (const unsigned char *) s);
}
static int mg_strcasecmp(const char *s1, const char *s2) {
int diff;
do {
diff = lowercase(s1++) - lowercase(s2++);
} while (diff == 0 && s1[-1] != '\0');
return diff;
}
static int mg_strncasecmp(const char *s1, const char *s2, size_t len) {
int diff = 0;
if (len > 0)
do {
diff = lowercase(s1++) - lowercase(s2++);
} while (diff == 0 && s1[-1] != '\0' && --len > 0);
return diff;
}
// Return HTTP header value, or NULL if not found.
const char *mg_get_header(const struct mg_connection *ri, const char *s) {
int i;
for (i = 0; i < ri->num_headers; i++)
if (!mg_strcasecmp(s, ri->http_headers[i].name))
return ri->http_headers[i].value;
return NULL;
}
#ifndef NO_FILESYSTEM
// Perform case-insensitive match of string against pattern
static int match_prefix(const char *pattern, int pattern_len, const char *str) {
const char *or_str;
int i, j, len, res;
if ((or_str = (const char *) memchr(pattern, '|', pattern_len)) != NULL) {
res = match_prefix(pattern, or_str - pattern, str);
return res > 0 ? res :
match_prefix(or_str + 1, (pattern + pattern_len) - (or_str + 1), str);
}
i = j = 0;
res = -1;
for (; i < pattern_len; i++, j++) {
if (pattern[i] == '?' && str[j] != '\0') {
continue;
} else if (pattern[i] == '$') {
return str[j] == '\0' ? j : -1;
} else if (pattern[i] == '*') {
i++;
if (pattern[i] == '*') {
i++;
len = (int) strlen(str + j);
} else {
len = (int) strcspn(str + j, "/");
}
if (i == pattern_len) {
return j + len;
}
do {
res = match_prefix(pattern + i, pattern_len - i, str + j + len);
} while (res == -1 && len-- > 0);
return res == -1 ? -1 : j + res + len;
} else if (lowercase(&pattern[i]) != lowercase(&str[j])) {
return -1;
}
}
return j;
}
// Return 1 if real file has been found, 0 otherwise
static int convert_uri_to_file_name(struct connection *conn, char *buf,
size_t buf_len, file_stat_t *st) {
struct vec a, b;
const char *rewrites = conn->server->config_options[URL_REWRITES],
*root = conn->server->config_options[DOCUMENT_ROOT],
*cgi_pat = conn->server->config_options[CGI_PATTERN],
*uri = conn->mg_conn.uri;
char *p;
int match_len;
// No filesystem access
if (root == NULL) return 0;
// Handle URL rewrites
mg_snprintf(buf, buf_len, "%s%s", root, uri);
while ((rewrites = next_option(rewrites, &a, &b)) != NULL) {
if ((match_len = match_prefix(a.ptr, a.len, uri)) > 0) {
mg_snprintf(buf, buf_len, "%.*s%s", (int) b.len, b.ptr, uri + match_len);
break;
}
}
if (stat(buf, st) == 0) return 1;
#ifndef NO_CGI
// Support PATH_INFO for CGI scripts.
for (p = buf + strlen(root) + 2; *p != '\0'; p++) {
if (*p == '/') {
*p = '\0';
if (match_prefix(cgi_pat, strlen(cgi_pat), buf) > 0 && !stat(buf, st)) {
DBG(("!!!! [%s]", buf));
*p = '/';
conn->path_info = mg_strdup(p);
*p = '\0';
return 1;
}
*p = '/';
}
}
#endif
return 0;
}
#endif // NO_FILESYSTEM
static int should_keep_alive(const struct mg_connection *conn) {
const char *method = conn->request_method;
const char *http_version = conn->http_version;
const char *header = mg_get_header(conn, "Connection");
return method != NULL && !strcmp(method, "GET") &&
((header != NULL && !mg_strcasecmp(header, "keep-alive")) ||
(header == NULL && http_version && !strcmp(http_version, "1.1")));
}
int mg_write(struct mg_connection *c, const void *buf, int len) {
return spool(&((struct connection *) c)->remote_iobuf, buf, len);
}
void mg_send_status(struct mg_connection *c, int status) {
if (c->status_code == 0) {
c->status_code = status;
mg_printf(c, "HTTP/1.1 %d %s\r\n", status, status_code_to_str(status));
}
}
void mg_send_header(struct mg_connection *c, const char *name, const char *v) {
if (c->status_code == 0) {
c->status_code = 200;
mg_printf(c, "HTTP/1.1 %d %s\r\n", 200, status_code_to_str(200));
}
mg_printf(c, "%s: %s\r\n", name, v);
}
static void terminate_headers(struct mg_connection *c) {
struct connection *conn = (struct connection *) c;
if (!(conn->flags & CONN_HEADERS_SENT)) {
mg_send_header(c, "Transfer-Encoding", "chunked");
mg_write(c, "\r\n", 2);
conn->flags |= CONN_HEADERS_SENT;
}
}
void mg_send_data(struct mg_connection *c, const void *data, int data_len) {
terminate_headers(c);
write_chunk((struct connection *) c, data, data_len);
}
void mg_printf_data(struct mg_connection *c, const char *fmt, ...) {
va_list ap;
terminate_headers(c);
va_start(ap, fmt);
mg_vprintf(c, fmt, ap, 1);
va_end(ap);
}
#if !defined(NO_WEBSOCKET) || !defined(NO_AUTH)
static int is_big_endian(void) {
static const int n = 1;
return ((char *) &n)[0] == 0;
}
#endif
#ifndef NO_WEBSOCKET
// START OF SHA-1 code
// Copyright(c) By Steve Reid <steve@edmweb.com>
#define SHA1HANDSOFF
#if defined(__sun)
#include "solarisfixes.h"
#endif
union char64long16 { unsigned char c[64]; uint32_t l[16]; };
#define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
static uint32_t blk0(union char64long16 *block, int i) {
// Forrest: SHA expect BIG_ENDIAN, swap if LITTLE_ENDIAN
if (!is_big_endian()) {
block->l[i] = (rol(block->l[i], 24) & 0xFF00FF00) |
(rol(block->l[i], 8) & 0x00FF00FF);
}
return block->l[i];
}
#define blk(i) (block->l[i&15] = rol(block->l[(i+13)&15]^block->l[(i+8)&15] \
^block->l[(i+2)&15]^block->l[i&15],1))
#define R0(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk0(block, i)+0x5A827999+rol(v,5);w=rol(w,30);
#define R1(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk(i)+0x5A827999+rol(v,5);w=rol(w,30);
#define R2(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0x6ED9EBA1+rol(v,5);w=rol(w,30);
#define R3(v,w,x,y,z,i) z+=(((w|x)&y)|(w&x))+blk(i)+0x8F1BBCDC+rol(v,5);w=rol(w,30);
#define R4(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0xCA62C1D6+rol(v,5);w=rol(w,30);
typedef struct {
uint32_t state[5];
uint32_t count[2];
unsigned char buffer[64];
} SHA1_CTX;
static void SHA1Transform(uint32_t state[5], const unsigned char buffer[64]) {
uint32_t a, b, c, d, e;
union char64long16 block[1];
memcpy(block, buffer, 64);
a = state[0];
b = state[1];
c = state[2];
d = state[3];
e = state[4];
R0(a,b,c,d,e, 0); R0(e,a,b,c,d, 1); R0(d,e,a,b,c, 2); R0(c,d,e,a,b, 3);
R0(b,c,d,e,a, 4); R0(a,b,c,d,e, 5); R0(e,a,b,c,d, 6); R0(d,e,a,b,c, 7);
R0(c,d,e,a,b, 8); R0(b,c,d,e,a, 9); R0(a,b,c,d,e,10); R0(e,a,b,c,d,11);
R0(d,e,a,b,c,12); R0(c,d,e,a,b,13); R0(b,c,d,e,a,14); R0(a,b,c,d,e,15);
R1(e,a,b,c,d,16); R1(d,e,a,b,c,17); R1(c,d,e,a,b,18); R1(b,c,d,e,a,19);
R2(a,b,c,d,e,20); R2(e,a,b,c,d,21); R2(d,e,a,b,c,22); R2(c,d,e,a,b,23);
R2(b,c,d,e,a,24); R2(a,b,c,d,e,25); R2(e,a,b,c,d,26); R2(d,e,a,b,c,27);
R2(c,d,e,a,b,28); R2(b,c,d,e,a,29); R2(a,b,c,d,e,30); R2(e,a,b,c,d,31);
R2(d,e,a,b,c,32); R2(c,d,e,a,b,33); R2(b,c,d,e,a,34); R2(a,b,c,d,e,35);
R2(e,a,b,c,d,36); R2(d,e,a,b,c,37); R2(c,d,e,a,b,38); R2(b,c,d,e,a,39);
R3(a,b,c,d,e,40); R3(e,a,b,c,d,41); R3(d,e,a,b,c,42); R3(c,d,e,a,b,43);
R3(b,c,d,e,a,44); R3(a,b,c,d,e,45); R3(e,a,b,c,d,46); R3(d,e,a,b,c,47);
R3(c,d,e,a,b,48); R3(b,c,d,e,a,49); R3(a,b,c,d,e,50); R3(e,a,b,c,d,51);
R3(d,e,a,b,c,52); R3(c,d,e,a,b,53); R3(b,c,d,e,a,54); R3(a,b,c,d,e,55);
R3(e,a,b,c,d,56); R3(d,e,a,b,c,57); R3(c,d,e,a,b,58); R3(b,c,d,e,a,59);
R4(a,b,c,d,e,60); R4(e,a,b,c,d,61); R4(d,e,a,b,c,62); R4(c,d,e,a,b,63);
R4(b,c,d,e,a,64); R4(a,b,c,d,e,65); R4(e,a,b,c,d,66); R4(d,e,a,b,c,67);
R4(c,d,e,a,b,68); R4(b,c,d,e,a,69); R4(a,b,c,d,e,70); R4(e,a,b,c,d,71);
R4(d,e,a,b,c,72); R4(c,d,e,a,b,73); R4(b,c,d,e,a,74); R4(a,b,c,d,e,75);
R4(e,a,b,c,d,76); R4(d,e,a,b,c,77); R4(c,d,e,a,b,78); R4(b,c,d,e,a,79);
state[0] += a;
state[1] += b;
state[2] += c;
state[3] += d;
state[4] += e;
// Erase working structures. The order of operations is important,
// used to ensure that compiler doesn't optimize those out.
