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5425b94f39
mongoose/mongoose.c
Sergey Lyubka 5425b94f39 introduced struct mg_config. Fixed Range response.
2010-06-25 17:23:17 +02:00

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/*
* Copyright (c) 2004-2009 Sergey Lyubka
* Portions Copyright (c) 2009 Gilbert Wellisch
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
* $Id: mongoose.c 517 2010-05-03 12:54:59Z valenok $
*/
#if defined(_WIN32)
#define _CRT_SECURE_NO_WARNINGS /* Disable deprecation warning in VS2005 */
#else
#define _XOPEN_SOURCE 600 /* For flockfile() on Linux */
#define _LARGEFILE_SOURCE /* Enable 64-bit file offsets */
#endif
#ifndef _WIN32_WCE /* Some ANSI #includes are not available on Windows CE */
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <signal.h>
#include <fcntl.h>
#endif /* !_WIN32_WCE */
#include <time.h>
#include <stdlib.h>
#include <stdarg.h>
#include <assert.h>
#include <string.h>
#include <ctype.h>
#include <limits.h>
#include <stddef.h>
#include <stdio.h>
#if defined(_WIN32) /* Windows specific #includes and #defines */
#define _WIN32_WINNT 0x0400 /* To make it link in VS2005 */
#include <windows.h>
#ifndef _WIN32_WCE
#include <process.h>
#include <direct.h>
#include <io.h>
#else /* _WIN32_WCE */
/* Windows CE-specific definitions */
#include <winsock2.h>
#define NO_CGI /* WinCE has no pipes */
#define NO_SSI /* WinCE has no pipes */
#define FILENAME_MAX MAX_PATH
#define BUFSIZ 4096
typedef long off_t;
#define errno GetLastError()
#define strerror(x) _ultoa(x, (char *) _alloca(sizeof(x) *3 ), 10)
#endif /* _WIN32_WCE */
#define EPOCH_DIFF 0x019DB1DED53E8000 /* 116444736000000000 nsecs */
#define RATE_DIFF 10000000 /* 100 nsecs */
#define MAKEUQUAD(lo, hi) ((uint64_t)(((uint32_t)(lo)) | \
((uint64_t)((uint32_t)(hi))) << 32))
#define SYS2UNIX_TIME(lo, hi) \
(time_t) ((MAKEUQUAD((lo), (hi)) - EPOCH_DIFF) / RATE_DIFF)
/*
* Visual Studio 6 does not know __func__ or __FUNCTION__
* The rest of MS compilers use __FUNCTION__, not C99 __func__
* Also use _strtoui64 on modern M$ compilers
*/
#if defined(_MSC_VER) && _MSC_VER < 1300
#define STRX(x) #x
#define STR(x) STRX(x)
#define __func__ "line " STR(__LINE__)
#define strtoull(x, y, z) strtoul(x, y, z)
#define strtoll(x, y, z) strtol(x, y, z)
#else
#define __func__ __FUNCTION__
#define strtoull(x, y, z) _strtoui64(x, y, z)
#define strtoll(x, y, z) _strtoi64(x, y, z)
#endif /* _MSC_VER */
#define ERRNO GetLastError()
#define NO_SOCKLEN_T
#define SSL_LIB "ssleay32.dll"
#define CRYPTO_LIB "libeay32.dll"
#define DIRSEP '\\'
#define IS_DIRSEP_CHAR(c) ((c) == '/' || (c) == '\\')
#define O_NONBLOCK 0
#if !defined(EWOULDBLOCK)
#define EWOULDBLOCK WSAEWOULDBLOCK
#endif /* !EWOULDBLOCK */
#define _POSIX_
#define INT64_FMT "I64d"
#define SHUT_WR 1
#define snprintf _snprintf
#define vsnprintf _vsnprintf
#define sleep(x) Sleep((x) * 1000)
#define popen(x, y) _popen(x, y)
#define pclose(x) _pclose(x)
#define close(x) _close(x)
#define dlsym(x,y) GetProcAddress((HINSTANCE) (x), (y))
#define RTLD_LAZY 0
#define fseeko(x, y, z) fseek((x), (y), (z))
#define fdopen(x, y) _fdopen((x), (y))
#define write(x, y, z) _write((x), (y), (unsigned) z)
#define read(x, y, z) _read((x), (y), (unsigned) z)
#define flockfile(x) (void) 0
#define funlockfile(x) (void) 0
#if !defined(fileno)
#define fileno(x) _fileno(x)
#endif /* !fileno MINGW #defines fileno */
typedef HANDLE pthread_mutex_t;
typedef HANDLE pthread_cond_t;
typedef DWORD pthread_t;
#define pid_t HANDLE /* MINGW typedefs pid_t to int. Using #define here. */
struct timespec {
long tv_nsec;
long tv_sec;
};
static int pthread_mutex_lock(pthread_mutex_t *);
static int pthread_mutex_unlock(pthread_mutex_t *);
static FILE *mg_fopen(const char *path, const char *mode);
#if defined(HAVE_STDINT)
#include <stdint.h>
#else
typedef unsigned int uint32_t;
typedef unsigned short uint16_t;
typedef unsigned __int64 uint64_t;
typedef __int64 int64_t;
#define INT64_MAX 9223372036854775807
#endif /* HAVE_STDINT */
/*
* POSIX dirent interface
*/
struct dirent {
char d_name[FILENAME_MAX];
};
typedef struct DIR {
HANDLE handle;
WIN32_FIND_DATAW info;
struct dirent result;
} DIR;
#else /* UNIX specific */
#include <sys/wait.h>
#include <sys/socket.h>
#include <sys/select.h>
#include <sys/mman.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/time.h>
#include <stdint.h>
#include <inttypes.h>
#include <pwd.h>
#include <unistd.h>
#include <dirent.h>
#include <dlfcn.h>
#include <pthread.h>
#define SSL_LIB "libssl.so"
#define CRYPTO_LIB "libcrypto.so"
#define DIRSEP '/'
#define IS_DIRSEP_CHAR(c) ((c) == '/')
#define O_BINARY 0
#define closesocket(a) close(a)
#define mg_fopen(x, y) fopen(x, y)
#define mg_mkdir(x, y) mkdir(x, y)
#define mg_remove(x) remove(x)
#define mg_rename(x, y) rename(x, y)
#define ERRNO errno
#define INVALID_SOCKET (-1)
#define INT64_FMT PRId64
typedef int SOCKET;
#endif /* End of Windows and UNIX specific includes */
#include "mongoose.h"
#define MONGOOSE_VERSION "2.9"
#define PASSWORDS_FILE_NAME ".htpasswd"
#define CGI_ENVIRONMENT_SIZE 4096
#define MAX_CGI_ENVIR_VARS 64
#define MAX_REQUEST_SIZE 8192
#define ARRAY_SIZE(array) (sizeof(array) / sizeof(array[0]))
#define DEBUG_MGS_PREFIX "*** Mongoose debug *** "
#if defined(DEBUG)
#define DEBUG_TRACE(x) do {printf x; putchar('\n'); fflush(stdout);} while (0)
#else
#define DEBUG_TRACE(x)
#endif /* DEBUG */
/*
* Darwin prior to 7.0 and Win32 do not have socklen_t
*/
#ifdef NO_SOCKLEN_T
typedef int socklen_t;
#endif /* NO_SOCKLEN_T */
#if !defined(FALSE)
enum {FALSE, TRUE};
#endif /* !FALSE */
typedef int bool_t;
typedef void * (*mg_thread_func_t)(void *);
static const char *http_500_error = "Internal Server Error";
/*
* Snatched from OpenSSL includes. I put the prototypes here to be independent
* from the OpenSSL source installation. Having this, mongoose + SSL can be
* built on any system with binary SSL libraries installed.
*/
typedef struct ssl_st SSL;
typedef struct ssl_method_st SSL_METHOD;
typedef struct ssl_ctx_st SSL_CTX;
#define SSL_ERROR_WANT_READ 2
#define SSL_ERROR_WANT_WRITE 3
#define SSL_FILETYPE_PEM 1
#define CRYPTO_LOCK 1
/*
* Dynamically loaded SSL functionality
*/
struct ssl_func {
const char *name; /* SSL function name */
void (*ptr)(void); /* Function pointer */
};
#define SSL_free(x) (* (void (*)(SSL *)) ssl_sw[0].ptr)(x)
#define SSL_accept(x) (* (int (*)(SSL *)) ssl_sw[1].ptr)(x)
#define SSL_connect(x) (* (int (*)(SSL *)) ssl_sw[2].ptr)(x)
#define SSL_read(x,y,z) (* (int (*)(SSL *, void *, int)) \
ssl_sw[3].ptr)((x),(y),(z))
#define SSL_write(x,y,z) (* (int (*)(SSL *, const void *,int)) \
ssl_sw[4].ptr)((x), (y), (z))
#define SSL_get_error(x,y)(* (int (*)(SSL *, int)) ssl_sw[5])((x), (y))
#define SSL_set_fd(x,y) (* (int (*)(SSL *, SOCKET)) ssl_sw[6].ptr)((x), (y))
#define SSL_new(x) (* (SSL * (*)(SSL_CTX *)) ssl_sw[7].ptr)(x)
#define SSL_CTX_new(x) (* (SSL_CTX * (*)(SSL_METHOD *)) ssl_sw[8].ptr)(x)
#define SSLv23_server_method() (* (SSL_METHOD * (*)(void)) ssl_sw[9].ptr)()
#define SSL_library_init() (* (int (*)(void)) ssl_sw[10].ptr)()
#define SSL_CTX_use_PrivateKey_file(x,y,z) (* (int (*)(SSL_CTX *, \
const char *, int)) ssl_sw[11].ptr)((x), (y), (z))
#define SSL_CTX_use_certificate_file(x,y,z) (* (int (*)(SSL_CTX *, \
const char *, int)) ssl_sw[12].ptr)((x), (y), (z))
#define SSL_CTX_set_default_passwd_cb(x,y) \
(* (void (*)(SSL_CTX *, mg_callback_t)) ssl_sw[13].ptr)((x),(y))
#define SSL_CTX_free(x) (* (void (*)(SSL_CTX *)) ssl_sw[14].ptr)(x)
#define ERR_get_error() (* (unsigned long (*)(void)) ssl_sw[15].ptr)()
#define ERR_error_string(x, y) (* (char * (*)(unsigned long, char *)) ssl_sw[16].ptr)((x), (y))
#define SSL_load_error_strings() (* (void (*)(void)) ssl_sw[17].ptr)()
#define CRYPTO_num_locks() (* (int (*)(void)) crypto_sw[0].ptr)()
#define CRYPTO_set_locking_callback(x) \
(* (void (*)(void (*)(int, int, const char *, int))) \
crypto_sw[1].ptr)(x)
#define CRYPTO_set_id_callback(x) \
(* (void (*)(unsigned long (*)(void))) crypto_sw[2].ptr)(x)
/*
* set_ssl_option() function updates this array.
* It loads SSL library dynamically and changes NULLs to the actual addresses
* of respective functions. The macros above (like SSL_connect()) are really
* just calling these functions indirectly via the pointer.
*/
static struct ssl_func ssl_sw[] = {
{"SSL_free", NULL},
{"SSL_accept", NULL},
{"SSL_connect", NULL},
{"SSL_read", NULL},
{"SSL_write", NULL},
{"SSL_get_error", NULL},
{"SSL_set_fd", NULL},
{"SSL_new", NULL},
{"SSL_CTX_new", NULL},
{"SSLv23_server_method", NULL},
{"SSL_library_init", NULL},
{"SSL_CTX_use_PrivateKey_file", NULL},
{"SSL_CTX_use_certificate_file",NULL},
{"SSL_CTX_set_default_passwd_cb",NULL},
{"SSL_CTX_free", NULL},
{"ERR_get_error", NULL},
{"ERR_error_string", NULL},
{"SSL_load_error_strings", NULL},
{NULL, NULL}
};
/*
* Similar array as ssl_sw. These functions could be located in different lib.