memset(block, 0, sizeof(block));
a = b = c = d = e = block[0].l[0];
}
static void SHA1Init(SHA1_CTX* context) {
context->state[0] = 0x67452301;
context->state[1] = 0xEFCDAB89;
context->state[2] = 0x98BADCFE;
context->state[3] = 0x10325476;
context->state[4] = 0xC3D2E1F0;
context->count[0] = context->count[1] = 0;
}
static void SHA1Update(SHA1_CTX* context, const unsigned char* data,
uint32_t len) {
uint32_t i, j;
j = context->count[0];
if ((context->count[0] += len << 3) < j)
context->count[1]++;
context->count[1] += (len>>29);
j = (j >> 3) & 63;
if ((j + len) > 63) {
memcpy(&context->buffer[j], data, (i = 64-j));
SHA1Transform(context->state, context->buffer);
for ( ; i + 63 < len; i += 64) {
SHA1Transform(context->state, &data[i]);
}
j = 0;
}
else i = 0;
memcpy(&context->buffer[j], &data[i], len - i);
}
static void SHA1Final(unsigned char digest[20], SHA1_CTX* context) {
unsigned i;
unsigned char finalcount[8], c;
for (i = 0; i < 8; i++) {
finalcount[i] = (unsigned char)((context->count[(i >= 4 ? 0 : 1)]
>> ((3-(i & 3)) * 8) ) & 255);
}
c = 0200;
SHA1Update(context, &c, 1);
while ((context->count[0] & 504) != 448) {
c = 0000;
SHA1Update(context, &c, 1);
}
SHA1Update(context, finalcount, 8);
for (i = 0; i < 20; i++) {
digest[i] = (unsigned char)
((context->state[i>>2] >> ((3-(i & 3)) * 8) ) & 255);
}
memset(context, '\0', sizeof(*context));
memset(&finalcount, '\0', sizeof(finalcount));
}
// END OF SHA1 CODE
static void base64_encode(const unsigned char *src, int src_len, char *dst) {
static const char *b64 =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
int i, j, a, b, c;
for (i = j = 0; i < src_len; i += 3) {
a = src[i];
b = i + 1 >= src_len ? 0 : src[i + 1];
c = i + 2 >= src_len ? 0 : src[i + 2];
dst[j++] = b64[a >> 2];
dst[j++] = b64[((a & 3) << 4) | (b >> 4)];
if (i + 1 < src_len) {
dst[j++] = b64[(b & 15) << 2 | (c >> 6)];
}
if (i + 2 < src_len) {
dst[j++] = b64[c & 63];
}
}
while (j % 4 != 0) {
dst[j++] = '=';
}
dst[j++] = '\0';
}
static void send_websocket_handshake(struct mg_connection *conn,
const char *key) {
static const char *magic = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
char buf[500], sha[20], b64_sha[sizeof(sha) * 2];
SHA1_CTX sha_ctx;
mg_snprintf(buf, sizeof(buf), "%s%s", key, magic);
SHA1Init(&sha_ctx);
SHA1Update(&sha_ctx, (unsigned char *) buf, strlen(buf));
SHA1Final((unsigned char *) sha, &sha_ctx);
base64_encode((unsigned char *) sha, sizeof(sha), b64_sha);
mg_snprintf(buf, sizeof(buf), "%s%s%s",
"HTTP/1.1 101 Switching Protocols\r\n"
"Upgrade: websocket\r\n"
"Connection: Upgrade\r\n"
"Sec-WebSocket-Accept: ", b64_sha, "\r\n\r\n");
mg_write(conn, buf, strlen(buf));
}
static int deliver_websocket_frame(struct connection *conn) {
// Having buf unsigned char * is important, as it is used below in arithmetic
unsigned char *buf = (unsigned char *) conn->local_iobuf.buf;
int i, len, buf_len = conn->local_iobuf.len, frame_len = 0,
mask_len = 0, header_len = 0, data_len = 0, buffered = 0;
if (buf_len >= 2) {
len = buf[1] & 127;
mask_len = buf[1] & 128 ? 4 : 0;
if (len < 126 && buf_len >= mask_len) {
data_len = len;
header_len = 2 + mask_len;
} else if (len == 126 && buf_len >= 4 + mask_len) {
header_len = 4 + mask_len;
data_len = ((((int) buf[2]) << 8) + buf[3]);
} else if (buf_len >= 10 + mask_len) {
header_len = 10 + mask_len;
data_len = (int) (((uint64_t) htonl(* (uint32_t *) &buf[2])) << 32) +
htonl(* (uint32_t *) &buf[6]);
}
}
frame_len = header_len + data_len;
buffered = frame_len > 0 && frame_len <= buf_len;
if (buffered) {
conn->mg_conn.content_len = data_len;
conn->mg_conn.content = (char *) buf + header_len;
conn->mg_conn.wsbits = buf[0];
// Apply mask if necessary
if (mask_len > 0) {
for (i = 0; i < data_len; i++) {
buf[i + header_len] ^= (buf + header_len - mask_len)[i % 4];
}
}
// Call the handler and remove frame from the iobuf
if (conn->endpoint.uh->handler(&conn->mg_conn)) {
conn->flags |= CONN_SPOOL_DONE;
}
memmove(buf, buf + frame_len, buf_len - frame_len);
conn->local_iobuf.len -= frame_len;
}
return buffered;
}
int mg_websocket_write(struct mg_connection* conn, int opcode,
const char *data, size_t data_len) {
unsigned char *copy;
size_t copy_len = 0;
int retval = -1;
if ((copy = (unsigned char *) malloc(data_len + 10)) == NULL) {
return -1;
}
copy[0] = 0x80 + (opcode & 0x0f);
// Frame format: http://tools.ietf.org/html/rfc6455#section-5.2
if (data_len < 126) {
// Inline 7-bit length field
copy[1] = data_len;
memcpy(copy + 2, data, data_len);
copy_len = 2 + data_len;
} else if (data_len <= 0xFFFF) {
// 16-bit length field
copy[1] = 126;
* (uint16_t *) (copy + 2) = (uint16_t) htons((uint16_t) data_len);
memcpy(copy + 4, data, data_len);
copy_len = 4 + data_len;
} else {
// 64-bit length field
copy[1] = 127;
* (uint32_t *) (copy + 2) = (uint32_t)
htonl((uint32_t) ((uint64_t) data_len >> 32));
* (uint32_t *) (copy + 6) = (uint32_t) htonl(data_len & 0xffffffff);
memcpy(copy + 10, data, data_len);
copy_len = 10 + data_len;
}
if (copy_len > 0) {
retval = mg_write(conn, copy, copy_len);
}
free(copy);
return retval;
}
static void send_websocket_handshake_if_requested(struct mg_connection *conn) {
const char *ver = mg_get_header(conn, "Sec-WebSocket-Version"),
*key = mg_get_header(conn, "Sec-WebSocket-Key");
if (ver != NULL && key != NULL) {
conn->is_websocket = 1;
send_websocket_handshake(conn, key);
}
}
static void ping_idle_websocket_connection(struct connection *conn, time_t t) {
if (t - conn->last_activity_time > USE_WEBSOCKET_PING_INTERVAL) {
mg_websocket_write(&conn->mg_conn, 0x9, "", 0);
}
}
#else
#define ping_idle_websocket_connection(conn, t)
#endif // !NO_WEBSOCKET
static void write_to_client(struct connection *conn) {
struct iobuf *io = &conn->remote_iobuf;
int n = conn->ssl == NULL ? send(conn->client_sock, io->buf, io->len, 0) :
#ifdef USE_SSL
SSL_write(conn->ssl, io->buf, io->len);
#else
0;
#endif
DBG(("%p Written %d of %d(%d): [%.*s ...]",
conn, n, io->len, io->size, 40, io->buf));
if (is_error(n)) {
conn->flags |= CONN_CLOSE;
} else if (n > 0) {
memmove(io->buf, io->buf + n, io->len - n);
io->len -= n;
conn->num_bytes_sent += n;
}
if (io->len == 0 && conn->flags & CONN_SPOOL_DONE) {
conn->flags |= CONN_CLOSE;
}
}
const char *mg_get_mime_type(const char *path) {
const char *ext;
size_t i, path_len;
path_len = strlen(path);
for (i = 0; static_builtin_mime_types[i].extension != NULL; i++) {
ext = path + (path_len - static_builtin_mime_types[i].ext_len);
if (path_len > static_builtin_mime_types[i].ext_len &&
mg_strcasecmp(ext, static_builtin_mime_types[i].extension) == 0) {
return static_builtin_mime_types[i].mime_type;
}
}
return "text/plain";
}
static struct uri_handler *find_uri_handler(struct mg_server *server,
const char *uri) {
struct ll *lp, *tmp;
struct uri_handler *uh;
LINKED_LIST_FOREACH(&server->uri_handlers, lp, tmp) {
uh = LINKED_LIST_ENTRY(lp, struct uri_handler, link);
if (!strncmp(uh->uri, uri, strlen(uh->uri))) return uh;
}
return NULL;
}
#ifndef NO_FILESYSTEM
// Convert month to the month number. Return -1 on error, or month number
static int get_month_index(const char *s) {
static const char *month_names[] = {
"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
};
int i;
for (i = 0; i < (int) ARRAY_SIZE(month_names); i++)
if (!strcmp(s, month_names[i]))
return i;
return -1;
}
static int num_leap_years(int year) {
return year / 4 - year / 100 + year / 400;
}
// Parse UTC date-time string, and return the corresponding time_t value.
static time_t parse_date_string(const char *datetime) {
static const unsigned short days_before_month[] = {
0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334
};
char month_str[32];
int second, minute, hour, day, month, year, leap_days, days;
time_t result = (time_t) 0;
if (((sscanf(datetime, "%d/%3s/%d %d:%d:%d",
&day, month_str, &year, &hour, &minute, &second) == 6) ||
(sscanf(datetime, "%d %3s %d %d:%d:%d",
&day, month_str, &year, &hour, &minute, &second) == 6) ||
(sscanf(datetime, "%*3s, %d %3s %d %d:%d:%d",
&day, month_str, &year, &hour, &minute, &second) == 6) ||
(sscanf(datetime, "%d-%3s-%d %d:%d:%d",
&day, month_str, &year, &hour, &minute, &second) == 6)) &&
year > 1970 &&
(month = get_month_index(month_str)) != -1) {
leap_days = num_leap_years(year) - num_leap_years(1970);
year -= 1970;
days = year * 365 + days_before_month[month] + (day - 1) + leap_days;
result = days * 24 * 3600 + hour * 3600 + minute * 60 + second;
}
return result;
}
// Look at the "path" extension and figure what mime type it has.
// Store mime type in the vector.
static void get_mime_type(const struct mg_server *server, const char *path,
struct vec *vec) {
struct vec ext_vec, mime_vec;
const char *list, *ext;
size_t path_len;
path_len = strlen(path);
// Scan user-defined mime types first, in case user wants to
// override default mime types.
list = server->config_options[EXTRA_MIME_TYPES];
while ((list = next_option(list, &ext_vec, &mime_vec)) != NULL) {
// ext now points to the path suffix
ext = path + path_len - ext_vec.len;
if (mg_strncasecmp(ext, ext_vec.ptr, ext_vec.len) == 0) {
*vec = mime_vec;
return;
}
}
vec->ptr = mg_get_mime_type(path);
vec->len = strlen(vec->ptr);
}
static const char *suggest_connection_header(const struct mg_connection *conn) {
return should_keep_alive(conn) ? "keep-alive" : "close";
}
static void construct_etag(char *buf, size_t buf_len, const file_stat_t *st) {
mg_snprintf(buf, buf_len, "\"%lx.%" INT64_FMT "\"",
(unsigned long) st->st_mtime, (int64_t) st->st_size);
}
// Return True if we should reply 304 Not Modified.
static int is_not_modified(const struct connection *conn,
const file_stat_t *stp) {
char etag[64];
const char *ims = mg_get_header(&conn->mg_conn, "If-Modified-Since");
const char *inm = mg_get_header(&conn->mg_conn, "If-None-Match");
construct_etag(etag, sizeof(etag), stp);
return (inm != NULL && !mg_strcasecmp(etag, inm)) ||
(ims != NULL && stp->st_mtime <= parse_date_string(ims));
}
// For given directory path, substitute it to valid index file.
// Return 0 if index file has been found, -1 if not found.
// If the file is found, it's stats is returned in stp.
static int find_index_file(struct connection *conn, char *path,
size_t path_len, file_stat_t *stp) {
const char *list = conn->server->config_options[INDEX_FILES];
file_stat_t st;
struct vec filename_vec;
size_t n = strlen(path), found = 0;
// The 'path' given to us points to the directory. Remove all trailing
// directory separator characters from the end of the path, and
// then append single directory separator character.
while (n > 0 && path[n - 1] == '/') {
n--;
}
path[n] = '/';
// Traverse index files list. For each entry, append it to the given
// path and see if the file exists. If it exists, break the loop
while ((list = next_option(list, &filename_vec, NULL)) != NULL) {
// Ignore too long entries that may overflow path buffer
if (filename_vec.len > (int) (path_len - (n + 2)))
continue;
// Prepare full path to the index file
strncpy(path + n + 1, filename_vec.ptr, filename_vec.len);
path[n + 1 + filename_vec.len] = '\0';
//DBG(("[%s]", path));
// Does it exist?
if (!stat(path, &st)) {
// Yes it does, break the loop
*stp = st;
found = 1;
break;
}
}
// If no index file exists, restore directory path
if (!found) {
path[n] = '\0';
}
return found;
}
static int parse_range_header(const char *header, int64_t *a, int64_t *b) {
return sscanf(header, "bytes=%" INT64_FMT "-%" INT64_FMT, a, b);
}
static void gmt_time_string(char *buf, size_t buf_len, time_t *t) {
strftime(buf, buf_len, "%a, %d %b %Y %H:%M:%S GMT", gmtime(t));
}
static void open_file_endpoint(struct connection *conn, const char *path,
file_stat_t *st) {
char date[64], lm[64], etag[64], range[64], headers[500];
const char *msg = "OK", *hdr;
time_t curtime = time(NULL);
int64_t r1, r2;
struct vec mime_vec;
int n;
conn->endpoint_type = EP_FILE;
set_close_on_exec(conn->endpoint.fd);
conn->mg_conn.status_code = 200;
get_mime_type(conn->server, path, &mime_vec);
conn->cl = st->st_size;
range[0] = '\0';
// If Range: header specified, act accordingly
r1 = r2 = 0;
hdr = mg_get_header(&conn->mg_conn, "Range");
if (hdr != NULL && (n = parse_range_header(hdr, &r1, &r2)) > 0 &&
r1 >= 0 && r2 >= 0) {
conn->mg_conn.status_code = 206;
conn->cl = n == 2 ? (r2 > conn->cl ? conn->cl : r2) - r1 + 1: conn->cl - r1;
mg_snprintf(range, sizeof(range), "Content-Range: bytes "
"%" INT64_FMT "-%" INT64_FMT "/%" INT64_FMT "\r\n",
r1, r1 + conn->cl - 1, (int64_t) st->st_size);
msg = "Partial Content";
lseek(conn->endpoint.fd, r1, SEEK_SET);
}
// Prepare Etag, Date, Last-Modified headers. Must be in UTC, according to
// http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.3
gmt_time_string(date, sizeof(date), &curtime);
gmt_time_string(lm, sizeof(lm), &st->st_mtime);
construct_etag(etag, sizeof(etag), st);
n = mg_snprintf(headers, sizeof(headers),
"HTTP/1.1 %d %s\r\n"
"Date: %s\r\n"
"Last-Modified: %s\r\n"
"Etag: %s\r\n"
"Content-Type: %.*s\r\n"
"Content-Length: %" INT64_FMT "\r\n"
"Connection: %s\r\n"
"Accept-Ranges: bytes\r\n"
"%s%s\r\n",
conn->mg_conn.status_code, msg, date, lm, etag,
(int) mime_vec.len, mime_vec.ptr, conn->cl,
suggest_connection_header(&conn->mg_conn),
range, USE_EXTRA_HTTP_HEADERS);
spool(&conn->remote_iobuf, headers, n);
if (!strcmp(conn->mg_conn.request_method, "HEAD")) {
conn->flags |= CONN_SPOOL_DONE;
close(conn->endpoint.fd);
conn->endpoint_type = EP_NONE;
}
}
#endif // NO_FILESYSTEM
static void write_terminating_chunk(struct connection *conn) {
mg_write(&conn->mg_conn, "0\r\n\r\n", 5);
}
static void call_uri_handler_if_data_is_buffered(struct connection *conn) {
struct iobuf *loc = &conn->local_iobuf;
struct mg_connection *c = &conn->mg_conn;
c->content = loc->buf;
#ifndef NO_WEBSOCKET
if (conn->mg_conn.is_websocket) {
do { } while (deliver_websocket_frame(conn));
} else
#endif
if (loc->len >= c->content_len) {
conn->endpoint.uh->handler(c);
if (conn->flags & CONN_HEADERS_SENT) {
write_terminating_chunk(conn);
}
close_local_endpoint(conn);
}
}
#if !defined(NO_DIRECTORY_LISTING) || !defined(NO_DAV)
#ifdef _WIN32
struct dirent {
char d_name[MAX_PATH_SIZE];
};
typedef struct DIR {
HANDLE handle;
WIN32_FIND_DATAW info;
struct dirent result;
} DIR;
// Implementation of POSIX opendir/closedir/readdir for Windows.
static DIR *opendir(const char *name) {
DIR *dir = NULL;
wchar_t wpath[MAX_PATH_SIZE];
DWORD attrs;
if (name == NULL) {
SetLastError(ERROR_BAD_ARGUMENTS);
} else if ((dir = (DIR *) malloc(sizeof(*dir))) == NULL) {
SetLastError(ERROR_NOT_ENOUGH_MEMORY);
} else {
to_unicode(name, wpath, ARRAY_SIZE(wpath));
attrs = GetFileAttributesW(wpath);
if (attrs != 0xFFFFFFFF &&
((attrs & FILE_ATTRIBUTE_DIRECTORY) == FILE_ATTRIBUTE_DIRECTORY)) {
(void) wcscat(wpath, L"\\*");
dir->handle = FindFirstFileW(wpath, &dir->info);
dir->result.d_name[0] = '\0';
} else {
free(dir);
dir = NULL;
}
}
return dir;
}
static int closedir(DIR *dir) {
int result = 0;
if (dir != NULL) {
if (dir->handle != INVALID_HANDLE_VALUE)
result = FindClose(dir->handle) ? 0 : -1;
free(dir);
} else {
result = -1;
SetLastError(ERROR_BAD_ARGUMENTS);
}
return result;
}
static struct dirent *readdir(DIR *dir) {
struct dirent *result = 0;
if (dir) {
if (dir->handle != INVALID_HANDLE_VALUE) {
result = &dir->result;
(void) WideCharToMultiByte(CP_UTF8, 0,
dir->info.cFileName, -1, result->d_name,
sizeof(result->d_name), NULL, NULL);
if (!FindNextFileW(dir->handle, &dir->info)) {
(void) FindClose(dir->handle);
dir->handle = INVALID_HANDLE_VALUE;
}
} else {
SetLastError(ERROR_FILE_NOT_FOUND);
}
} else {
SetLastError(ERROR_BAD_ARGUMENTS);
}
return result;
}
#endif // _WIN32 POSIX opendir/closedir/readdir implementation
static int must_hide_file(struct connection *conn, const char *path) {
const char *pw_pattern = "**" PASSWORDS_FILE_NAME "$";
const char *pattern = conn->server->config_options[HIDE_FILES_PATTERN];
return match_prefix(pw_pattern, strlen(pw_pattern), path) > 0 ||
(pattern != NULL && match_prefix(pattern, strlen(pattern), path) > 0);
}
static int scan_directory(struct connection *conn, const char *dir,
struct dir_entry **arr) {
char path[MAX_PATH_SIZE];
struct dir_entry *p;
struct dirent *dp;
int arr_size = 0, arr_ind = 0, inc = 100;
DIR *dirp;
*arr = NULL;
if ((dirp = (opendir(dir))) == NULL) return 0;
while ((dp = readdir(dirp)) != NULL) {
// Do not show current dir and hidden files
if (!strcmp(dp->d_name, ".") ||
!strcmp(dp->d_name, "..") ||
must_hide_file(conn, dp->d_name)) {
continue;
}
mg_snprintf(path, sizeof(path), "%s%c%s", dir, '/', dp->d_name);
// Resize the array if nesessary
if (arr_ind >= arr_size) {
if ((p = (struct dir_entry *)
realloc(*arr, (inc + arr_size) * sizeof(**arr))) != NULL) {
// Memset new chunk to zero, otherwize st_mtime will have garbage which
// can make strftime() segfault, see
// http://code.google.com/p/mongoose/issues/detail?id=79
memset(p + arr_size, 0, sizeof(**arr) * inc);
*arr = p;
arr_size += inc;
}
}
if (arr_ind < arr_size) {
(*arr)[arr_ind].conn = conn;
(*arr)[arr_ind].file_name = strdup(dp->d_name);
stat(path, &(*arr)[arr_ind].st);
arr_ind++;
}
}
closedir(dirp);
return arr_ind;
}
static void mg_url_encode(const char *src, char *dst, size_t dst_len) {
static const char *dont_escape = "._-$,;~()";
static const char *hex = "0123456789abcdef";
const char *end = dst + dst_len - 1;
for (; *src != '\0' && dst < end; src++, dst++) {
if (isalnum(*(const unsigned char *) src) ||
strchr(dont_escape, * (const unsigned char *) src) != NULL) {
*dst = *src;
} else if (dst + 2 < end) {
dst[0] = '%';
dst[1] = hex[(* (const unsigned char *) src) >> 4];
dst[2] = hex[(* (const unsigned char *) src) & 0xf];
dst += 2;
}
}
*dst = '\0';
}
#endif // !NO_DIRECTORY_LISTING || !NO_DAV
#ifndef NO_DIRECTORY_LISTING
static void print_dir_entry(const struct dir_entry *de) {
char size[64], mod[64], href[MAX_PATH_SIZE * 3], chunk[MAX_PATH_SIZE * 4];
int64_t fsize = de->st.st_size;
int is_dir = S_ISDIR(de->st.st_mode), n;
const char *slash = is_dir ? "/" : "";
if (is_dir) {
mg_snprintf(size, sizeof(size), "%s", "[DIRECTORY]");
} else {
// We use (signed) cast below because MSVC 6 compiler cannot
// convert unsigned __int64 to double.