*/
static struct ssl_func crypto_sw[] = {
{"CRYPTO_num_locks", NULL},
{"CRYPTO_set_locking_callback", NULL},
{"CRYPTO_set_id_callback", NULL},
{NULL, NULL}
};
/*
* Month names
*/
static const char *month_names[] = {
"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
};
/*
* Unified socket address. For IPv6 support, add IPv6 address structure
* in the union u.
*/
struct usa {
socklen_t len;
union {
struct sockaddr sa;
struct sockaddr_in sin;
} u;
};
/*
* Specifies a string (chunk of memory).
* Used to traverse comma separated lists of options.
*/
struct vec {
const char *ptr;
size_t len;
};
/*
* Structure used by mg_stat() function. Uses 64 bit file length.
*/
struct mgstat {
bool_t is_directory; /* Directory marker */
int64_t size; /* File size */
time_t mtime; /* Modification time */
};
/*
* Structure used to describe listening socket, or socket which was
* accept()-ed by the master thread and queued for future handling
* by the worker thread.
*/
struct socket {
struct socket *next; /* Linkage */
SOCKET sock; /* Listening socket */
struct usa lsa; /* Local socket address */
struct usa rsa; /* Remote socket address */
bool_t is_ssl; /* Is socket SSL-ed */
};
/*
* Mongoose context
*/
struct mg_context {
int stop_flag; /* Should we stop event loop */
SSL_CTX *ssl_ctx; /* SSL context */
const struct mg_config *config; /* Mongoose configuration */
struct socket *listening_sockets;
int num_threads; /* Number of threads */
int num_idle; /* Number of idle threads */
pthread_mutex_t mutex; /* Protects (max|num)_threads */
pthread_cond_t thr_cond; /* Condvar for thread sync */
struct socket queue[20]; /* Accepted sockets */
int sq_head; /* Head of the socket queue */
int sq_tail; /* Tail of the socket queue */
pthread_cond_t empty_cond; /* Socket queue empty condvar */
pthread_cond_t full_cond; /* Socket queue full condvar */
};
/*
* Client connection.
*/
struct mg_connection {
struct mg_request_info request_info;
struct mg_context *ctx; /* Mongoose context we belong to*/
SSL *ssl; /* SSL descriptor */
struct socket client; /* Connected client */
time_t birth_time; /* Time connection was accepted */
bool_t free_post_data; /* post_data was malloc-ed */
int64_t num_bytes_sent; /* Total bytes sent to client */
};
/*
* Print error message to the opened error log stream.
*/
static void
cry(struct mg_connection *conn, const char *fmt, ...)
{
char buf[BUFSIZ];
mg_callback_t log_callback;
enum mg_error_t processed = MG_ERROR;
va_list ap;
FILE *fp;
time_t timestamp;
va_start(ap, fmt);
(void) vsnprintf(buf, sizeof(buf), fmt, ap);
va_end(ap);
/*
* Do not lock when getting the callback value, here and below.
* I suppose this is fine, since function cannot disappear in the
* same way string option can.
*/
log_callback = conn->ctx->config->event_log_handler;
conn->request_info.log_message = buf;
if (log_callback != NULL)
processed = log_callback(conn, &conn->request_info);
if (processed == MG_ERROR) {
fp = conn->ctx->config->error_log_file == NULL ? stderr :
mg_fopen(conn->ctx->config->error_log_file, "a+");
if (fp != NULL) {
flockfile(fp);
timestamp = time(NULL);
(void) fprintf(fp,
"[%010lu] [error] [client %s] ",
(unsigned long) timestamp,
inet_ntoa(conn->client.rsa.u.sin.sin_addr));
if (conn->request_info.request_method != NULL)
(void) fprintf(fp, "%s %s: ",
conn->request_info.request_method,
conn->request_info.uri);
(void) fprintf(fp, "%s", buf);
fputc('\n', fp);
funlockfile(fp);
if (fp != stderr)
fclose(fp);
}
}
conn->request_info.log_message = NULL;
}
/*
* Print OpenSSL error messages, if any, to the error log.
*/
static void ssl_cry(struct mg_connection *conn, const char *fmt, ...) {
char buf[BUFSIZ];
unsigned long err;
va_list ap;
/* Log Mongoose message */
va_start(ap, fmt);
(void) vsnprintf(buf, sizeof(buf), fmt, ap);
va_end(ap);
cry(conn, buf);
/* Loop through any unlogged OpenSSL errors */
while ((err = ERR_get_error()) != 0) {
cry(conn, " --> OpenSSL: %s", ERR_error_string(err, NULL));
}
}
/*
* Return fake connection structure. Used for logging, if connection
* is not applicable at the moment of logging.
*/
static struct mg_connection *
fc(struct mg_context *ctx)
{
static struct mg_connection fake_connection;
fake_connection.ctx = ctx;
return (&fake_connection);
}
const char *
mg_version(void)
{
return (MONGOOSE_VERSION);
}
static void
mg_strlcpy(register char *dst, register const char *src, size_t n)
{
for (; *src != '\0' && n > 1; n--)
*dst++ = *src++;
*dst = '\0';
}
static int
lowercase(const char *s)
{
return (tolower(* (unsigned char *) s));
}
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);
}
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 char *
mg_strndup(const char *ptr, size_t len)
{
char *p;
if ((p = (char *) malloc(len + 1)) != NULL)
mg_strlcpy(p, ptr, len + 1);
return (p);
}
static char *
mg_strdup(const char *str)
{
return (mg_strndup(str, strlen(str)));
}
/*
* Like snprintf(), but never returns negative value, or the value
* that is larger than a supplied buffer.
* Thanks to Adam Zeldis to pointing snprintf()-caused vulnerability
* in his audit report.
*/
static int
mg_vsnprintf(struct mg_connection *conn,
char *buf, size_t buflen, const char *fmt, va_list ap)
{
int n;
if (buflen == 0)
return (0);
n = vsnprintf(buf, buflen, fmt, ap);
if (n < 0) {
cry(conn, "vsnprintf error");
n = 0;
} else if (n >= (int) buflen) {
cry(conn, "truncating vsnprintf buffer: [%.*s]",
n > 200 ? 200 : n, buf);
n = (int) buflen - 1;
}
buf[n] = '\0';
return (n);
}
static int
mg_snprintf(struct mg_connection *conn,
char *buf, size_t buflen, const char *fmt, ...)
{
va_list ap;
int n;
va_start(ap, fmt);
n = mg_vsnprintf(conn, buf, buflen, fmt, ap);
va_end(ap);
return (n);
}
/*
* 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);
}
/*
* Return HTTP header value, or NULL if not found.
*/
static const char *
get_header(const struct mg_request_info *ri, const char *name)
{
int i;
for (i = 0; i < ri->num_headers; i++)
if (!mg_strcasecmp(name, ri->http_headers[i].name))
return (ri->http_headers[i].value);
return (NULL);
}
const char *
mg_get_header(const struct mg_connection *conn, const char *name)
{
return (get_header(&conn->request_info, name));
}
/*
* A helper function for traversing comma separated list of values.
* It returns a list pointer shifted to the next value, of 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 = 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);
}
#if !(defined(NO_CGI) && defined(NO_SSI))
/*
* Verify that given file has certain extension
*/
static bool_t
match_extension(const char *path, const char *ext_list)
{
struct vec ext_vec;
size_t path_len;
path_len = strlen(path);
while ((ext_list = next_option(ext_list, &ext_vec, NULL)) != NULL)
if (ext_vec.len < path_len &&
mg_strncasecmp(path + path_len - ext_vec.len,
ext_vec.ptr, ext_vec.len) == 0)
return (TRUE);
return (FALSE);
}
#endif /* !(NO_CGI && NO_SSI) */
/*
* Send error message back to the client.
*/
static void
send_error(struct mg_connection *conn, int status, const char *reason,
const char *fmt, ...)
{
char buf[BUFSIZ];
va_list ap;
int len;
mg_callback_t error_handler;
bool_t handled;
DEBUG_TRACE((DEBUG_MGS_PREFIX "%s: %d %s", __func__, status, reason));
conn->request_info.status_code = status;
error_handler = conn->ctx->config->http_error_handler;
handled = error_handler ?
error_handler(conn, &conn->request_info) : FALSE;
if (handled == FALSE) {
buf[0] = '\0';
len = 0;
/* Errors 1xx, 204 and 304 MUST NOT send a body */
if (status > 199 && status != 204 && status != 304) {
len = mg_snprintf(conn, buf, sizeof(buf),
"Error %d: %s\n", status, reason);
cry(conn, "%s", buf);
va_start(ap, fmt);
len += mg_vsnprintf(conn, buf + len, sizeof(buf) - len,
fmt, ap);
va_end(ap);
conn->num_bytes_sent = len;
}
(void) mg_printf(conn,
"HTTP/1.1 %d %s\r\n"
"Content-Type: text/plain\r\n"
"Content-Length: %d\r\n"
"Connection: close\r\n"
"\r\n%s", status, reason, len, buf);
}
}
#ifdef _WIN32
static int
pthread_mutex_init(pthread_mutex_t *mutex, void *unused)
{
unused = NULL;
*mutex = CreateMutex(NULL, FALSE, NULL);
return (*mutex == NULL ? -1 : 0);
}
static int
pthread_mutex_destroy(pthread_mutex_t *mutex)
{
return (CloseHandle(*mutex) == 0 ? -1 : 0);
}
static int
pthread_mutex_lock(pthread_mutex_t *mutex)
{
return (WaitForSingleObject(*mutex, INFINITE) == WAIT_OBJECT_0? 0 : -1);
}
static int
pthread_mutex_unlock(pthread_mutex_t *mutex)
{
return (ReleaseMutex(*mutex) == 0 ? -1 : 0);
}
static int
pthread_cond_init(pthread_cond_t *cv, const void *unused)
{
unused = NULL;
*cv = CreateEvent(NULL, FALSE, FALSE, NULL);
return (*cv == NULL ? -1 : 0);
}
static int
pthread_cond_timedwait(pthread_cond_t *cv, pthread_mutex_t *mutex,
const struct timespec *ts)
{
DWORD status;
DWORD msec = INFINITE;
time_t now;
if (ts != NULL) {
now = time(NULL);
msec = 1000 * (now > ts->tv_sec ? 0 : ts->tv_sec - now);
}
(void) ReleaseMutex(*mutex);
status = WaitForSingleObject(*cv, msec);
(void) WaitForSingleObject(*mutex, INFINITE);
return (status == WAIT_OBJECT_0 ? 0 : -1);
}
static int
pthread_cond_wait(pthread_cond_t *cv, pthread_mutex_t *mutex)
{
return (pthread_cond_timedwait(cv, mutex, NULL));
}
static int
pthread_cond_signal(pthread_cond_t *cv)
{
return (SetEvent(*cv) == 0 ? -1 : 0);
}
static int
pthread_cond_destroy(pthread_cond_t *cv)
{
return (CloseHandle(*cv) == 0 ? -1 : 0);
}
static pthread_t
pthread_self(void)
{
return (GetCurrentThreadId());
}
/*
* Change all slashes to backslashes. It is Windows.
*/
static void
fix_directory_separators(char *path)
{
int i;
for (i = 0; path[i] != '\0'; i++) {
if (path[i] == '/')
path[i] = '\\';
/* i > 0 check is to preserve UNC paths, \\server\file.txt */
if (path[i] == '\\' && i > 0)
while (path[i + 1] == '\\' || path[i + 1] == '/')
(void) memmove(path + i + 1,
path + i + 2, strlen(path + i + 1));
}
}
/*
* 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[FILENAME_MAX], *p;
mg_strlcpy(buf, path, sizeof(buf));
fix_directory_separators(buf);
/* Point p to the end of the file name */
p = buf + strlen(buf) - 1;
/* Trim trailing backslash character */
while (p > buf && *p == '\\' && p[-1] != ':')
*p-- = '\0';
/*
* Protect from CGI code disclosure.