if (fsize < 1024) {
mg_snprintf(size, sizeof(size), "%d", (int) fsize);
} else if (fsize < 0x100000) {
mg_snprintf(size, sizeof(size), "%.1fk", (double) fsize / 1024.0);
} else if (fsize < 0x40000000) {
mg_snprintf(size, sizeof(size), "%.1fM", (double) fsize / 1048576);
} else {
mg_snprintf(size, sizeof(size), "%.1fG", (double) fsize / 1073741824);
}
}
strftime(mod, sizeof(mod), "%d-%b-%Y %H:%M", localtime(&de->st.st_mtime));
mg_url_encode(de->file_name, href, sizeof(href));
n = mg_snprintf(chunk, sizeof(chunk),
"<tr><td><a href=\"%s%s%s\">%s%s</a></td>"
"<td>&nbsp;%s</td><td>&nbsp;&nbsp;%s</td></tr>\n",
de->conn->mg_conn.uri, href, slash, de->file_name, slash,
mod, size);
write_chunk((struct connection *) de->conn, chunk, n);
}
// Sort directory entries by size, or name, or modification time.
// On windows, __cdecl specification is needed in case if project is built
// with __stdcall convention. qsort always requires __cdels callback.
static int __cdecl compare_dir_entries(const void *p1, const void *p2) {
const struct dir_entry *a = (const struct dir_entry *) p1,
*b = (const struct dir_entry *) p2;
const char *qs = a->conn->mg_conn.query_string ?
a->conn->mg_conn.query_string : "na";
int cmp_result = 0;
if (S_ISDIR(a->st.st_mode) && !S_ISDIR(b->st.st_mode)) {
return -1; // Always put directories on top
} else if (!S_ISDIR(a->st.st_mode) && S_ISDIR(b->st.st_mode)) {
return 1; // Always put directories on top
} else if (*qs == 'n') {
cmp_result = strcmp(a->file_name, b->file_name);
} else if (*qs == 's') {
cmp_result = a->st.st_size == b->st.st_size ? 0 :
a->st.st_size > b->st.st_size ? 1 : -1;
} else if (*qs == 'd') {
cmp_result = a->st.st_mtime == b->st.st_mtime ? 0 :
a->st.st_mtime > b->st.st_mtime ? 1 : -1;
}
return qs[1] == 'd' ? -cmp_result : cmp_result;
}
static void send_directory_listing(struct connection *conn, const char *dir) {
char buf[2000];
struct dir_entry *arr = NULL;
int i, num_entries, sort_direction = conn->mg_conn.query_string != NULL &&
conn->mg_conn.query_string[1] == 'd' ? 'a' : 'd';
conn->mg_conn.status_code = 200;
mg_snprintf(buf, sizeof(buf), "%s",
"HTTP/1.1 200 OK\r\n"
"Transfer-Encoding: Chunked\r\n"
"Content-Type: text/html; charset=utf-8\r\n\r\n");
spool(&conn->remote_iobuf, buf, strlen(buf));
mg_snprintf(buf, sizeof(buf),
"<html><head><title>Index of %s</title>"
"<style>th {text-align: left;}</style></head>"
"<body><h1>Index of %s</h1><pre><table cellpadding=\"0\">"
"<tr><th><a href=\"?n%c\">Name</a></th>"
"<th><a href=\"?d%c\">Modified</a></th>"
"<th><a href=\"?s%c\">Size</a></th></tr>"
"<tr><td colspan=\"3\"><hr></td></tr>",
conn->mg_conn.uri, conn->mg_conn.uri,
sort_direction, sort_direction, sort_direction);
write_chunk(conn, buf, strlen(buf));
num_entries = scan_directory(conn, dir, &arr);
qsort(arr, num_entries, sizeof(arr[0]), compare_dir_entries);
for (i = 0; i < num_entries; i++) {
print_dir_entry(&arr[i]);
free(arr[i].file_name);
}
free(arr);
write_terminating_chunk(conn);
close_local_endpoint(conn);
}
#endif // NO_DIRECTORY_LISTING
#ifndef NO_DAV
static void print_props(struct connection *conn, const char *uri,
file_stat_t *stp) {
char mtime[64], buf[MAX_PATH_SIZE + 200];
gmt_time_string(mtime, sizeof(mtime), &stp->st_mtime);
mg_snprintf(buf, sizeof(buf),
"<d:response>"
"<d:href>%s</d:href>"
"<d:propstat>"
"<d:prop>"
"<d:resourcetype>%s</d:resourcetype>"
"<d:getcontentlength>%" INT64_FMT "</d:getcontentlength>"
"<d:getlastmodified>%s</d:getlastmodified>"
"</d:prop>"
"<d:status>HTTP/1.1 200 OK</d:status>"
"</d:propstat>"
"</d:response>\n",
uri, S_ISDIR(stp->st_mode) ? "<d:collection/>" : "",
(int64_t) stp->st_size, mtime);
spool(&conn->remote_iobuf, buf, strlen(buf));
}
static void handle_propfind(struct connection *conn, const char *path,
file_stat_t *stp) {
static const char header[] = "HTTP/1.1 207 Multi-Status\r\n"
"Connection: close\r\n"
"Content-Type: text/xml; charset=utf-8\r\n\r\n"
"<?xml version=\"1.0\" encoding=\"utf-8\"?>"
"<d:multistatus xmlns:d='DAV:'>\n";
static const char footer[] = "</d:multistatus>";
const char *depth = mg_get_header(&conn->mg_conn, "Depth"),
*list_dir = conn->server->config_options[ENABLE_DIRECTORY_LISTING];
conn->mg_conn.status_code = 207;
spool(&conn->remote_iobuf, header, sizeof(header) - 1);
// Print properties for the requested resource itself
print_props(conn, conn->mg_conn.uri, stp);
// If it is a directory, print directory entries too if Depth is not 0
if (S_ISDIR(stp->st_mode) && !mg_strcasecmp(list_dir, "yes") &&
(depth == NULL || strcmp(depth, "0") != 0)) {
struct dir_entry *arr = NULL;
int i, num_entries = scan_directory(conn, path, &arr);
for (i = 0; i < num_entries; i++) {
char buf[MAX_PATH_SIZE], buf2[sizeof(buf) * 3];
struct dir_entry *de = &arr[i];
mg_snprintf(buf, sizeof(buf), "%s%s", de->conn->mg_conn.uri,
de->file_name);
mg_url_encode(buf, buf2, sizeof(buf2) - 1);
print_props(conn, buf, &de->st);
}
}
spool(&conn->remote_iobuf, footer, sizeof(footer) - 1);
close_local_endpoint(conn);
}
static void handle_mkcol(struct connection *conn, const char *path) {
int status_code = 500;
if (conn->mg_conn.content_len > 0) {
status_code = 415;
} else if (!mkdir(path, 0755)) {
status_code = 201;
} else if (errno == EEXIST) {
status_code = 405;
} else if (errno == EACCES) {
status_code = 403;
} else if (errno == ENOENT) {
status_code = 409;
}
send_http_error(conn, status_code, NULL);
}
static int remove_directory(const char *dir) {
char path[MAX_PATH_SIZE];
struct dirent *dp;
file_stat_t st;
DIR *dirp;
if ((dirp = opendir(dir)) == NULL) return 0;
while ((dp = readdir(dirp)) != NULL) {
if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, "..")) continue;
mg_snprintf(path, sizeof(path), "%s%c%s", dir, '/', dp->d_name);
stat(path, &st);
if (S_ISDIR(st.st_mode)) {
remove_directory(path);
} else {
remove(path);
}
}
closedir(dirp);
rmdir(dir);
return 1;
}
static void handle_delete(struct connection *conn, const char *path) {
file_stat_t st;
if (!stat(path, &st)) {
send_http_error(conn, 404, NULL);
} else if (S_ISDIR(st.st_mode)) {
remove_directory(path);
send_http_error(conn, 204, NULL);
} else if (!remove(path) == 0) {
send_http_error(conn, 204, NULL);
} else {
send_http_error(conn, 423, NULL);
}
}
// For a given PUT path, create all intermediate subdirectories
// for given path. Return 0 if the path itself is a directory,
// or -1 on error, 1 if OK.
static int put_dir(const char *path) {
char buf[MAX_PATH_SIZE];
const char *s, *p;
file_stat_t st;
// Create intermediate directories if they do not exist
for (s = p = path + 1; (p = strchr(s, '/')) != NULL; s = ++p) {
if (p - path >= (int) sizeof(buf)) return -1; // Buffer overflow
memcpy(buf, path, p - path);
buf[p - path] = '\0';
if (stat(buf, &st) != 0 && mkdir(buf, 0755) != 0) return -1;
if (p[1] == '\0') return 0; // Path is a directory itself
}
return 1;
}
static void handle_put(struct connection *conn, const char *path) {
file_stat_t st;
const char *range, *cl_hdr = mg_get_header(&conn->mg_conn, "Content-Length");
int64_t r1, r2;
int rc;
conn->mg_conn.status_code = !stat(path, &st) ? 200 : 201;
if ((rc = put_dir(path)) == 0) {
mg_printf(&conn->mg_conn, "HTTP/1.1 %d OK\r\n\r\n",
conn->mg_conn.status_code);
close_local_endpoint(conn);
} else if (rc == -1) {
send_http_error(conn, 500, "put_dir: %s", strerror(errno));
} else if (cl_hdr == NULL) {
send_http_error(conn, 411, NULL);
#ifdef _WIN32
//On Windows, open() is a macro with 2 params
} else if ((conn->endpoint.fd =
open(path, O_RDWR | O_CREAT | O_TRUNC)) < 0) {
#else
} else if ((conn->endpoint.fd =
open(path, O_RDWR | O_CREAT | O_TRUNC, 0644)) < 0) {
#endif
send_http_error(conn, 500, "open(%s): %s", path, strerror(errno));
} else {
DBG(("PUT [%s] %d", path, conn->local_iobuf.len));
conn->endpoint_type = EP_PUT;
set_close_on_exec(conn->endpoint.fd);
range = mg_get_header(&conn->mg_conn, "Content-Range");
conn->cl = to64(cl_hdr);
r1 = r2 = 0;
if (range != NULL && parse_range_header(range, &r1, &r2) > 0) {
conn->mg_conn.status_code = 206;
lseek(conn->endpoint.fd, r1, SEEK_SET);
conn->cl = r2 > r1 ? r2 - r1 + 1: conn->cl - r1;
}
mg_printf(&conn->mg_conn, "HTTP/1.1 %d OK\r\nContent-Length: 0\r\n\r\n",
conn->mg_conn.status_code);
}
}
static void forward_put_data(struct connection *conn) {
struct iobuf *io = &conn->local_iobuf;
int n = write(conn->endpoint.fd, io->buf, io->len);
if (n > 0) {
memmove(io->buf, io->buf + n, io->len - n);
io->len -= n;
conn->cl -= n;
if (conn->cl <= 0) {
close_local_endpoint(conn);
}
}
}
static void send_options(struct connection *conn) {
static const char reply[] = "HTTP/1.1 200 OK\r\nAllow: GET, POST, HEAD, "
"CONNECT, PUT, DELETE, OPTIONS, PROPFIND, MKCOL\r\nDAV: 1\r\n\r\n";
spool(&conn->remote_iobuf, reply, sizeof(reply) - 1);
conn->flags |= CONN_SPOOL_DONE;
}
#endif // NO_DAV
#ifndef NO_AUTH
static void send_authorization_request(struct connection *conn) {
conn->mg_conn.status_code = 401;
mg_printf(&conn->mg_conn,
"HTTP/1.1 401 Unauthorized\r\n"
"WWW-Authenticate: Digest qop=\"auth\", "
"realm=\"%s\", nonce=\"%lu\"\r\n\r\n",
conn->server->config_options[AUTH_DOMAIN],
(unsigned long) time(NULL));
close_local_endpoint(conn);
}
// Use the global passwords file, if specified by auth_gpass option,
// or search for .htpasswd in the requested directory.