* This is very nasty hole. Windows happily opens files with
* some garbage in the end of file name. So fopen("a.cgi ", "r")
* actually opens "a.cgi", and does not return an error!
*/
if (*p == 0x20 || /* No space at the end */
(*p == 0x2e && p > buf) || /* No '.' but allow '.' as full path */
*p == 0x2b || /* No '+' */
(*p & ~0x7f)) { /* And generally no non-ascii chars */
(void) fprintf(stderr, "Rejecting suspicious path: [%s]", buf);
buf[0] = '\0';
}
(void) MultiByteToWideChar(CP_UTF8, 0, buf, -1, wbuf, (int) wbuf_len);
}
#if defined(_WIN32_WCE)
static time_t
time(time_t *ptime)
{
time_t t;
SYSTEMTIME st;
FILETIME ft;
GetSystemTime(&st);
SystemTimeToFileTime(&st, &ft);
t = SYS2UNIX_TIME(ft.dwLowDateTime, ft.dwHighDateTime);
if (ptime != NULL)
*ptime = t;
return (t);
}
static time_t
mktime(struct tm *ptm)
{
SYSTEMTIME st;
FILETIME ft, lft;
st.wYear = ptm->tm_year + 1900;
st.wMonth = ptm->tm_mon + 1;
st.wDay = ptm->tm_mday;
st.wHour = ptm->tm_hour;
st.wMinute = ptm->tm_min;
st.wSecond = ptm->tm_sec;
st.wMilliseconds = 0;
SystemTimeToFileTime(&st, &ft);
LocalFileTimeToFileTime(&ft, &lft);
return (time_t)((MAKEUQUAD(lft.dwLowDateTime, lft.dwHighDateTime) -
EPOCH_DIFF) / RATE_DIFF);
}
static struct tm *
localtime(const time_t *ptime, struct tm *ptm)
{
int64_t t = ((int64_t)*ptime) * RATE_DIFF + EPOCH_DIFF;
FILETIME ft, lft;
SYSTEMTIME st;
TIME_ZONE_INFORMATION tzinfo;
if (ptm == NULL)
return NULL;
* (int64_t *) &ft = t;
FileTimeToLocalFileTime(&ft, &lft);
FileTimeToSystemTime(&lft, &st);
ptm->tm_year = st.wYear - 1900;
ptm->tm_mon = st.wMonth - 1;
ptm->tm_wday = st.wDayOfWeek;
ptm->tm_mday = st.wDay;
ptm->tm_hour = st.wHour;
ptm->tm_min = st.wMinute;
ptm->tm_sec = st.wSecond;
ptm->tm_yday = 0; // hope nobody uses this
ptm->tm_isdst = ((GetTimeZoneInformation(&tzinfo) ==
TIME_ZONE_ID_DAYLIGHT) ? 1 : 0);
return ptm;
}
static size_t
strftime(char *dst, size_t dst_size, const char *fmt, const struct tm *tm)
{
(void) snprintf(dst, dst_size, "implement strftime() for WinCE");
return (0);
}
#endif
static int
mg_rename(const char* oldname, const char* newname)
{
wchar_t woldbuf[FILENAME_MAX];
wchar_t wnewbuf[FILENAME_MAX];
to_unicode(oldname, woldbuf, ARRAY_SIZE(woldbuf));
to_unicode(newname, wnewbuf, ARRAY_SIZE(wnewbuf));
return (MoveFileW(woldbuf, wnewbuf) ? 0 : -1);
}
static FILE *
mg_fopen(const char *path, const char *mode)
{
wchar_t wbuf[FILENAME_MAX], wmode[20];
to_unicode(path, wbuf, ARRAY_SIZE(wbuf));
MultiByteToWideChar(CP_UTF8, 0, mode, -1, wmode, ARRAY_SIZE(wmode));
return (_wfopen(wbuf, wmode));
}
static int
mg_stat(const char *path, struct mgstat *stp)
{
int ok = -1; /* Error */
wchar_t wbuf[FILENAME_MAX];
WIN32_FILE_ATTRIBUTE_DATA info;
to_unicode(path, wbuf, ARRAY_SIZE(wbuf));
if (GetFileAttributesExW(wbuf, GetFileExInfoStandard, &info) != 0) {
stp->size = MAKEUQUAD(info.nFileSizeLow, info.nFileSizeHigh);
stp->mtime = SYS2UNIX_TIME(info.ftLastWriteTime.dwLowDateTime,
info.ftLastWriteTime.dwHighDateTime);
stp->is_directory =
info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY;
ok = 0; /* Success */
}
return (ok);
}
static int
mg_remove(const char *path)
{
wchar_t wbuf[FILENAME_MAX];
to_unicode(path, wbuf, ARRAY_SIZE(wbuf));
return (DeleteFileW(wbuf) ? 0 : -1);
}
static int
mg_mkdir(const char *path, int mode)
{
char buf[FILENAME_MAX];
wchar_t wbuf[FILENAME_MAX];
mode = 0; /* Unused */
mg_strlcpy(buf, path, sizeof(buf));
fix_directory_separators(buf);
(void) MultiByteToWideChar(CP_UTF8, 0, buf, -1, wbuf, sizeof(wbuf));
return (CreateDirectoryW(wbuf, NULL) ? 0 : -1);
}
/*
* Implementation of POSIX opendir/closedir/readdir for Windows.
*/
static DIR *
opendir(const char *name)
{
DIR *dir = NULL;
wchar_t wpath[FILENAME_MAX];
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);
}
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);
}
#define set_close_on_exec(fd) /* No FD_CLOEXEC on Windows */
static int
start_thread(struct mg_context *ctx, mg_thread_func_t func, void *param)
{
HANDLE hThread;
ctx = NULL; /* Unused */
hThread = CreateThread(NULL, 0,
(LPTHREAD_START_ROUTINE) func, param, 0, NULL);
if (hThread != NULL)
(void) CloseHandle(hThread);
return (hThread == NULL ? -1 : 0);
}
static HANDLE
dlopen(const char *dll_name, int flags)
{
wchar_t wbuf[FILENAME_MAX];
flags = 0; /* Unused */
to_unicode(dll_name, wbuf, ARRAY_SIZE(wbuf));
return (LoadLibraryW(wbuf));
}
#if !defined(NO_CGI)
static int
kill(pid_t pid, int sig_num)
{
(void) TerminateProcess(pid, sig_num);
(void) CloseHandle(pid);
return (0);
}
static pid_t
spawn_process(struct mg_connection *conn, const char *prog, char *envblk,
char *envp[], int fd_stdin, int fd_stdout, const char *dir)
{
HANDLE me;
char *p, *interp, cmdline[FILENAME_MAX], line[FILENAME_MAX];
FILE *fp;
STARTUPINFOA si;
PROCESS_INFORMATION pi;
envp = NULL; /* Unused */
(void) memset(&si, 0, sizeof(si));
(void) memset(&pi, 0, sizeof(pi));
/* XXX redirect CGI errors to the error log file */
si.cb = sizeof(si);
si.dwFlags = STARTF_USESTDHANDLES | STARTF_USESHOWWINDOW;
si.wShowWindow = SW_HIDE;
me = GetCurrentProcess();
(void) DuplicateHandle(me, (HANDLE) _get_osfhandle(fd_stdin), me,
&si.hStdInput, 0, TRUE, DUPLICATE_SAME_ACCESS);
(void) DuplicateHandle(me, (HANDLE) _get_osfhandle(fd_stdout), me,
&si.hStdOutput, 0, TRUE, DUPLICATE_SAME_ACCESS);
/* If CGI file is a script, try to read the interpreter line */
interp = conn->ctx->options[OPT_CGI_INTERPRETER];
if (interp == NULL) {
line[2] = '\0';
(void) mg_snprintf(conn, cmdline, sizeof(cmdline), "%s%c%s",
dir, DIRSEP, prog);
if ((fp = fopen(cmdline, "r")) != NULL) {
(void) fgets(line, sizeof(line), fp);
if (memcmp(line, "#!", 2) != 0)
line[2] = '\0';
/* Trim whitespaces from interpreter name */
for (p = &line[strlen(line) - 1]; p > line &&
isspace(*p); p--)
*p = '\0';
(void) fclose(fp);
}
interp = line + 2;
}
if ((p = (char *) strrchr(prog, '/')) != NULL)
prog = p + 1;
(void) mg_snprintf(conn, cmdline, sizeof(cmdline), "%s%s%s",
interp, interp[0] == '\0' ? "" : " ", prog);
(void) mg_snprintf(conn, line, sizeof(line), "%s", dir);
fix_directory_separators(line);
DEBUG_TRACE((DEBUG_MGS_PREFIX "%s: Running [%s]", __func__, cmdline));
if (CreateProcessA(NULL, cmdline, NULL, NULL, TRUE,
CREATE_NEW_PROCESS_GROUP, envblk, line, &si, &pi) == 0) {
cry(conn, "%s: CreateProcess(%s): %d",
__func__, cmdline, ERRNO);
pi.hProcess = (pid_t) -1;
} else {
(void) close(fd_stdin);
(void) close(fd_stdout);
}
(void) CloseHandle(si.hStdOutput);
(void) CloseHandle(si.hStdInput);
(void) CloseHandle(pi.hThread);
return ((pid_t) pi.hProcess);
}
static int
pipe(int *fds)
{
return (_pipe(fds, BUFSIZ, _O_BINARY));
}
#endif /* !NO_CGI */
static int
set_non_blocking_mode(struct mg_connection *conn, SOCKET sock)
{
unsigned long on = 1;
conn = NULL; /* unused */
return (ioctlsocket(sock, FIONBIO, &on));
}
#else
static int
mg_stat(const char *path, struct mgstat *stp)
{
struct stat st;
int ok;
if (stat(path, &st) == 0) {
ok = 0;
stp->size = st.st_size;
stp->mtime = st.st_mtime;
stp->is_directory = S_ISDIR(st.st_mode);
} else {
ok = -1;
}
return (ok);
}
static void
set_close_on_exec(int fd)
{
(void) fcntl(fd, F_SETFD, FD_CLOEXEC);
}
static int
start_thread(struct mg_context *ctx, mg_thread_func_t func, void *param)
{
pthread_t thread_id;
pthread_attr_t attr;
int retval;
(void) pthread_attr_init(&attr);
(void) pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
(void) pthread_attr_setstacksize(&attr,
sizeof(struct mg_connection) * 2);
if ((retval = pthread_create(&thread_id, &attr, func, param)) != 0)
cry(fc(ctx), "%s: %s", __func__, strerror(retval));
return (retval);
}
#ifndef NO_CGI
static pid_t
spawn_process(struct mg_connection *conn, const char *prog, char *envblk,
char *envp[], int fd_stdin, int fd_stdout, const char *dir)
{
pid_t pid;
const char *interp;
envblk = NULL; /* unused */
if ((pid = fork()) == -1) {
/* Parent */
send_error(conn, 500, http_500_error,
"fork(): %s", strerror(ERRNO));
} else if (pid == 0) {
/* Child */
if (chdir(dir) != 0) {
cry(conn, "%s: chdir(%s): %s",
__func__, dir, strerror(ERRNO));
} else if (dup2(fd_stdin, 0) == -1) {
cry(conn, "%s: dup2(stdin, %d): %s",
__func__, fd_stdin, strerror(ERRNO));
} else if (dup2(fd_stdout, 1) == -1) {
cry(conn, "%s: dup2(stdout, %d): %s",
__func__, fd_stdout, strerror(ERRNO));
} else {
(void) dup2(fd_stdout, 2);
(void) close(fd_stdin);
(void) close(fd_stdout);
/* Execute CGI program. No need to lock: new process */
interp = conn->ctx->config->cgi_interpreter;
if (interp == NULL) {
(void) execle(prog, prog, NULL, envp);
cry(conn, "%s: execle(%s): %s",
__func__, prog, strerror(ERRNO));
} else {
(void) execle(interp, interp, prog, NULL, envp);
cry(conn, "%s: execle(%s %s): %s",
__func__, interp, prog, strerror(ERRNO));
}
}
exit(EXIT_FAILURE);
} else {
/* Parent. Close stdio descriptors */
(void) close(fd_stdin);
(void) close(fd_stdout);
}
return (pid);
}
#endif /* !NO_CGI */
static int
set_non_blocking_mode(struct mg_connection *conn, SOCKET sock)
{
int flags, ok = -1;
if ((flags = fcntl(sock, F_GETFL, 0)) == -1) {
cry(conn, "%s: fcntl(F_GETFL): %d", __func__, ERRNO);
} else if (fcntl(sock, F_SETFL, flags | O_NONBLOCK) != 0) {
cry(conn, "%s: fcntl(F_SETFL): %d", __func__, ERRNO);
} else {
ok = 0; /* Success */
}
return (ok);
}
#endif /* _WIN32 */
/*
* Write data to the IO channel - opened file descriptor, socket or SSL
* descriptor. Return number of bytes written.
*/
static int64_t
push(FILE *fp, SOCKET sock, SSL *ssl, const char *buf, int64_t len)
{
int64_t sent;
int n, k;
sent = 0;
while (sent < len) {
/* How many bytes we send in this iteration */
k = len - sent > INT_MAX ? INT_MAX : (int) (len - sent);
if (ssl != NULL) {
n = SSL_write(ssl, buf + sent, k);
} else if (fp != NULL) {
n = fwrite(buf + sent, 1, k, fp);
if (ferror(fp))
n = -1;
} else {
n = send(sock, buf + sent, k, 0);
}
if (n < 0)
break;
sent += n;
}
return (sent);
}
/*
* Read from IO channel - opened file descriptor, socket, or SSL descriptor.
* Return number of bytes read.
*/
static int
pull(FILE *fp, SOCKET sock, SSL *ssl, char *buf, int len)
{
int nread;
if (ssl != NULL) {
nread = SSL_read(ssl, buf, len);
} else if (fp != NULL) {
nread = fread(buf, 1, (size_t) len, fp);
if (ferror(fp))
nread = -1;
} else {
nread = recv(sock, buf, (size_t) len, 0);
}
return (nread);
}
int
mg_write(struct mg_connection *conn, const void *buf, size_t len)
{
return ((int) push(NULL, conn->client.sock, conn->ssl,
(const char *) buf, (int64_t) len));
}
int
mg_printf(struct mg_connection *conn, const char *fmt, ...)
{
char buf[MAX_REQUEST_SIZE];
int len;
va_list ap;
va_start(ap, fmt);
len = mg_vsnprintf(conn, buf, sizeof(buf), fmt, ap);
va_end(ap);
return (mg_write(conn, buf, len));
}
/*
* Return content length of the request, or -1 constant if
* Content-Length header is not set.
*/
static int64_t
get_content_length(const struct mg_connection *conn)
{
const char *cl = mg_get_header(conn, "Content-Length");
return (cl == NULL ? -1 : strtoll(cl, NULL, 10));
}
/*
* URL-decode input buffer into destination buffer.
* 0-terminate the destination buffer. Return the length of decoded data.
* form-url-encoded data differs from URI encoding in a way that it
* uses '+' as character for space, see RFC 1866 section 8.2.1
* http://ftp.ics.uci.edu/pub/ietf/html/rfc1866.txt
*/
static size_t
url_decode(const char *src, size_t src_len, char *dst, size_t dst_len,
bool_t is_form_url_encoded)
{
size_t i, j;
int 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] == '%' &&
isxdigit(* (unsigned char *) (src + i + 1)) &&
isxdigit(* (unsigned char *) (src + i + 2))) {
a = tolower(* (unsigned char *) (src + i + 1));
b = tolower(* (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 (j);
}
/*
* Scan given buffer and fetch the value of the given variable.
* It can be specified in query string, or in the POST data.
* Return NULL if the variable not found, or allocated 0-terminated value.
* It is caller's responsibility to free the returned value.
*/
enum mg_error_t
mg_get_var(const char *buf, size_t buf_len, const char *var_name,
char *var_value, size_t var_value_len)
{
const char *p, *e, *s;
char *val;
size_t var_len, len;
enum mg_error_t ret_val;
var_len = strlen(var_name);
e = buf + buf_len;
val = NULL;
ret_val = MG_NOT_FOUND;
var_value[0] = '\0';
/* buf is "var1=val1&var2=val2...". Find variable first */
for (p = buf; p + var_len < e; p++)
if ((p == buf || p[-1] == '&') && p[var_len] == '=' &&
!mg_strncasecmp(var_name, p, var_len)) {
/* Point p to variable value */
p += var_len + 1;
/* Point s to the end of the value */
s = (const char *) memchr(p, '&', e - p);
if (s == NULL)
s = e;
/* Try to allocate the buffer */
len = s - p;
if (len >= var_value_len) {
ret_val = MG_BUFFER_TOO_SMALL;
} else {
url_decode(p, len, var_value, len + 1, TRUE);
ret_val = MG_SUCCESS;
}
break;
}
return (ret_val);
}
enum mg_error_t
mg_get_qsvar(const struct mg_request_info *ri, const char *var_name,
char *var_value, size_t var_value_len) {
return (ri->query_string == NULL ? MG_NOT_FOUND : mg_get_var(ri->query_string,
strlen(ri->query_string), var_name, var_value, var_value_len));
}
enum mg_error_t
mg_get_cookie(const struct mg_connection *conn,
const char *cookie_name, char *dst, size_t dst_size)
{
const char *s, *p, *end;
int len;
dst[0] = '\0';
if ((s = mg_get_header(conn, "Cookie")) == NULL)
return (MG_NOT_FOUND);
len = strlen(cookie_name);
end = s + strlen(s);
for (; (s = strstr(s, cookie_name)) != NULL; s += len)
if (s[len] == '=') {
s += len + 1;
if ((p = strchr(s, ' ')) == NULL)
p = end;
if (p[-1] == ';')
p--;
if (*s == '"' && p[-1] == '"' && p > s + 1) {
s++;
p--;
}
if ((size_t) (p - s) >= dst_size) {
return (MG_BUFFER_TOO_SMALL);
} else {
mg_strlcpy(dst, s, (p - s) + 1);
return (MG_SUCCESS);
}
}
return (MG_NOT_FOUND);
}
/*
* Get document root for the given URI.
*/
static int
get_document_root(const struct mg_connection *conn, struct vec *document_root)
{
const char *root, *uri;
int len_of_matched_uri;
struct vec uri_vec, path_vec;
uri = conn->request_info.uri;
len_of_matched_uri = 0;
root = next_option(conn->ctx->config->document_root,
document_root, NULL);
while ((root = next_option(root, &uri_vec, &path_vec)) != NULL) {
if (memcmp(uri, uri_vec.ptr, uri_vec.len) == 0) {
*document_root = path_vec;
len_of_matched_uri = uri_vec.len;
break;
}
}
return (len_of_matched_uri);
}
/*
* Transform URI to the file name.
*/
static void
convert_uri_to_file_name(struct mg_connection *conn, const char *uri,
char *buf, size_t buf_len)
{
struct vec vec;
int match_len;
match_len = get_document_root(conn, &vec);
(void) mg_snprintf(conn, buf, buf_len, "%.*s%s",
vec.len, vec.ptr, uri + match_len);
#ifdef _WIN32
fix_directory_separators(buf);
#endif /* _WIN32 */
DEBUG_TRACE((DEBUG_MGS_PREFIX "%s: [%s] -> [%s]", __func__, uri, buf));
}
/*
* Setup listening socket on given address, return socket.
* Address format: [local_ip_address:]port_number
*/
static SOCKET
mg_open_listening_port(struct mg_context *ctx, const char *str, struct usa *usa)
{
SOCKET sock;
int on = 1, a, b, c, d, port;
/* MacOS needs that. If we do not zero it, bind() will fail. */
(void) memset(usa, 0, sizeof(*usa));
if (sscanf(str, "%d.%d.%d.%d:%d", &a, &b, &c, &d, &port) == 5) {
/* IP address to bind to is specified */
usa->u.sin.sin_addr.s_addr =
htonl((a << 24) | (b << 16) | (c << 8) | d);
} else if (sscanf(str, "%d", &port) == 1) {
/* Only port number is specified. Bind to all addresses */
usa->u.sin.sin_addr.s_addr = htonl(INADDR_ANY);
} else {
return (INVALID_SOCKET);
}
usa->len = sizeof(usa->u.sin);
usa->u.sin.sin_family = AF_INET;
usa->u.sin.sin_port = htons((uint16_t) port);
if ((sock = socket(PF_INET, SOCK_STREAM, 6)) != INVALID_SOCKET &&
setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
(char *) &on, sizeof(on)) == 0 &&
bind(sock, &usa->u.sa, usa->len) == 0 &&
listen(sock, 20) == 0) {
/* Success */
set_close_on_exec(sock);
} else {
/* Error */
cry(fc(ctx), "%s(%d): %s", __func__, port, strerror(ERRNO));
if (sock != INVALID_SOCKET)
(void) closesocket(sock);
sock = INVALID_SOCKET;
}
return (sock);
}
/*
* 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 *buf, size_t buflen)
{
const char *s, *e;
int len = 0;
for (s = buf, e = s + buflen - 1; len <= 0 && s < e; s++)
/* Control characters are not allowed but >=128 is. */
if (!isprint(* (unsigned char *) s) && *s != '\r' &&
*s != '\n' && * (unsigned char *) s < 128)
len = -1;
else if (s[0] == '\n' && s[1] == '\n')
len = (int) (s - buf) + 2;
else if (s[0] == '\n' && &s[1] < e &&
s[1] == '\r' && s[2] == '\n')
len = (int) (s - buf) + 3;
return (len);
}
/*
* Convert month to the month number. Return -1 on error, or month number
*/
static int
montoi(const char *s)
{
size_t i;
for (i = 0; i < sizeof(month_names) / sizeof(month_names[0]); i++)
if (!strcmp(s, month_names[i]))
return ((int) i);
return (-1);
}
/*
* Parse date-time string, and return the corresponding time_t value
*/
static time_t
date_to_epoch(const char *s)
{
time_t current_time;
struct tm tm, *tmp;
char mon[32];
int sec, min, hour, mday, month, year;
(void) memset(&tm, 0, sizeof(tm));
sec = min = hour = mday = month = year = 0;
if (((sscanf(s, "%d/%3s/%d %d:%d:%d",
&mday, mon, &year, &hour, &min, &sec) == 6) ||
(sscanf(s, "%d %3s %d %d:%d:%d",
&mday, mon, &year, &hour, &min, &sec) == 6) ||
(sscanf(s, "%*3s, %d %3s %d %d:%d:%d",
&mday, mon, &year, &hour, &min, &sec) == 6) ||
(sscanf(s, "%d-%3s-%d %d:%d:%d",
&mday, mon, &year, &hour, &min, &sec) == 6)) &&
(month = montoi(mon)) != -1) {
tm.tm_mday = mday;
tm.tm_mon = month;
tm.tm_year = year;
tm.tm_hour = hour;
tm.tm_min = min;
tm.tm_sec = sec;
}
if (tm.tm_year > 1900)
tm.tm_year -= 1900;
else if (tm.tm_year < 70)
tm.tm_year += 100;
/* Set Daylight Saving Time field */
current_time = time(NULL);
tmp = localtime(&current_time);
tm.tm_isdst = tmp->tm_isdst;
return (mktime(&tm));
}
/*
* 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 and backslashes */
while (*s == '/' || *s == '\\')
s++;
/* Skip all double-dots */
while (*s == '.' && s[1] == '.')