static FILE *open_auth_file(struct connection *conn, const char *path) {
char name[MAX_PATH_SIZE];
const char *p, *gpass = conn->server->config_options[GLOBAL_AUTH_FILE];
file_stat_t st;
FILE *fp = NULL;
if (gpass != NULL) {
// Use global passwords file
fp = fopen(gpass, "r");
} else if (!stat(path, &st) && S_ISDIR(st.st_mode)) {
mg_snprintf(name, sizeof(name), "%s%c%s", path, '/', PASSWORDS_FILE_NAME);
fp = fopen(name, "r");
} else {
// Try to find .htpasswd in requested directory.
if ((p = strrchr(path, '/')) == NULL) p = path;
mg_snprintf(name, sizeof(name), "%.*s%c%s",
(int) (p - path), path, '/', PASSWORDS_FILE_NAME);
fp = fopen(name, "r");
}
return fp;
}
#if !defined(HAVE_MD5) && !defined(NO_AUTH)
typedef struct MD5Context {
uint32_t buf[4];
uint32_t bits[2];
unsigned char in[64];
} MD5_CTX;
static void byteReverse(unsigned char *buf, unsigned longs) {
uint32_t t;
// Forrest: MD5 expect LITTLE_ENDIAN, swap if BIG_ENDIAN
if (is_big_endian()) {
do {
t = (uint32_t) ((unsigned) buf[3] << 8 | buf[2]) << 16 |
((unsigned) buf[1] << 8 | buf[0]);
* (uint32_t *) buf = t;
buf += 4;
} while (--longs);
}
}
#define F1(x, y, z) (z ^ (x & (y ^ z)))
#define F2(x, y, z) F1(z, x, y)
#define F3(x, y, z) (x ^ y ^ z)
#define F4(x, y, z) (y ^ (x | ~z))
#define MD5STEP(f, w, x, y, z, data, s) \
( w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x )
// Start MD5 accumulation. Set bit count to 0 and buffer to mysterious
// initialization constants.
static void MD5Init(MD5_CTX *ctx) {
ctx->buf[0] = 0x67452301;
ctx->buf[1] = 0xefcdab89;
ctx->buf[2] = 0x98badcfe;
ctx->buf[3] = 0x10325476;
ctx->bits[0] = 0;
ctx->bits[1] = 0;
}
static void MD5Transform(uint32_t buf[4], uint32_t const in[16]) {
register uint32_t a, b, c, d;
a = buf[0];
b = buf[1];
c = buf[2];
d = buf[3];
MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
buf[0] += a;
buf[1] += b;
buf[2] += c;
buf[3] += d;
}
static void MD5Update(MD5_CTX *ctx, unsigned char const *buf, unsigned len) {
uint32_t t;
t = ctx->bits[0];
if ((ctx->bits[0] = t + ((uint32_t) len << 3)) < t)
ctx->bits[1]++;
ctx->bits[1] += len >> 29;
t = (t >> 3) & 0x3f;
if (t) {
unsigned char *p = (unsigned char *) ctx->in + t;
t = 64 - t;
if (len < t) {
memcpy(p, buf, len);
return;
}
memcpy(p, buf, t);
byteReverse(ctx->in, 16);
MD5Transform(ctx->buf, (uint32_t *) ctx->in);
buf += t;
len -= t;
}
while (len >= 64) {
memcpy(ctx->in, buf, 64);
byteReverse(ctx->in, 16);
MD5Transform(ctx->buf, (uint32_t *) ctx->in);
buf += 64;
len -= 64;
}
memcpy(ctx->in, buf, len);
}
static void MD5Final(unsigned char digest[16], MD5_CTX *ctx) {
unsigned count;
unsigned char *p;
uint32_t *a;
count = (ctx->bits[0] >> 3) & 0x3F;
p = ctx->in + count;
*p++ = 0x80;
count = 64 - 1 - count;
if (count < 8) {
memset(p, 0, count);
byteReverse(ctx->in, 16);
MD5Transform(ctx->buf, (uint32_t *) ctx->in);
memset(ctx->in, 0, 56);
} else {
memset(p, 0, count - 8);
}
byteReverse(ctx->in, 14);
a = (uint32_t *)ctx->in;
a[14] = ctx->bits[0];
a[15] = ctx->bits[1];
MD5Transform(ctx->buf, (uint32_t *) ctx->in);
byteReverse((unsigned char *) ctx->buf, 4);
memcpy(digest, ctx->buf, 16);
memset((char *) ctx, 0, sizeof(*ctx));
}
#endif // !HAVE_MD5
// Stringify binary data. Output buffer must be twice as big as input,
// because each byte takes 2 bytes in string representation
static void bin2str(char *to, const unsigned char *p, size_t len) {
static const char *hex = "0123456789abcdef";
for (; len--; p++) {
*to++ = hex[p[0] >> 4];
*to++ = hex[p[0] & 0x0f];
}
*to = '\0';
}
// Return stringified MD5 hash for list of strings. Buffer must be 33 bytes.
char *mg_md5(char buf[33], ...) {
unsigned char hash[16];
const char *p;
va_list ap;
MD5_CTX ctx;
MD5Init(&ctx);
va_start(ap, buf);
while ((p = va_arg(ap, const char *)) != NULL) {
MD5Update(&ctx, (const unsigned char *) p, (unsigned) strlen(p));
}
va_end(ap);
MD5Final(hash, &ctx);
bin2str(buf, hash, sizeof(hash));
return buf;
}
// Check the user's password, return 1 if OK
static int check_password(const char *method, const char *ha1, const char *uri,
const char *nonce, const char *nc, const char *cnonce,
const char *qop, const char *response) {
char ha2[32 + 1], expected_response[32 + 1];
#if 0
// Check for authentication timeout
if ((unsigned long) time(NULL) - (unsigned long) to64(nonce) > 3600) {
return 0;
}
#endif
mg_md5(ha2, method, ":", uri, NULL);
mg_md5(expected_response, ha1, ":", nonce, ":", nc,
":", cnonce, ":", qop, ":", ha2, NULL);
return mg_strcasecmp(response, expected_response) == 0;
}
// Authorize against the opened passwords file. Return 1 if authorized.
int mg_authorize_digest(struct mg_connection *c, FILE *fp) {
struct connection *conn = (struct connection *) c;
const char *hdr = mg_get_header(c, "Authorization");
char line[256], f_user[256], ha1[256], f_domain[256], user[100], nonce[100],
uri[MAX_REQUEST_SIZE], cnonce[100], resp[100], qop[100], nc[100];
if (hdr == NULL || mg_strncasecmp(hdr, "Digest ", 7) != 0) return 0;
if (!mg_parse_header(hdr, "username", user, sizeof(user))) return 0;
if (!mg_parse_header(hdr, "cnonce", cnonce, sizeof(cnonce))) return 0;
if (!mg_parse_header(hdr, "response", resp, sizeof(resp))) return 0;
if (!mg_parse_header(hdr, "uri", uri, sizeof(uri))) return 0;
if (!mg_parse_header(hdr, "qop", qop, sizeof(qop))) return 0;
if (!mg_parse_header(hdr, "nc", nc, sizeof(nc))) return 0;
if (!mg_parse_header(hdr, "nonce", nonce, sizeof(nonce))) return 0;
while (fgets(line, sizeof(line), fp) != NULL) {
if (sscanf(line, "%[^:]:%[^:]:%s", f_user, f_domain, ha1) == 3 &&
!strcmp(user, f_user) &&
// NOTE(lsm): due to a bug in MSIE, we do not compare URIs
!strcmp(conn->server->config_options[AUTH_DOMAIN], f_domain))
return check_password(c->request_method, ha1, uri,
nonce, nc, cnonce, qop, resp);
}
return 0;
}
// Return 1 if request is authorised, 0 otherwise.