s += 2;
}
}
*p = '\0';
}
/*
* Built-in mime types
*/
static const struct {
const char *extension;
size_t ext_len;
const char *mime_type;
size_t mime_type_len;
} mime_types[] = {
{".html", 5, "text/html", 9},
{".htm", 4, "text/html", 9},
{".shtm", 5, "text/html", 9},
{".shtml", 6, "text/html", 9},
{".css", 4, "text/css", 8},
{".js", 3, "application/x-javascript", 24},
{".ico", 4, "image/x-icon", 12},
{".gif", 4, "image/gif", 9},
{".jpg", 4, "image/jpeg", 10},
{".jpeg", 5, "image/jpeg", 10},
{".png", 4, "image/png", 9},
{".svg", 4, "image/svg+xml", 13},
{".torrent", 8, "application/x-bittorrent", 24},
{".wav", 4, "audio/x-wav", 11},
{".mp3", 4, "audio/x-mp3", 11},
{".mid", 4, "audio/mid", 9},
{".m3u", 4, "audio/x-mpegurl", 15},
{".ram", 4, "audio/x-pn-realaudio", 20},
{".xml", 4, "text/xml", 8},
{".xslt", 5, "application/xml", 15},
{".ra", 3, "audio/x-pn-realaudio", 20},
{".doc", 4, "application/msword", 19},
{".exe", 4, "application/octet-stream", 24},
{".zip", 4, "application/x-zip-compressed", 28},
{".xls", 4, "application/excel", 17},
{".tgz", 4, "application/x-tar-gz", 20},
{".tar", 4, "application/x-tar", 17},
{".gz", 3, "application/x-gunzip", 20},
{".arj", 4, "application/x-arj-compressed", 28},
{".rar", 4, "application/x-arj-compressed", 28},
{".rtf", 4, "application/rtf", 15},
{".pdf", 4, "application/pdf", 15},
{".swf", 4, "application/x-shockwave-flash",29},
{".mpg", 4, "video/mpeg", 10},
{".mpeg", 5, "video/mpeg", 10},
{".asf", 4, "video/x-ms-asf", 14},
{".avi", 4, "video/x-msvideo", 15},
{".bmp", 4, "image/bmp", 9},
{NULL, 0, NULL, 0}
};
/*
* Look at the "path" extension and figure what mime type it has.
* Store mime type in the vector.
*/
static void
get_mime_type(struct mg_context *ctx, const char *path, struct vec *vec)
{
struct vec ext_vec, mime_vec;
const char *list, *ext;
size_t i, path_len;
path_len = strlen(path);
/*
* Scan user-defined mime types first, in case user wants to
* override default mime types.
*/
list = ctx->config->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;
}
}
/* Now scan built-in mime types */
for (i = 0; mime_types[i].extension != NULL; i++) {
ext = path + (path_len - mime_types[i].ext_len);
if (path_len > mime_types[i].ext_len &&
mg_strcasecmp(ext, mime_types[i].extension) == 0) {
vec->ptr = mime_types[i].mime_type;
vec->len = mime_types[i].mime_type_len;
return;
}
}
/* Nothing found. Fall back to text/plain */
vec->ptr = "text/plain";
vec->len = 10;
}
#ifndef HAVE_MD5
typedef struct MD5Context {
uint32_t buf[4];
uint32_t bits[2];
unsigned char in[64];
} MD5_CTX;
#if __BYTE_ORDER == 1234
#define byteReverse(buf, len) /* Nothing */
#else
/*
* Note: this code is harmless on little-endian machines.
*/
static void
byteReverse(unsigned char *buf, unsigned longs)
{
uint32_t t;
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);
}
#endif /* __BYTE_ORDER */
/* The four core functions - F1 is optimized somewhat */
/* #define F1(x, y, z) (x & y | ~x & z) */
#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))
/* This is the central step in the MD5 algorithm. */
#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;
}
/*
* The core of the MD5 algorithm, this alters an existing MD5 hash to
* reflect the addition of 16 longwords of new data. MD5Update blocks
* the data and converts bytes into longwords for this routine.
*/
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;
}
/*
* Update context to reflect the concatenation of another buffer full
* of bytes.
*/
static void
MD5Update(MD5_CTX *ctx, unsigned char const *buf, unsigned len)
{
uint32_t t;
/* Update bitcount */
t = ctx->bits[0];
if ((ctx->bits[0] = t + ((uint32_t) len << 3)) < t)
ctx->bits[1]++; /* Carry from low to high */
ctx->bits[1] += len >> 29;
t = (t >> 3) & 0x3f; /* Bytes already in shsInfo->data */
/* Handle any leading odd-sized chunks */
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;
}
/* Process data in 64-byte chunks */
while (len >= 64) {
memcpy(ctx->in, buf, 64);
byteReverse(ctx->in, 16);
MD5Transform(ctx->buf, (uint32_t *) ctx->in);
buf += 64;
len -= 64;
}
/* Handle any remaining bytes of data. */
memcpy(ctx->in, buf, len);
}
/*
* Final wrapup - pad to 64-byte boundary with the bit pattern
* 1 0* (64-bit count of bits processed, MSB-first)
*/
static void
MD5Final(unsigned char digest[16], MD5_CTX *ctx)
{
unsigned count;
unsigned char *p;
/* Compute number of bytes mod 64 */
count = (ctx->bits[0] >> 3) & 0x3F;
/* Set the first char of padding to 0x80. This is safe since there is
always at least one byte free */
p = ctx->in + count;
*p++ = 0x80;
/* Bytes of padding needed to make 64 bytes */
count = 64 - 1 - count;
/* Pad out to 56 mod 64 */
if (count < 8) {
/* Two lots of padding: Pad the first block to 64 bytes */
memset(p, 0, count);
byteReverse(ctx->in, 16);
MD5Transform(ctx->buf, (uint32_t *) ctx->in);
/* Now fill the next block with 56 bytes */
memset(ctx->in, 0, 56);
} else {
/* Pad block to 56 bytes */
memset(p, 0, count - 8);
}
byteReverse(ctx->in, 14);
/* Append length in bits and transform */
((uint32_t *) ctx->in)[14] = ctx->bits[0];
((uint32_t *) ctx->in)[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)); /* In case it's sensitive */
}
#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 vectors.
* buf must point to 33-bytes long buffer
*/
void
mg_md5(char *buf, ...)
{
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, (unsigned char *) p, (int) strlen(p));
va_end(ap);
MD5Final(hash, &ctx);
bin2str(buf, hash, sizeof(hash));
}
/*
* Check the user's password, return 1 if OK
*/
static bool_t
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];
/* XXX Due to a bug in MSIE, we do not compare the URI */
/* Also, we do not check for authentication timeout */
if (/*strcmp(dig->uri, c->ouri) != 0 || */
strlen(response) != 32 /*||
now - strtoul(dig->nonce, NULL, 10) > 3600 */)
return (FALSE);
mg_md5(ha2, method, ":", uri, NULL);
mg_md5(expected_response, ha1, ":", nonce, ":", nc,
":", cnonce, ":", qop, ":", ha2, NULL);
return (mg_strcasecmp(response, expected_response) == 0);
}
/*
* 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 mg_connection *conn, const char *path)
{
struct mg_context *ctx = conn->ctx;
char name[FILENAME_MAX];
const char *p, *e;
struct mgstat st;
FILE *fp;
if (ctx->config->global_passwords_file != NULL) {
/* Use global passwords file */
fp = mg_fopen(ctx->config->global_passwords_file, "r");
if (fp == NULL)
cry(fc(ctx), "fopen(%s): %s",
ctx->config->global_passwords_file, strerror(ERRNO));
} else if (!mg_stat(path, &st) && st.is_directory) {
(void) mg_snprintf(conn, name, sizeof(name), "%s%c%s",
path, DIRSEP, PASSWORDS_FILE_NAME);
fp = mg_fopen(name, "r");
} else {
/*
* Try to find .htpasswd in requested directory.
* Given the path, create the path to .htpasswd file
* in the same directory. Find the right-most
* directory separator character first. That would be the
* directory name. If directory separator character is not
* found, 'e' will point to 'p'.
*/
for (p = path, e = p + strlen(p) - 1; e > p; e--)
if (IS_DIRSEP_CHAR(*e))
break;
/*
* Make up the path by concatenating directory name and
* .htpasswd file name.
*/
(void) mg_snprintf(conn, name, sizeof(name), "%.*s%c%s",
(int) (e - p), p, DIRSEP, PASSWORDS_FILE_NAME);
fp = mg_fopen(name, "r");
}
return (fp);
}
/*
* Parsed Authorization: header
*/
struct ah {
char *user, *uri, *cnonce, *response, *qop, *nc, *nonce;
};
static bool_t
parse_auth_header(struct mg_connection *conn, char *buf, size_t buf_size,
struct ah *ah)
{
char *name, *value, *s;
const char *auth_header;
if ((auth_header = mg_get_header(conn, "Authorization")) == NULL ||
mg_strncasecmp(auth_header, "Digest ", 7) != 0)
return (FALSE);
/* Make modifiable copy of the auth header */
(void) mg_strlcpy(buf, auth_header + 7, buf_size);
s = buf;
(void) memset(ah, 0, sizeof(*ah));
/* Gobble initial spaces */
while (isspace(* (unsigned char *) s))
s++;
/* Parse authorization header */
for (;;) {
name = skip(&s, "=");
value = skip(&s, " ");
/* Handle commas: Digest username="a", realm="b", ...*/
if (value[strlen(value) - 1] == ',')
value[strlen(value) - 1] = '\0';
/* Trim double quotes around values */
if (*value == '"') {
value++;
value[strlen(value) - 1] = '\0';
} else if (*value == '\0') {
break;
}
if (!strcmp(name, "username")) {
ah->user = value;
} else if (!strcmp(name, "cnonce")) {
ah->cnonce = value;
} else if (!strcmp(name, "response")) {
ah->response = value;
} else if (!strcmp(name, "uri")) {
ah->uri = value;
} else if (!strcmp(name, "qop")) {
ah->qop = value;
} else if (!strcmp(name, "nc")) {
ah->nc = value;
} else if (!strcmp(name, "nonce")) {
ah->nonce = value;
}
}
/* CGI needs it as REMOTE_USER */
if (ah->user != NULL)
conn->request_info.remote_user = mg_strdup(ah->user);
return (TRUE);
}
/*
* Authorize against the opened passwords file. Return 1 if authorized.
*/
static bool_t
authorize(struct mg_connection *conn, FILE *fp)
{
struct ah ah;
char line[256], f_user[256], ha1[256],
f_domain[256], buf[MAX_REQUEST_SIZE];
if (!parse_auth_header(conn, buf, sizeof(buf), &ah))
return (FALSE);
/* Loop over passwords file */
while (fgets(line, sizeof(line), fp) != NULL) {
if (sscanf(line, "%[^:]:%[^:]:%s", f_user, f_domain, ha1) != 3)
continue;
if (!strcmp(ah.user, f_user) &&
!strcmp(conn->ctx->config->auth_domain, f_domain))
return (check_password(
conn->request_info.request_method,
ha1, ah.uri, ah.nonce, ah.nc, ah.cnonce, ah.qop,
ah.response));
}
return (FALSE);
}
/*
* Return TRUE if request is authorised, FALSE otherwise.
*/
static bool_t
check_authorization(struct mg_connection *conn, const char *path)
{
FILE *fp;
char fname[FILENAME_MAX];
struct vec uri_vec, filename_vec;
const char *list;
bool_t authorized;
fp = NULL;
authorized = TRUE;
list = conn->ctx->config->protect;
while ((list = next_option(list, &uri_vec, &filename_vec)) != NULL) {
if (!memcmp(conn->request_info.uri, uri_vec.ptr, uri_vec.len)) {
(void) mg_snprintf(conn, fname, sizeof(fname), "%.*s",
filename_vec.len, filename_vec.ptr);
if ((fp = mg_fopen(fname, "r")) == NULL)
cry(conn, "%s: cannot open %s: %s",
__func__, fname, strerror(errno));
break;
}
}
if (fp == NULL)
fp = open_auth_file(conn, path);
if (fp != NULL) {
authorized = authorize(conn, fp);
(void) fclose(fp);
}
return (authorized);
}
static void
send_authorization_request(struct mg_connection *conn)
{
conn->request_info.status_code = 401;
(void) mg_printf(conn,
"HTTP/1.1 401 Unauthorized\r\n"
"WWW-Authenticate: Digest qop=\"auth\", "
"realm=\"%s\", nonce=\"%lu\"\r\n\r\n",
conn->ctx->config->auth_domain,
(unsigned long) time(NULL));
}
static bool_t
is_authorized_for_put(struct mg_connection *conn)
{
FILE *fp;
int ret = FALSE;
fp = conn->ctx->config->put_delete_passwords_file == NULL ? NULL :
mg_fopen(conn->ctx->config->put_delete_passwords_file, "r");
if (fp != NULL) {
ret = authorize(conn, fp);
(void) fclose(fp);
}
return (ret);
}
enum mg_error_t
mg_modify_passwords_file(struct mg_context *ctx, const char *fname,
const char *user, const char *pass)
{
int found;
char line[512], u[512], d[512], ha1[33], tmp[FILENAME_MAX];
const char *domain;
FILE *fp, *fp2;
found = 0;
fp = fp2 = NULL;
domain = ctx->config->auth_domain;
/* Regard empty password as no password - remove user record. */
if (pass[0] == '\0')
pass = NULL;
(void) snprintf(tmp, sizeof(tmp), "%s.tmp", fname);
/* Create the file if does not exist */
if ((fp = mg_fopen(fname, "a+")) != NULL)
(void) fclose(fp);
/* Open the given file and temporary file */
if ((fp = mg_fopen(fname, "r")) == NULL) {
cry(fc(ctx), "Cannot open %s: %s", fname, strerror(errno));
return (MG_ERROR);
} else if ((fp2 = mg_fopen(tmp, "w+")) == NULL) {
cry(fc(ctx), "Cannot open %s: %s", tmp, strerror(errno));
return (MG_ERROR);
}
/* Copy the stuff to temporary file */
while (fgets(line, sizeof(line), fp) != NULL) {
if (sscanf(line, "%[^:]:%[^:]:%*s", u, d) != 2)
continue;
if (!strcmp(u, user) && !strcmp(d, domain)) {
found++;
if (pass != NULL) {
mg_md5(ha1, user, ":", domain, ":", pass, NULL);
fprintf(fp2, "%s:%s:%s\n", user, domain, ha1);
}
} else {
(void) fprintf(fp2, "%s", line);
}
}
/* If new user, just add it */
if (!found && pass != NULL) {
mg_md5(ha1, user, ":", domain, ":", pass, NULL);
(void) fprintf(fp2, "%s:%s:%s\n", user, domain, ha1);
}
/* Close files */
(void) fclose(fp);
(void) fclose(fp2);
/* Put the temp file in place of real file */
(void) mg_remove(fname);
(void) mg_rename(tmp, fname);
return (MG_SUCCESS);
}
struct de {
struct mg_connection *conn;
char *file_name;
struct mgstat st;
};
static void
url_encode(const char *src, char *dst, size_t dst_len)
{
const char *dont_escape = "._-$,;~()";
const char *hex = "0123456789abcdef";
const char *end = dst + dst_len - 1;
for (; *src != '\0' && dst < end; src++, dst++) {
if (isalnum(*(unsigned char *) src) ||
strchr(dont_escape, * (unsigned char *) src) != NULL) {
*dst = *src;
} else if (dst + 2 < end) {
dst[0] = '%';
dst[1] = hex[(* (unsigned char *) src) >> 4];
dst[2] = hex[(* (unsigned char *) src) & 0xf];
dst += 2;
}
}
*dst = '\0';
}
/*
* This function is called from send_directory() and prints out
* single directory entry.
*/
static void
print_dir_entry(struct de *de)
{
char size[64], mod[64], href[FILENAME_MAX];
if (de->st.is_directory) {
(void) mg_snprintf(de->conn,
size, sizeof(size), "%s", "[DIRECTORY]");
} else {
/*
* We use (signed) cast below because MSVC 6 compiler cannot
* convert unsigned __int64 to double. Sigh.
*/
if (de->st.size < 1024)
(void) mg_snprintf(de->conn, size, sizeof(size),
"%lu", (unsigned long) de->st.size);
else if (de->st.size < 1024 * 1024)
(void) mg_snprintf(de->conn, size, sizeof(size),
"%.1fk", (double) de->st.size / 1024.0);
else if (de->st.size < 1024 * 1024 * 1024)
(void) mg_snprintf(de->conn, size, sizeof(size),
"%.1fM", (double) de->st.size / 1048576);
else
(void) mg_snprintf(de->conn, size, sizeof(size),
"%.1fG", (double) de->st.size / 1073741824);
}
(void) strftime(mod, sizeof(mod), "%d-%b-%Y %H:%M",
localtime(&de->st.mtime));
url_encode(de->file_name, href, sizeof(href));
de->conn->num_bytes_sent += mg_printf(de->conn,
"<tr><td><a href=\"%s%s%s\">%s%s</a></td>"
"<td>&nbsp;%s</td><td>&nbsp;&nbsp;%s</td></tr>\n",
de->conn->request_info.uri, href, de->st.is_directory ? "/" : "",
de->file_name, de->st.is_directory ? "/" : "", mod, size);
}
/*
* This function is called from send_directory() and used for
* sorting direcotory entries by size, or name, or modification time.
*/
static int
compare_dir_entries(const void *p1, const void *p2)
{
const struct de *a = (struct de *) p1, *b = (struct de *) p2;
const char *query_string = a->conn->request_info.query_string;
int cmp_result = 0;
if (query_string == NULL)
query_string = "na";
if (a->st.is_directory && !b->st.is_directory) {
return (-1); /* Always put directories on top */
} else if (!a->st.is_directory && b->st.is_directory) {
return (1); /* Always put directories on top */
} else if (*query_string == 'n') {
cmp_result = strcmp(a->file_name, b->file_name);
} else if (*query_string == 's') {
cmp_result = a->st.size == b->st.size ? 0 :
a->st.size > b->st.size ? 1 : -1;
} else if (*query_string == 'd') {
cmp_result = a->st.mtime == b->st.mtime ? 0 :
a->st.mtime > b->st.mtime ? 1 : -1;
}
return (query_string[1] == 'd' ? -cmp_result : cmp_result);
}
/*
* Send directory contents.
*/
static void
send_directory(struct mg_connection *conn, const char *dir)
{
struct dirent *dp;
DIR *dirp;
struct de *entries = NULL;
char path[FILENAME_MAX];
int i, sort_direction, num_entries = 0, arr_size = 128;
if ((dirp = opendir(dir)) == NULL) {
send_error(conn, 500, "Cannot open directory",
"Error: opendir(%s): %s", path, strerror(ERRNO));
return;
}
(void) mg_printf(conn, "%s",
"HTTP/1.1 200 OK\r\n"
"Connection: close\r\n"
"Content-Type: text/html; charset=utf-8\r\n\r\n");
sort_direction = conn->request_info.query_string != NULL &&
conn->request_info.query_string[1] == 'd' ? 'a' : 'd';
while ((dp = readdir(dirp)) != NULL) {
/* Do not show current dir and passwords file */
if (!strcmp(dp->d_name, ".") ||
!strcmp(dp->d_name, "..") ||
!strcmp(dp->d_name, PASSWORDS_FILE_NAME))
continue;
if (entries == NULL || num_entries >= arr_size) {
arr_size *= 2;
entries = (struct de *) realloc(entries,
arr_size * sizeof(entries[0]));
}
if (entries == NULL) {
send_error(conn, 500, "Cannot open directory",
"%s", "Error: cannot allocate memory");
return;
}
(void) mg_snprintf(conn, path, sizeof(path), "%s%c%s",
dir, DIRSEP, dp->d_name);
/*
* If we don't memset stat structure to zero, mtime will have
* garbage and strftime() will segfault later on in
* print_dir_entry(). memset is required only if mg_stat()
* fails. For more details, see
* http://code.google.com/p/mongoose/issues/detail?id=79
*/
if (mg_stat(path, &entries[num_entries].st) != 0)
(void) memset(&entries[num_entries].st, 0,
sizeof(entries[num_entries].st));
entries[num_entries].conn = conn;
entries[num_entries].file_name = mg_strdup(dp->d_name);
num_entries++;
}
(void) closedir(dirp);
conn->num_bytes_sent += mg_printf(conn,
"<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->request_info.uri, conn->request_info.uri,
sort_direction, sort_direction, sort_direction);
/* Print first entry - link to a parent directory */
conn->num_bytes_sent += mg_printf(conn,
"<tr><td><a href=\"%s%s\">%s</a></td>"
"<td>&nbsp;%s</td><td>&nbsp;&nbsp;%s</td></tr>\n",
conn->request_info.uri, "..", "Parent directory", "-", "-");
/* Sort and print directory entries */
qsort(entries, num_entries, sizeof(entries[0]), compare_dir_entries);
for (i = 0; i < num_entries; i++) {
print_dir_entry(&entries[i]);
free(entries[i].file_name);
}
free(entries);
conn->num_bytes_sent += mg_printf(conn, "%s", "</table></body></html>");
conn->request_info.status_code = 200;
}
/*
* Send len bytes from the opened file to the client.
*/
static void
send_opened_file_stream(struct mg_connection *conn, FILE *fp, int64_t len)
{
char buf[BUFSIZ];
int to_read, num_read, num_written;
while (len > 0) {
/* Calculate how much to read from the file in the buffer */
to_read = sizeof(buf);
if ((int64_t) to_read > len)
to_read = (int) len;
/* Read from file, exit the loop on error */
if ((num_read = fread(buf, 1, to_read, fp)) == 0)
break;
/* Send read bytes to the client, exit the loop on error */
if ((num_written = mg_write(conn, buf, num_read)) != num_read)
break;
/* Both read and were successful, adjust counters */
conn->num_bytes_sent += num_written;
len -= num_written;
}
}
static int
parse_range_header(const char *header, int64_t *a, int64_t *b)
{
return sscanf(header, "bytes=%" INT64_FMT "-%" INT64_FMT, a, b);
}
/*
* Send regular file contents.
*/
static void
send_file(struct mg_connection *conn, const char *path, struct mgstat *stp)
{
char date[64], lm[64], etag[64], range[64];
const char *fmt = "%a, %d %b %Y %H:%M:%S %Z", *msg = "OK", *hdr;
time_t curtime = time(NULL);
int64_t cl, r1, r2;
struct vec mime_vec;
FILE *fp;
int n;
get_mime_type(conn->ctx, path, &mime_vec);
cl = stp->size;
conn->request_info.status_code = 200;
range[0] = '\0';
if ((fp = mg_fopen(path, "rb")) == NULL) {
send_error(conn, 500, http_500_error,
"fopen(%s): %s", path, strerror(ERRNO));
return;
}
set_close_on_exec(fileno(fp));
/* If Range: header specified, act accordingly */
r1 = r2 = 0;
hdr = mg_get_header(conn, "Range");
if (hdr != NULL && (n = parse_range_header(hdr, &r1, &r2)) > 0) {
conn->request_info.status_code = 206;
(void) fseeko(fp, (off_t) r1, SEEK_SET);
cl = n == 2 ? r2 - r1 + 1: cl - r1;
(void) mg_snprintf(conn, range, sizeof(range),
"Content-Range: bytes "
"%" INT64_FMT "-%"
INT64_FMT "/%" INT64_FMT "\r\n",
r1, r1 + cl - 1, stp->size);
msg = "Partial Content";
}
/* Prepare Etag, Date, Last-Modified headers */
(void) strftime(date, sizeof(date), fmt, localtime(&curtime));
(void) strftime(lm, sizeof(lm), fmt, localtime(&stp->mtime));
(void) mg_snprintf(conn, etag, sizeof(etag), "%lx.%lx",
(unsigned long) stp->mtime, (unsigned long) stp->size);
(void) mg_printf(conn,
"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: close\r\n"
"Accept-Ranges: bytes\r\n"
"%s\r\n",
conn->request_info.status_code, msg, date, lm, etag,
mime_vec.len, mime_vec.ptr, cl, range);
if (strcmp(conn->request_info.request_method, "HEAD") != 0)
send_opened_file_stream(conn, fp, cl);
(void) fclose(fp);
}
/*
* Parse HTTP headers from the given buffer, advance buffer to the point
* where parsing stopped.