static int is_authorized(struct connection *conn, const char *path) {
FILE *fp;
int authorized = 1;
if ((fp = open_auth_file(conn, path)) != NULL) {
authorized = mg_authorize_digest(&conn->mg_conn, fp);
fclose(fp);
}
return authorized;
}
static int is_authorized_for_dav(struct connection *conn) {
const char *auth_file = conn->server->config_options[DAV_AUTH_FILE];
FILE *fp;
int authorized = 0;
if (auth_file != NULL && (fp = fopen(auth_file, "r")) != NULL) {
authorized = mg_authorize_digest(&conn->mg_conn, fp);
fclose(fp);
}
return authorized;
}
static int is_dangerous_dav_request(const struct connection *conn) {
const char *s = conn->mg_conn.request_method;
return s && (!strcmp(s, "PUT") || !strcmp(s, "DELETE") ||
!strcmp(s, "MKCOL"));
}
#endif // NO_AUTH
int mg_parse_header(const char *str, const char *var_name, char *buf,
size_t buf_size) {
int ch = ' ', len = 0, n = strlen(var_name);
const char *p, *s = NULL;
if (buf != NULL) buf[0] = '\0';
// Find where variable starts
while (str != NULL && (s = strstr(str, var_name)) != NULL &&
((s > str && s[-1] != ' ') || s[n] != '=')) {
str = s + n;
}
if (s != NULL && s[n + 1] != '\0') {
s += n + 1;
if (*s == '"' || *s == '\'') ch = *s++;
p = s;
while (p[0] != '\0' && p[0] != ch && len < (int) buf_size) {
if (p[0] == '\\' && p[1] == ch) p++;
buf[len++] = *p++;
}
if (len >= (int) buf_size || (ch != ' ' && *p != ch)) {
len = 0;
} else {
if (len > 0 && s[len - 1] == ',') len--;
buf[len] = '\0';
}
}
return len;
}
#ifdef USE_LUA
#include "lua_5.2.1.h"
#ifdef _WIN32
static void *mmap(void *addr, int64_t len, int prot, int flags, int fd,
int offset) {
HANDLE fh = (HANDLE) _get_osfhandle(fd);
HANDLE mh = CreateFileMapping(fh, 0, PAGE_READONLY, 0, 0, 0);
void *p = MapViewOfFile(mh, FILE_MAP_READ, 0, 0, (size_t) len);
CloseHandle(mh);
return p;
}
#define munmap(x, y) UnmapViewOfFile(x)
#define MAP_FAILED NULL
#define MAP_PRIVATE 0
#define PROT_READ 0
#else
#include <sys/mman.h>
#endif
static void reg_string(struct lua_State *L, const char *name, const char *val) {
lua_pushstring(L, name);
lua_pushstring(L, val);
lua_rawset(L, -3);
}
static void reg_int(struct lua_State *L, const char *name, int val) {
lua_pushstring(L, name);
lua_pushinteger(L, val);
lua_rawset(L, -3);
}
static void reg_function(struct lua_State *L, const char *name,
lua_CFunction func, struct mg_connection *conn) {
lua_pushstring(L, name);
lua_pushlightuserdata(L, conn);
lua_pushcclosure(L, func, 1);
lua_rawset(L, -3);
}
static int lua_write(lua_State *L) {
int i, num_args;
const char *str;
size_t size;
struct mg_connection *conn = (struct mg_connection *)
lua_touserdata(L, lua_upvalueindex(1));
num_args = lua_gettop(L);
for (i = 1; i <= num_args; i++) {
if (lua_isstring(L, i)) {
str = lua_tolstring(L, i, &size);
mg_write(conn, str, size);
}
}
return 0;
}
static int lsp_sock_close(lua_State *L) {
if (lua_gettop(L) > 0 && lua_istable(L, -1)) {
lua_getfield(L, -1, "sock");
closesocket((sock_t) lua_tonumber(L, -1));
} else {
return luaL_error(L, "invalid :close() call");
}
return 1;
}
static int lsp_sock_recv(lua_State *L) {
char buf[2000];
int n;
if (lua_gettop(L) > 0 && lua_istable(L, -1)) {
lua_getfield(L, -1, "sock");
n = recv((sock_t) lua_tonumber(L, -1), buf, sizeof(buf), 0);
if (n <= 0) {
lua_pushnil(L);
} else {
lua_pushlstring(L, buf, n);
}
} else {
return luaL_error(L, "invalid :close() call");
}
return 1;
}
static int lsp_sock_send(lua_State *L) {
const char *buf;
size_t len, sent = 0;
int n, sock;
if (lua_gettop(L) > 1 && lua_istable(L, -2) && lua_isstring(L, -1)) {
buf = lua_tolstring(L, -1, &len);
lua_getfield(L, -2, "sock");
sock = (int) lua_tonumber(L, -1);
while (sent < len) {
if ((n = send(sock, buf + sent, len - sent, 0)) <= 0) break;
sent += n;
}
lua_pushnumber(L, sent);
} else {
return luaL_error(L, "invalid :close() call");
}
return 1;
}
static const struct luaL_Reg luasocket_methods[] = {
{"close", lsp_sock_close},
{"send", lsp_sock_send},
{"recv", lsp_sock_recv},
{NULL, NULL}
};
static sock_t conn2(const char *host, int port) {
struct sockaddr_in sin;
struct hostent *he = NULL;
sock_t sock = INVALID_SOCKET;
if (host != NULL &&
(he = gethostbyname(host)) != NULL &&
(sock = socket(PF_INET, SOCK_STREAM, 0)) != INVALID_SOCKET) {
set_close_on_exec(sock);
sin.sin_family = AF_INET;
sin.sin_port = htons((uint16_t) port);
sin.sin_addr = * (struct in_addr *) he->h_addr_list[0];
if (connect(sock, (struct sockaddr *) &sin, sizeof(sin)) != 0) {
closesocket(sock);
sock = INVALID_SOCKET;
}
}
return sock;
}
static int lsp_connect(lua_State *L) {
sock_t sock;
if (lua_isstring(L, -2) && lua_isnumber(L, -1)) {
sock = conn2(lua_tostring(L, -2), (int) lua_tonumber(L, -1));
if (sock == INVALID_SOCKET) {
lua_pushnil(L);
} else {
lua_newtable(L);
reg_int(L, "sock", sock);
reg_string(L, "host", lua_tostring(L, -4));
luaL_getmetatable(L, "luasocket");
lua_setmetatable(L, -2);
}
} else {
return luaL_error(L, "connect(host,port): invalid parameter given.");
}
return 1;
}
static void prepare_lua_environment(struct mg_connection *ri, lua_State *L) {
extern void luaL_openlibs(lua_State *);
int i;
luaL_openlibs(L);
#ifdef USE_LUA_SQLITE3
{ extern int luaopen_lsqlite3(lua_State *); luaopen_lsqlite3(L); }
#endif
luaL_newmetatable(L, "luasocket");
lua_pushliteral(L, "__index");
luaL_newlib(L, luasocket_methods);
lua_rawset(L, -3);
lua_pop(L, 1);
lua_register(L, "connect", lsp_connect);
if (ri == NULL) return;
// Register mg module
lua_newtable(L);
reg_function(L, "write", lua_write, ri);
// Export request_info
lua_pushstring(L, "request_info");
lua_newtable(L);
reg_string(L, "request_method", ri->request_method);
reg_string(L, "uri", ri->uri);
reg_string(L, "http_version", ri->http_version);
reg_string(L, "query_string", ri->query_string);
reg_string(L, "remote_ip", ri->remote_ip);
reg_int(L, "remote_port", ri->remote_port);
reg_int(L, "num_headers", ri->num_headers);
lua_pushstring(L, "http_headers");
lua_newtable(L);
for (i = 0; i < ri->num_headers; i++) {
reg_string(L, ri->http_headers[i].name, ri->http_headers[i].value);
}
lua_rawset(L, -3);
lua_rawset(L, -3);
lua_setglobal(L, "mg");
// Register default mg.onerror function
(void) luaL_dostring(L, "mg.onerror = function(e) mg.write('\\nLua "
"error:\\n', debug.traceback(e, 1)) end");
}
static int lua_error_handler(lua_State *L) {
const char *error_msg = lua_isstring(L, -1) ? lua_tostring(L, -1) : "?\n";
lua_getglobal(L, "mg");
if (!lua_isnil(L, -1)) {
lua_getfield(L, -1, "write"); // call mg.write()
lua_pushstring(L, error_msg);
lua_pushliteral(L, "\n");
lua_call(L, 2, 0);
(void) luaL_dostring(L, "mg.write(debug.traceback(), '\\n')");
} else {
printf("Lua error: [%s]\n", error_msg);
(void) luaL_dostring(L, "print(debug.traceback(), '\\n')");
}
// TODO(lsm): leave the stack balanced
return 0;
}
static void lsp(struct connection *conn, const char *p, int len, lua_State *L) {
int i, j, pos = 0;
for (i = 0; i < len; i++) {
if (p[i] == '<' && p[i + 1] == '?') {
for (j = i + 1; j < len ; j++) {
if (p[j] == '?' && p[j + 1] == '>') {
mg_write(&conn->mg_conn, p + pos, i - pos);
if (luaL_loadbuffer(L, p + (i + 2), j - (i + 2), "") == LUA_OK) {
lua_pcall(L, 0, LUA_MULTRET, 0);
}
pos = j + 2;
i = pos - 1;
break;
}
}
}
}
if (i > pos) mg_write(&conn->mg_conn, p + pos, i - pos);
}
static void handle_lsp_request(struct connection *conn, const char *path,
file_stat_t *st) {
void *p = NULL;
lua_State *L = NULL;
FILE *fp = NULL;
if ((fp = fopen(path, "r")) == NULL ||
(p = mmap(NULL, st->st_size, PROT_READ, MAP_PRIVATE,
fileno(fp), 0)) == MAP_FAILED ||
(L = luaL_newstate()) == NULL) {
send_http_error(conn, 500, "mmap(%s): %s", path, strerror(errno));
} else {
// We're not sending HTTP headers here, Lua page must do it.