*/
static void
parse_http_headers(char **buf, struct mg_request_info *ri)
{
int i;
for (i = 0; i < (int) 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 bool_t
is_valid_http_method(const char *method)
{
return (!strcmp(method, "GET") ||
!strcmp(method, "POST") ||
!strcmp(method, "HEAD") ||
!strcmp(method, "PUT") ||
!strcmp(method, "DELETE"));
}
/*
* Parse HTTP request, fill in mg_request_info structure.
*/
static bool_t
parse_http_request(char *buf, struct mg_request_info *ri)
{
int success_code = FALSE;
ri->request_method = skip(&buf, " ");
ri->uri = skip(&buf, " ");
ri->http_version = skip(&buf, "\r\n");
if (is_valid_http_method(ri->request_method) &&
ri->uri[0] == '/' &&
strncmp(ri->http_version, "HTTP/", 5) == 0) {
ri->http_version += 5; /* Skip "HTTP/" */
parse_http_headers(&buf, ri);
success_code = TRUE;
}
return (success_code);
}
/*
* Keep reading the input (either opened file descriptor fd, or socket sock,
* or SSL descriptor ssl) into buffer buf, until \r\n\r\n appears in the
* buffer (which marks the end of HTTP request). Buffer buf may already
* have some data. The length of the data is stored in nread.
* Upon every read operation, increase nread by the number of bytes read.
*/
static int
read_request(FILE *fp, SOCKET sock, SSL *ssl, char *buf, int bufsiz, int *nread)
{
int n, request_len;
request_len = 0;
while (*nread < bufsiz && request_len == 0) {
n = pull(fp, sock, ssl, buf + *nread, bufsiz - *nread);
if (n <= 0) {
break;
} else {
*nread += n;
request_len = get_request_len(buf, (size_t) *nread);
}
}
return (request_len);
}
/*
* 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 bool_t
substitute_index_file(struct mg_connection *conn,
char *path, size_t path_len, struct mgstat *stp)
{
const char *list;
struct mgstat st;
struct vec filename_vec;
size_t n;
bool_t found;
n = strlen(path);
/*
* 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 && IS_DIRSEP_CHAR(path[n - 1]))
n--;
path[n] = DIRSEP;
/*
* 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
*/
list = conn->ctx->config->index_files;
found = FALSE;
while ((list = next_option(list, &filename_vec, NULL)) != NULL) {
/* Ignore too long entries that may overflow path buffer */
if (filename_vec.len > path_len - n)
continue;
/* Prepare full path to the index file */
(void) mg_strlcpy(path + n + 1,
filename_vec.ptr, filename_vec.len + 1);
/* Does it exist ? */
if (mg_stat(path, &st) == 0) {
/* Yes it does, break the loop */
*stp = st;
found = TRUE;
break;
}
}
/* If no index file exists, restore directory path */
if (found == FALSE)
path[n] = '\0';
return (found);
}
/*
* Return True if we should reply 304 Not Modified.
*/
static bool_t
is_not_modified(const struct mg_connection *conn, const struct mgstat *stp)
{
const char *ims = mg_get_header(conn, "If-Modified-Since");
return (ims != NULL && stp->mtime <= date_to_epoch(ims));
}
static bool_t
append_chunk(struct mg_request_info *ri, FILE *fp, const char *buf, int len)
{
bool_t ret_code = TRUE;
if (fp == NULL) {
/* TODO: check for NULL here */
ri->post_data = (char *) realloc(ri->post_data,
ri->post_data_len + len);
(void) memcpy(ri->post_data + ri->post_data_len, buf, len);
ri->post_data_len += len;
} else if (push(fp, INVALID_SOCKET,
NULL, buf, (int64_t) len) != (int64_t) len) {
ret_code = FALSE;
}
return (ret_code);
}
static bool_t
handle_request_body(struct mg_connection *conn, FILE *fp)
{
struct mg_request_info *ri = &conn->request_info;
const char *expect, *tmp;
int64_t content_len;
char buf[BUFSIZ];
int to_read, nread, already_read;
bool_t success_code = FALSE;
content_len = get_content_length(conn);
expect = mg_get_header(conn, "Expect");
if (content_len == -1) {
send_error(conn, 411, "Length Required", "");
} else if (expect != NULL && mg_strcasecmp(expect, "100-continue")) {
send_error(conn, 417, "Expectation Failed", "");
} else {
if (expect != NULL)
(void) mg_printf(conn, "HTTP/1.1 100 Continue\r\n\r\n");
already_read = ri->post_data_len;
assert(already_read >= 0);
if (content_len <= (int64_t) already_read) {
ri->post_data_len = (int) content_len;
/*
* If fp is NULL, this is embedded mode, and we do not
* have to do anything: POST data is already there,
* no need to allocate a buffer and copy it in.
* If fp != NULL, we need to write the data.
*/
success_code = fp == NULL || (push(fp, INVALID_SOCKET,
NULL, ri->post_data, content_len) == content_len) ?
TRUE : FALSE;
} else {
if (fp == NULL) {
conn->free_post_data = TRUE;
tmp = ri->post_data;
/* +1 in case if already_read == 0 */
ri->post_data = (char*)malloc(already_read + 1);
(void) memcpy(ri->post_data, tmp, already_read);
} else {
(void) push(fp, INVALID_SOCKET, NULL,
ri->post_data, (int64_t) already_read);
}
content_len -= already_read;
while (content_len > 0) {
to_read = sizeof(buf);
if ((int64_t) to_read > content_len)
to_read = (int) content_len;
nread = pull(NULL, conn->client.sock,
conn->ssl, buf, to_read);
if (nread <= 0)
break;
if (!append_chunk(ri, fp, buf, nread))
break;
content_len -= nread;
}
success_code = content_len == 0 ? TRUE : FALSE;
}
/* Each error code path in this function must send an error */
if (success_code != TRUE)
send_error(conn, 577, http_500_error,
"%s", "Error handling body data");
}
return (success_code);
}
#if !defined(NO_CGI)
/*
* 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 */
int len; /* Space taken */
char *vars[MAX_CGI_ENVIR_VARS]; /* char **envp */
int nvars; /* Number of variables */
};
/*
* 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(block->conn, added, (size_t) space, fmt, ap);
va_end(ap);
/* Make sure we do not overflow buffer and the envp array */
if (n > 0 && n < space &&
block->nvars < (int) ARRAY_SIZE(block->vars) - 2) {
/* Append a pointer to the added string into the envp array */
block->vars[block->nvars++] = block->buf + block->len;
/* Bump up used length counter. Include \0 terminator */
block->len += n + 1;
}
return (added);
}
static void
prepare_cgi_environment(struct mg_connection *conn, const char *prog,
struct cgi_env_block *blk)
{
const char *s, *script_filename, *slash;
struct vec var_vec, root;
char *p;
int i;
blk->len = blk->nvars = 0;
blk->conn = conn;
/* SCRIPT_FILENAME */
script_filename = prog;
if ((s = strrchr(prog, '/')) != NULL)
script_filename = s + 1;
get_document_root(conn, &root);
addenv(blk, "SERVER_NAME=%s", conn->ctx->config->auth_domain);
addenv(blk, "SERVER_ROOT=%.*s", root.len, root.ptr);
addenv(blk, "DOCUMENT_ROOT=%.*s", root.len, root.ptr);
/* 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"); /* PHP */
addenv(blk, "SERVER_PORT=%d", ntohs(conn->client.lsa.u.sin.sin_port));
addenv(blk, "REQUEST_METHOD=%s", conn->request_info.request_method);
addenv(blk, "REMOTE_ADDR=%s",
inet_ntoa(conn->client.rsa.u.sin.sin_addr));
addenv(blk, "REMOTE_PORT=%d", conn->request_info.remote_port);
addenv(blk, "REQUEST_URI=%s", conn->request_info.uri);
slash = strrchr(conn->request_info.uri, '/');
addenv(blk, "SCRIPT_NAME=%.*s%s",
(slash - conn->request_info.uri) + 1, conn->request_info.uri,
script_filename);
addenv(blk, "SCRIPT_FILENAME=%s", script_filename); /* PHP */
addenv(blk, "PATH_TRANSLATED=%s", prog);
addenv(blk, "HTTPS=%s", conn->ssl == NULL ? "off" : "on");
if ((s = mg_get_header(conn, "Content-Type")) != NULL)
addenv(blk, "CONTENT_TYPE=%s", s);
if (conn->request_info.query_string != NULL)
addenv(blk, "QUERY_STRING=%s", conn->request_info.query_string);
if ((s = mg_get_header(conn, "Content-Length")) != NULL)
addenv(blk, "CONTENT_LENGTH=%s", s);
if ((s = getenv("PATH")) != NULL)
addenv(blk, "PATH=%s", s);
#if defined(_WIN32)
if ((s = getenv("COMSPEC")) != NULL)
addenv(blk, "COMSPEC=%s", s);
if ((s = getenv("SYSTEMROOT")) != NULL)
addenv(blk, "SYSTEMROOT=%s", s);
#else
if ((s = getenv("LD_LIBRARY_PATH")) != NULL)
addenv(blk, "LD_LIBRARY_PATH=%s", s);
#endif /* _WIN32 */
if ((s = getenv("PERLLIB")) != NULL)
addenv(blk, "PERLLIB=%s", s);
if (conn->request_info.remote_user != NULL) {
addenv(blk, "REMOTE_USER=%s", conn->request_info.remote_user);
addenv(blk, "%s", "AUTH_TYPE=Digest");
}
/* Add all headers as HTTP_* variables */
for (i = 0; i < conn->request_info.num_headers; i++) {
p = addenv(blk, "HTTP_%s=%s",
conn->request_info.http_headers[i].name,
conn->request_info.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);
}
}
/* Add user-specified variables */
s = conn->ctx->config->cgi_environment;
while ((s = next_option(s, &var_vec, NULL)) != NULL)
addenv(blk, "%.*s", var_vec.len, var_vec.ptr);
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 void
send_cgi(struct mg_connection *conn, const char *prog)
{
int headers_len, data_len, i;
const char *status;
char buf[MAX_REQUEST_SIZE], *pbuf;
struct mg_request_info ri;
struct cgi_env_block blk;
char dir[FILENAME_MAX], *p;
int fd_stdin[2], fd_stdout[2];
FILE *in, *out;
pid_t pid;
prepare_cgi_environment(conn, prog, &blk);
/* CGI must be executed in its own directory */
(void) mg_snprintf(conn, dir, sizeof(dir), "%s", prog);
if ((p = strrchr(dir, DIRSEP)) != NULL)
*p++ = '\0';
pid = (pid_t) -1;
fd_stdin[0] = fd_stdin[1] = fd_stdout[0] = fd_stdout[1] = -1;
in = out = NULL;
if (pipe(fd_stdin) != 0 || pipe(fd_stdout) != 0) {
send_error(conn, 500, http_500_error,
"Cannot create CGI pipe: %s", strerror(ERRNO));
goto done;
} else if ((pid = spawn_process(conn, p, blk.buf, blk.vars,
fd_stdin[0], fd_stdout[1], dir)) == (pid_t) -1) {
goto done;
} else if ((in = fdopen(fd_stdin[1], "wb")) == NULL ||
(out = fdopen(fd_stdout[0], "rb")) == NULL) {
send_error(conn, 500, http_500_error,
"fopen: %s", strerror(ERRNO));
goto done;
}
setbuf(in, NULL);
setbuf(out, NULL);
/*
* spawn_process() must close those!
* If we don't mark them as closed, close() attempt before
* return from this function throws an exception on Windows.