prepare_lua_environment(&conn->mg_conn, L);
lua_pushcclosure(L, &lua_error_handler, 0);
lua_pushglobaltable(L);
lsp(conn, p, st->st_size, L);
close_local_endpoint(conn);
}
if (L != NULL) lua_close(L);
if (p != NULL) munmap(p, st->st_size);
if (fp != NULL) fclose(fp);
}
#endif // USE_LUA
static void open_local_endpoint(struct connection *conn) {
const char *cl_hdr = mg_get_header(&conn->mg_conn, "Content-Length");
#ifndef NO_FILESYSTEM
static const char lua_pat[] = LUA_SCRIPT_PATTERN;
file_stat_t st;
char path[MAX_PATH_SIZE];
int exists = 0, is_directory = 0;
const char *cgi_pat = conn->server->config_options[CGI_PATTERN];
const char *dir_lst = conn->server->config_options[ENABLE_DIRECTORY_LISTING];
#endif
conn->mg_conn.content_len = cl_hdr == NULL ? 0 : (int) to64(cl_hdr);
// Call URI handler if one is registered for this URI
conn->endpoint.uh = find_uri_handler(conn->server, conn->mg_conn.uri);
if (conn->endpoint.uh != NULL) {
conn->endpoint_type = EP_USER;
conn->mg_conn.content = conn->local_iobuf.buf;
#if USE_POST_SIZE_LIMIT > 1
{
const char *cl = mg_get_header(&conn->mg_conn, "Content-Length");
if (!strcmp(conn->mg_conn.request_method, "POST") &&
(cl == NULL || to64(cl) > USE_POST_SIZE_LIMIT)) {
send_http_error(conn, 500, "POST size > %zu",
(size_t) USE_POST_SIZE_LIMIT);
}
}
#endif
return;
}
#ifdef NO_FILESYSTEM
send_http_error(conn, 404, NULL);
#else
exists = convert_uri_to_file_name(conn, path, sizeof(path), &st);
is_directory = S_ISDIR(st.st_mode);
if (!strcmp(conn->mg_conn.request_method, "OPTIONS")) {
send_options(conn);
} else if (conn->server->config_options[DOCUMENT_ROOT] == NULL) {
send_http_error(conn, 404, NULL);
#ifndef NO_AUTH
} else if ((!is_dangerous_dav_request(conn) && !is_authorized(conn, path)) ||
(is_dangerous_dav_request(conn) && !is_authorized_for_dav(conn))) {
send_authorization_request(conn);
#endif
#ifndef NO_DAV
} else if (!strcmp(conn->mg_conn.request_method, "PROPFIND")) {
handle_propfind(conn, path, &st);
} else if (!strcmp(conn->mg_conn.request_method, "MKCOL")) {
handle_mkcol(conn, path);
} else if (!strcmp(conn->mg_conn.request_method, "DELETE")) {
handle_delete(conn, path);
} else if (!strcmp(conn->mg_conn.request_method, "PUT")) {
handle_put(conn, path);
#endif
} else if (!exists || must_hide_file(conn, path)) {
send_http_error(conn, 404, NULL);
} else if (is_directory &&
conn->mg_conn.uri[strlen(conn->mg_conn.uri) - 1] != '/') {
conn->mg_conn.status_code = 301;
mg_printf(&conn->mg_conn, "HTTP/1.1 301 Moved Permanently\r\n"
"Location: %s/\r\n\r\n", conn->mg_conn.uri);
close_local_endpoint(conn);
} else if (is_directory && !find_index_file(conn, path, sizeof(path), &st)) {
if (!mg_strcasecmp(dir_lst, "yes")) {
#ifndef NO_DIRECTORY_LISTING
send_directory_listing(conn, path);
#else
send_http_error(conn, 501, NULL);
#endif
} else {
send_http_error(conn, 403, NULL);
}
} else if (match_prefix(lua_pat, sizeof(lua_pat) - 1, path) > 0) {
#ifdef USE_LUA
handle_lsp_request(conn, path, &st);
#else
send_http_error(conn, 501, NULL);
#endif
} else if (match_prefix(cgi_pat, strlen(cgi_pat), path) > 0) {
if (strcmp(conn->mg_conn.request_method, "POST") &&
strcmp(conn->mg_conn.request_method, "HEAD") &&
strcmp(conn->mg_conn.request_method, "GET")) {
send_http_error(conn, 501, NULL);
} else {
#if !defined(NO_CGI)
open_cgi_endpoint(conn, path);
#else
send_http_error(conn, 501, NULL);
#endif // !NO_CGI
}
} else if (is_not_modified(conn, &st)) {
send_http_error(conn, 304, NULL);
} else if ((conn->endpoint.fd = open(path, O_RDONLY | O_BINARY)) != -1) {
// O_BINARY is required for Windows, otherwise in default text mode
// two bytes \r\n will be read as one.
open_file_endpoint(conn, path, &st);
} else {
send_http_error(conn, 404, NULL);
}
#endif // NO_FILESYSTEM
}
static void send_continue_if_expected(struct connection *conn) {
static const char expect_response[] = "HTTP/1.1 100 Continue\r\n\r\n";
const char *expect_hdr = mg_get_header(&conn->mg_conn, "Expect");
if (expect_hdr != NULL && !mg_strcasecmp(expect_hdr, "100-continue")) {
spool(&conn->remote_iobuf, expect_response, sizeof(expect_response) - 1);
}
}
static int is_valid_uri(const char *uri) {
// Conform to http://www.w3.org/Protocols/rfc2616/rfc2616-sec5.html#sec5.1.2
// URI can be an asterisk (*) or should start with slash.
return uri[0] == '/' || (uri[0] == '*' && uri[1] == '\0');
}
static void process_request(struct connection *conn) {
struct iobuf *io = &conn->local_iobuf;
if (conn->request_len == 0 &&
(conn->request_len = get_request_len(io->buf, io->len)) > 0) {
// If request is buffered in, remove it from the iobuf. This is because
// iobuf could be reallocated, and pointers in parsed request could
// become invalid.
conn->request = (char *) malloc(conn->request_len);
memcpy(conn->request, io->buf, conn->request_len);
DBG(("%p ==> [%.*s]", conn, conn->request_len, conn->request));
memmove(io->buf, io->buf + conn->request_len, io->len - conn->request_len);
io->len -= conn->request_len;
conn->request_len = parse_http_message(conn->request, conn->request_len,
&conn->mg_conn);
}
DBG(("%p %d %d", conn, conn->request_len, io->len));
if (conn->request_len < 0 ||
(conn->request_len > 0 && !is_valid_uri(conn->mg_conn.uri))) {
send_http_error(conn, 400, NULL);
} else if (conn->request_len == 0 && io->len > MAX_REQUEST_SIZE) {
send_http_error(conn, 413, NULL);
} else if (conn->request_len > 0 &&
strcmp(conn->mg_conn.http_version, "1.0") != 0 &&
strcmp(conn->mg_conn.http_version, "1.1") != 0) {
send_http_error(conn, 505, NULL);
} else if (conn->request_len > 0 && conn->endpoint_type == EP_NONE) {
#ifndef NO_WEBSOCKET
send_websocket_handshake_if_requested(&conn->mg_conn);
#endif
send_continue_if_expected(conn);
open_local_endpoint(conn);
}
#ifndef NO_CGI
if (conn->endpoint_type == EP_CGI && io->len > 0) {
forward_post_data(conn);
}
#endif
if (conn->endpoint_type == EP_USER) {
call_uri_handler_if_data_is_buffered(conn);
}
#ifndef NO_DAV
if (conn->endpoint_type == EP_PUT && io->len > 0) {
forward_put_data(conn);
}
#endif
}
static void read_from_client(struct connection *conn) {
char buf[IOBUF_SIZE];
int n = 0;
if (conn->ssl != NULL) {
#ifdef USE_SSL
if (conn->flags & CONN_SSL_HANDS_SHAKEN) {
n = SSL_read(conn->ssl, buf, sizeof(buf));
} else {
if (SSL_accept(conn->ssl) == 1) {
conn->flags |= CONN_SSL_HANDS_SHAKEN;
}
return;
}
#endif
} else {
n = recv(conn->client_sock, buf, sizeof(buf), 0);
}
DBG(("%p %d", conn, n));
if (is_error(n)) {
conn->flags |= CONN_CLOSE;
} else if (n > 0) {
spool(&conn->local_iobuf, buf, n);
process_request(conn);
}
}
#ifndef NO_LOGGING
static void log_header(const struct mg_connection *conn, const char *header,
FILE *fp) {
const char *header_value;
if ((header_value = mg_get_header(conn, header)) == NULL) {
(void) fprintf(fp, "%s", " -");
} else {
(void) fprintf(fp, " \"%s\"", header_value);
}
}
static void log_access(const struct connection *conn, const char *path) {
const struct mg_connection *c = &conn->mg_conn;
FILE *fp = (path == NULL) ? NULL : fopen(path, "a+");
char date[64], user[100];
if (fp == NULL) return;
strftime(date, sizeof(date), "%d/%b/%Y:%H:%M:%S %z",
localtime(&conn->birth_time));
flockfile(fp);
mg_parse_header(mg_get_header(&conn->mg_conn, "Authorization"), "username",
user, sizeof(user));
fprintf(fp, "%s - %s [%s] \"%s %s HTTP/%s\" %d %" INT64_FMT,
c->remote_ip, user[0] == '\0' ? "-" : user, date,
c->request_method ? c->request_method : "-",
c->uri ? c->uri : "-", c->http_version,
c->status_code, conn->num_bytes_sent);
log_header(c, "Referer", fp);
log_header(c, "User-Agent", fp);
fputc('\n', fp);
fflush(fp);
funlockfile(fp);
fclose(fp);
}
#endif
static void close_local_endpoint(struct connection *conn) {
// Must be done before free()
int keep_alive = should_keep_alive(&conn->mg_conn) &&
(conn->endpoint_type == EP_FILE || conn->endpoint_type == EP_USER);
switch (conn->endpoint_type) {
case EP_FILE: close(conn->endpoint.fd); break;
case EP_CGI: closesocket(conn->endpoint.cgi_sock); break;
default: break;
}
#ifndef NO_LOGGING
if (conn->mg_conn.status_code != 400) {
log_access(conn, conn->server->config_options[ACCESS_LOG_FILE]);
}
#endif
conn->endpoint_type = EP_NONE;
conn->flags = 0;
conn->cl = conn->num_bytes_sent = conn->request_len = 0;
free(conn->request);
conn->request = NULL;
if (keep_alive) {
process_request(conn); // Can call us recursively if pipelining is used
} else {
conn->flags |= conn->remote_iobuf.len == 0 ? CONN_CLOSE : CONN_SPOOL_DONE;
}
}
static void transfer_file_data(struct connection *conn) {
char buf[IOBUF_SIZE];
int n = read(conn->endpoint.fd, buf, conn->cl < (int64_t) sizeof(buf) ?
(int) conn->cl : (int) sizeof(buf));
if (is_error(n)) {
close_local_endpoint(conn);
} else if (n > 0) {
conn->cl -= n;
spool(&conn->remote_iobuf, buf, n);
if (conn->cl <= 0) {
close_local_endpoint(conn);
}
}
}
static void execute_iteration(struct mg_server *server) {
struct ll *lp, *tmp;
struct connection *conn;
union { void (*f)(struct mg_connection *, void *); void *p; } msg[2];
recv(server->ctl[1], (void *) msg, sizeof(msg), 0);
LINKED_LIST_FOREACH(&server->active_connections, lp, tmp) {
conn = LINKED_LIST_ENTRY(lp, struct connection, link);
msg[0].f(&conn->mg_conn, msg[1].p);
}
}
void add_to_set(sock_t sock, fd_set *set, sock_t *max_fd) {
FD_SET(sock, set);
if (sock > *max_fd) {
*max_fd = sock;
}
}
unsigned int mg_poll_server(struct mg_server *server, int milliseconds) {
struct ll *lp, *tmp;
struct connection *conn;
struct timeval tv;
fd_set read_set, write_set;
sock_t max_fd = -1;
time_t current_time = time(NULL), expire_time = current_time -
atoi(server->config_options[IDLE_TIMEOUT_MS]) / 1000;
if (server->listening_sock == INVALID_SOCKET) return 0;
FD_ZERO(&read_set);
FD_ZERO(&write_set);
add_to_set(server->listening_sock, &read_set, &max_fd);
add_to_set(server->ctl[1], &read_set, &max_fd);
LINKED_LIST_FOREACH(&server->active_connections, lp, tmp) {
conn = LINKED_LIST_ENTRY(lp, struct connection, link);
add_to_set(conn->client_sock, &read_set, &max_fd);
if (conn->endpoint_type == EP_FILE) {
transfer_file_data(conn);
} else if (conn->endpoint_type == EP_CGI) {
add_to_set(conn->endpoint.cgi_sock, &read_set, &max_fd);
}
if (conn->remote_iobuf.len > 0 && !(conn->flags & CONN_BUFFER)) {
add_to_set(conn->client_sock, &write_set, &max_fd);
} else if (conn->flags & CONN_CLOSE) {
close_conn(conn);
}
}
tv.tv_sec = milliseconds / 1000;
tv.tv_usec = (milliseconds % 1000) * 1000;
if (select(max_fd + 1, &read_set, &write_set, NULL, &tv) > 0) {
if (FD_ISSET(server->ctl[1], &read_set)) {
execute_iteration(server);
}
// Accept new connections
if (FD_ISSET(server->listening_sock, &read_set)) {
while ((conn = accept_new_connection(server)) != NULL) {
conn->birth_time = conn->last_activity_time = current_time;
}
}
// Read/write from clients
LINKED_LIST_FOREACH(&server->active_connections, lp, tmp) {
conn = LINKED_LIST_ENTRY(lp, struct connection, link);
if (FD_ISSET(conn->client_sock, &read_set)) {
conn->last_activity_time = current_time;
read_from_client(conn);
}
#ifndef NO_CGI
if (conn->endpoint_type == EP_CGI &&
FD_ISSET(conn->endpoint.cgi_sock, &read_set)) {
read_from_cgi(conn);
}
#endif
if (FD_ISSET(conn->client_sock, &write_set) &&
!(conn->flags & CONN_BUFFER)) {
conn->last_activity_time = current_time;
write_to_client(conn);
}
}
}
// Close expired connections and those that need to be closed
LINKED_LIST_FOREACH(&server->active_connections, lp, tmp) {
conn = LINKED_LIST_ENTRY(lp, struct connection, link);
if (conn->mg_conn.is_websocket) {
ping_idle_websocket_connection(conn, current_time);
}
if (conn->flags & CONN_CLOSE || conn->last_activity_time < expire_time) {
close_conn(conn);
}
}
return (unsigned int) current_time;
}
void mg_destroy_server(struct mg_server **server) {
int i;
struct ll *lp, *tmp;
if (server != NULL && *server != NULL) {
// Do one last poll, see https://github.com/cesanta/mongoose/issues/286
mg_poll_server(*server, 0);
closesocket((*server)->listening_sock);
closesocket((*server)->ctl[0]);
closesocket((*server)->ctl[1]);
LINKED_LIST_FOREACH(&(*server)->active_connections, lp, tmp) {
free(LINKED_LIST_ENTRY(lp, struct connection, link));
}
LINKED_LIST_FOREACH(&(*server)->uri_handlers, lp, tmp) {
free(LINKED_LIST_ENTRY(lp, struct uri_handler, link)->uri);
free(LINKED_LIST_ENTRY(lp, struct uri_handler, link));
}
for (i = 0; i < (int) ARRAY_SIZE((*server)->config_options); i++) {
free((*server)->config_options[i]); // It is OK to free(NULL)
}
#ifdef USE_SSL
if ((*server)->ssl_ctx != NULL) SSL_CTX_free((*server)->ssl_ctx);
#endif
free(*server);
*server = NULL;
}
}
// Apply function to all active connections.
void mg_iterate_over_connections(struct mg_server *server,
void (*func)(struct mg_connection *, void *),
void *param) {
// Send closure (function + parameter) to the IO thread to execute
union { void (*f)(struct mg_connection *, void *); void *p; } msg[2];
msg[0].f = func;
msg[1].p = param;
send(server->ctl[0], (void *) msg, sizeof(msg), 0);
}
void mg_add_uri_handler(struct mg_server *server, const char *uri,
mg_handler_t handler) {
struct uri_handler *p = (struct uri_handler *) malloc(sizeof(*p));
if (p != NULL) {
LINKED_LIST_ADD_TO_FRONT(&server->uri_handlers, &p->link);
p->uri = mg_strdup(uri);
p->handler = handler;
}
}
static int get_var(const char *data, size_t data_len, const char *name,
char *dst, size_t dst_len) {
const char *p, *e, *s;
size_t name_len;
int len;
if (dst == NULL || dst_len == 0) {
len = -2;
} else if (data == NULL || name == NULL || data_len == 0) {
len = -1;
dst[0] = '\0';
} else {
name_len = strlen(name);
e = data + data_len;
len = -1;
dst[0] = '\0';
// data is "var1=val1&var2=val2...". Find variable first
for (p = data; p + name_len < e; p++) {
if ((p == data || p[-1] == '&') && p[name_len] == '=' &&
!mg_strncasecmp(name, p, name_len)) {
// Point p to variable value
p += name_len + 1;
// Point s to the end of the value
s = (const char *) memchr(p, '&', (size_t)(e - p));
if (s == NULL) {
s = e;
}
assert(s >= p);
// Decode variable into destination buffer
len = mg_url_decode(p, (size_t)(s - p), dst, dst_len, 1);
// Redirect error code from -1 to -2 (destination buffer too small).
if (len == -1) {
len = -2;
}
break;
}
}
}
return len;
}
int mg_get_var(const struct mg_connection *conn, const char *name,
char *dst, size_t dst_len) {
int len = get_var(conn->query_string, conn->query_string == NULL ? 0 :
strlen(conn->query_string), name, dst, dst_len);
if (len < 0) {
len = get_var(conn->content, conn->content_len, name, dst, dst_len);
}
return len;
}
const char **mg_get_valid_option_names(void) {
return static_config_options;
}
static int get_option_index(const char *name) {
int i;
for (i = 0; static_config_options[i * 2] != NULL; i++) {
if (strcmp(static_config_options[i * 2], name) == 0) {
return i;
}
}
return -1;
}
static void set_default_option_values(char **opts) {
const char *value, **all_opts = mg_get_valid_option_names();
int i;
for (i = 0; all_opts[i * 2] != NULL; i++) {
value = all_opts[i * 2 + 1];
if (opts[i] == NULL && value != NULL) {
opts[i] = mg_strdup(value);
}
}
}
// Valid listening port spec is: [ip_address:]port, e.g. "80", "127.0.0.1:3128"
static int parse_port_string(const char *str, union socket_address *sa) {
unsigned int a, b, c, d, port;
int len = 0;
#ifdef USE_IPV6
char buf[100];
#endif
// MacOS needs that. If we do not zero it, subsequent bind() will fail.
// Also, all-zeroes in the socket address means binding to all addresses
// for both IPv4 and IPv6 (INADDR_ANY and IN6ADDR_ANY_INIT).
memset(sa, 0, sizeof(*sa));
sa->sin.sin_family = AF_INET;
if (sscanf(str, "%u.%u.%u.%u:%u%n", &a, &b, &c, &d, &port, &len) == 5) {
// Bind to a specific IPv4 address, e.g. 192.168.1.5:8080
sa->sin.sin_addr.s_addr = htonl((a << 24) | (b << 16) | (c << 8) | d);
sa->sin.sin_port = htons((uint16_t) port);
#if defined(USE_IPV6)
} else if (sscanf(str, "[%49[^]]]:%d%n", buf, &port, &len) == 2 &&
inet_pton(AF_INET6, buf, &sa->sin6.sin6_addr)) {
// IPv6 address, e.g. [3ffe:2a00:100:7031::1]:8080
sa->sin6.sin6_family = AF_INET6;
sa->sin6.sin6_port = htons((uint16_t) port);
#endif
} else if (sscanf(str, "%u%n", &port, &len) == 1) {
// If only port is specified, bind to IPv4, INADDR_ANY
sa->sin.sin_port = htons((uint16_t) port);
} else {
port = 0; // Parsing failure. Make port invalid.
}
return port > 0 && port < 0xffff && str[len] == '\0';
}
const char *mg_set_option(struct mg_server *server, const char *name,
const char *value) {
int ind = get_option_index(name);
const char *error_msg = NULL;
if (ind < 0) {
error_msg = "No such option";
} else {
if (server->config_options[ind] != NULL) {
free(server->config_options[ind]);
}
server->config_options[ind] = mg_strdup(value);
DBG(("%s => %s", name, value));
if (ind == LISTENING_PORT) {
if (server->listening_sock != INVALID_SOCKET) {
closesocket(server->listening_sock);
}
parse_port_string(server->config_options[LISTENING_PORT], &server->lsa);
server->listening_sock = open_listening_socket(&server->lsa);
if (server->listening_sock == INVALID_SOCKET) {
error_msg = "Cannot bind to port";
} else {
set_non_blocking_mode(server->listening_sock);
}
#ifndef _WIN32
} else if (ind == RUN_AS_USER) {
struct passwd *pw;
if ((pw = getpwnam(value)) == NULL) {
error_msg = "Unknown user";
} else if (setgid(pw->pw_gid) != 0) {
error_msg = "setgid() failed";
} else if (setuid(pw->pw_uid) != 0) {
error_msg = "setuid() failed";
}
#endif
#ifdef USE_SSL
} else if (ind == SSL_CERTIFICATE) {
SSL_library_init();
if ((server->ssl_ctx = SSL_CTX_new(SSLv23_server_method())) == NULL) {
error_msg = "SSL_CTX_new() failed";
} else if (SSL_CTX_use_certificate_file(server->ssl_ctx, value, 1) == 0 ||
SSL_CTX_use_PrivateKey_file(server->ssl_ctx, value, 1) == 0) {
error_msg = "Cannot load PEM file";
} else {
SSL_CTX_use_certificate_chain_file(server->ssl_ctx, value);
}
#endif
}
}
return error_msg;
}
void mg_set_listening_socket(struct mg_server *server, int sock) {
if (server->listening_sock != INVALID_SOCKET) {
closesocket(server->listening_sock);
}
server->listening_sock = sock;
}
int mg_get_listening_socket(struct mg_server *server) {
return server->listening_sock;
}
const char *mg_get_option(const struct mg_server *server, const char *name) {
const char **opts = (const char **) server->config_options;
int i = get_option_index(name);
return i == -1 ? NULL : opts[i] == NULL ? "" : opts[i];
}
struct mg_server *mg_create_server(void *server_data) {
struct mg_server *server = (struct mg_server *) calloc(1, sizeof(*server));
#ifdef _WIN32
WSADATA data;
WSAStartup(MAKEWORD(2, 2), &data);
#else
// Ignore SIGPIPE signal, so if browser cancels the request, it
// won't kill the whole process.
signal(SIGPIPE, SIG_IGN);
#endif
LINKED_LIST_INIT(&server->active_connections);
LINKED_LIST_INIT(&server->uri_handlers);
// Create control socket pair. Do it in a loop to protect from
// interrupted syscalls in mg_socketpair().
do {
mg_socketpair(server->ctl);
} while (server->ctl[0] == INVALID_SOCKET);
server->server_data = server_data;
server->listening_sock = INVALID_SOCKET;
set_default_option_values(server->config_options);
return server;
}
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