* Windows does not like when closed descriptor is closed again.
*/
fd_stdin[0] = fd_stdout[1] = -1;
/* Send POST data to the CGI process if needed */
if (!strcmp(conn->request_info.request_method, "POST") &&
!handle_request_body(conn, in)) {
goto done;
}
/*
* Now read CGI reply into a buffer. We need to set correct
* status code, thus we need to see all HTTP headers first.
* Do not send anything back to client, until we buffer in all
* HTTP headers.
*/
data_len = 0;
headers_len = read_request(out, INVALID_SOCKET, NULL,
buf, sizeof(buf), &data_len);
if (headers_len <= 0) {
send_error(conn, 500, http_500_error,
"CGI program sent malformed HTTP headers: [%.*s]",
data_len, buf);
goto done;
}
pbuf = buf;
buf[headers_len - 1] = '\0';
parse_http_headers(&pbuf, &ri);
/* Make up and send the status line */
status = get_header(&ri, "Status");
conn->request_info.status_code = status == NULL ? 200 : atoi(status);
(void) mg_printf(conn, "HTTP/1.1 %d OK\r\n",
conn->request_info.status_code);
/* Send headers */
for (i = 0; i < ri.num_headers; i++)
(void) mg_printf(conn, "%s: %s\r\n",
ri.http_headers[i].name,
ri.http_headers[i].value);
(void) mg_write(conn, "\r\n", 2);
/* Send chunk of data that may be read after the headers */
conn->num_bytes_sent += mg_write(conn,
buf + headers_len, data_len - headers_len);
/* Read the rest of CGI output and send to the client */
send_opened_file_stream(conn, out, INT64_MAX);
done:
if (pid != (pid_t) -1)
kill(pid, SIGTERM);
if (fd_stdin[0] != -1)
(void) close(fd_stdin[0]);
if (fd_stdout[1] != -1)
(void) close(fd_stdout[1]);
if (in != NULL)
(void) fclose(in);
else if (fd_stdin[1] != -1)
(void) close(fd_stdin[1]);
if (out != NULL)
(void) fclose(out);
else if (fd_stdout[0] != -1)
(void) close(fd_stdout[0]);
}
#endif /* !NO_CGI */
/*
* 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[FILENAME_MAX];
const char *s, *p;
struct mgstat st;
size_t len;
for (s = p = path + 2; (p = strchr(s, '/')) != NULL; s = ++p) {
len = p - path;
assert(len < sizeof(buf));
(void) memcpy(buf, path, len);
buf[len] = '\0';
/* Try to create intermediate directory */
if (mg_stat(buf, &st) == -1 && mg_mkdir(buf, 0755) != 0)
return (-1);
/* Is path itself a directory ? */
if (p[1] == '\0')
return (0);
}
return (1);
}
static void
put_file(struct mg_connection *conn, const char *path)
{
struct mgstat st;
const char *range;
int64_t r1, r2;
FILE *fp;
int rc;
conn->request_info.status_code = mg_stat(path, &st) == 0 ? 200 : 201;
if ((rc = put_dir(path)) == 0) {
(void) mg_printf(conn, "HTTP/1.1 %d OK\r\n\r\n",
conn->request_info.status_code);
} else if (rc == -1) {
send_error(conn, 500, http_500_error,
"put_dir(%s): %s", path, strerror(ERRNO));
} else if ((fp = mg_fopen(path, "wb+")) == NULL) {
send_error(conn, 500, http_500_error,
"fopen(%s): %s", path, strerror(ERRNO));
} else {
set_close_on_exec(fileno(fp));
range = mg_get_header(conn, "Content-Range");
r1 = r2 = 0;
if (range != NULL && parse_range_header(range, &r1, &r2) > 0) {
conn->request_info.status_code = 206;
/* TODO(lsm): handle seek error */
(void) fseeko(fp, (off_t) r1, SEEK_SET);
}
if (handle_request_body(conn, fp))
(void) mg_printf(conn, "HTTP/1.1 %d OK\r\n\r\n",
conn->request_info.status_code);
(void) fclose(fp);
}
}
#if !defined(NO_SSI)
static void send_ssi_file(struct mg_connection *, const char *, FILE *, int);
static void
do_ssi_include(struct mg_connection *conn, const char *ssi, char *tag,
int include_level)
{
char file_name[BUFSIZ], path[FILENAME_MAX], *p;
struct vec root;
bool_t is_ssi;
FILE *fp;
get_document_root(conn, &root);
/*
* sscanf() is safe here, since send_ssi_file() also uses buffer
* of size BUFSIZ to get the tag. So strlen(tag) is always < BUFSIZ.
*/
if (sscanf(tag, " virtual=\"%[^\"]\"", file_name) == 1) {
/* File name is relative to the webserver root */
(void) mg_snprintf(conn, path, sizeof(path), "%.*s%c%s",
root.len, root.ptr, DIRSEP, file_name);
} else if (sscanf(tag, " file=\"%[^\"]\"", file_name) == 1) {
/*
* File name is relative to the webserver working directory
* or it is absolute system path
*/
(void) mg_snprintf(conn, path, sizeof(path), "%s", file_name);
} else if (sscanf(tag, " \"%[^\"]\"", file_name) == 1) {
/* File name is relative to the currect document */
(void) mg_snprintf(conn, path, sizeof(path), "%s", ssi);
if ((p = strrchr(path, DIRSEP)) != NULL)
p[1] = '\0';
(void) mg_snprintf(conn, path + strlen(path),
sizeof(path) - strlen(path), "%s", file_name);
} else {
cry(conn, "Bad SSI #include: [%s]", tag);
return;
}
if ((fp = mg_fopen(path, "rb")) == NULL) {
cry(conn, "Cannot open SSI #include: [%s]: fopen(%s): %s",
tag, path, strerror(ERRNO));
} else {
set_close_on_exec(fileno(fp));
is_ssi = match_extension(path,
conn->ctx->config->ssi_extensions);
if (is_ssi) {
send_ssi_file(conn, path, fp, include_level + 1);
} else {
send_opened_file_stream(conn, fp, INT64_MAX);
}
(void) fclose(fp);
}
}
static void
do_ssi_exec(struct mg_connection *conn, char *tag)
{
char cmd[BUFSIZ];
FILE *fp;
if (sscanf(tag, " \"%[^\"]\"", cmd) != 1) {
cry(conn, "Bad SSI #exec: [%s]", tag);
} else if ((fp = popen(cmd, "r")) == NULL) {
cry(conn, "Cannot SSI #exec: [%s]: %s", cmd, strerror(ERRNO));
} else {
send_opened_file_stream(conn, fp, INT64_MAX);
(void) pclose(fp);
}
}
static void
send_ssi_file(struct mg_connection *conn, const char *path, FILE *fp,
int include_level)
{
char buf[BUFSIZ];
int ch, len, in_ssi_tag;
if (include_level > 10) {
cry(conn, "SSI #include level is too deep (%s)", path);
return;
}
in_ssi_tag = FALSE;
len = 0;
while ((ch = fgetc(fp)) != EOF) {
if (in_ssi_tag && ch == '>') {
in_ssi_tag = FALSE;
buf[len++] = (char) ch;
buf[len] = '\0';
assert(len <= (int) sizeof(buf));
if (len < 6 || memcmp(buf, "<!--#", 5) != 0) {
/* Not an SSI tag, pass it */
(void) mg_write(conn, buf, len);
} else {
if (!memcmp(buf + 5, "include", 7)) {
do_ssi_include(conn, path, buf + 12,
include_level);
} else if (!memcmp(buf + 5, "exec", 4)) {
do_ssi_exec(conn, buf + 9);
} else {
cry(conn, "%s: unknown SSI "
"command: \"%s\"", path, buf);
}
}
len = 0;
} else if (in_ssi_tag) {
if (len == 5 && memcmp(buf, "<!--#", 5) != 0) {
/* Not an SSI tag */
in_ssi_tag = FALSE;
} else if (len == (int) sizeof(buf) - 2) {
cry(conn, "%s: SSI tag is too large", path);
len = 0;
}
buf[len++] = ch & 0xff;
} else if (ch == '<') {
in_ssi_tag = TRUE;
if (len > 0)
(void) mg_write(conn, buf, len);
len = 0;
buf[len++] = ch & 0xff;
} else {
buf[len++] = ch & 0xff;
if (len == (int) sizeof(buf)) {
(void) mg_write(conn, buf, len);
len = 0;
}
}
}
/* Send the rest of buffered data */
if (len > 0)
(void) mg_write(conn, buf, len);
}
static void
send_ssi(struct mg_connection *conn, const char *path)
{
FILE *fp;
if ((fp = mg_fopen(path, "rb")) == NULL) {
send_error(conn, 500, http_500_error,
"fopen(%s): %s", path, strerror(ERRNO));
} else {
set_close_on_exec(fileno(fp));
(void) mg_printf(conn, "%s", "HTTP/1.1 200 OK\r\n"
"Content-Type: text/html\r\nConnection: close\r\n\r\n");
send_ssi_file(conn, path, fp, 0);
(void) fclose(fp);
}
}
#endif /* !NO_SSI */
/*
* This is the heart of the Mongoose's logic.
* This function is called when the request is read, parsed and validated,
* and Mongoose must decide what action to take: serve a file, or
* a directory, or call embedded function, etcetera.
*/
static void
handle_request(struct mg_connection *conn)
{
struct mg_request_info *ri;
char path[FILENAME_MAX];
int uri_len;
struct mgstat st;
mg_callback_t new_request_callback;
ri = &conn->request_info;
if ((conn->request_info.query_string = strchr(ri->uri, '?')) != NULL)
* conn->request_info.query_string++ = '\0';
uri_len = strlen(ri->uri);
new_request_callback = conn->ctx->config->new_request_handler;
(void) url_decode(ri->uri, uri_len, ri->uri, uri_len + 1, FALSE);
remove_double_dots_and_double_slashes(ri->uri);
convert_uri_to_file_name(conn, ri->uri, path, sizeof(path));
if (new_request_callback && new_request_callback(conn, ri) == TRUE) {
/* Do nothing, callback has served the request */
} else if (!check_authorization(conn, path)) {
send_authorization_request(conn);
} else if (strstr(path, PASSWORDS_FILE_NAME)) {
/* Do not allow to view passwords files */
send_error(conn, 403, "Forbidden", "Access Forbidden");
} else if (conn->ctx->config->document_root == NULL) {
send_error(conn, 404, "Not Found", "Not Found");
} else if ((!strcmp(ri->request_method, "PUT") ||
!strcmp(ri->request_method, "DELETE")) &&
(conn->ctx->config->put_delete_passwords_file == NULL ||
!is_authorized_for_put(conn))) {
send_authorization_request(conn);
} else if (!strcmp(ri->request_method, "PUT")) {
put_file(conn, path);
} else if (!strcmp(ri->request_method, "DELETE")) {
if (mg_remove(path) == 0)
send_error(conn, 200, "OK", "");
else
send_error(conn, 500, http_500_error,
"remove(%s): %s", path, strerror(ERRNO));
} else if (mg_stat(path, &st) != 0) {
send_error(conn, 404, "Not Found", "%s", "File not found");
} else if (st.is_directory && ri->uri[uri_len - 1] != '/') {
(void) mg_printf(conn,
"HTTP/1.1 301 Moved Permanently\r\n"
"Location: %s/\r\n\r\n", ri->uri);
} else if (st.is_directory &&
substitute_index_file(conn, path, sizeof(path), &st) == FALSE) {
if (conn->ctx->config->enable_directory_listing) {
send_directory(conn, path);
} else {
send_error(conn, 403, "Directory Listing Denied",
"Directory listing denied");
}
#if !defined(NO_CGI)
} else if (match_extension(path, conn->ctx->config->cgi_extensions)) {
if (strcmp(ri->request_method, "POST") &&
strcmp(ri->request_method, "GET")) {
send_error(conn, 501, "Not Implemented",
"Method %s is not implemented", ri->request_method);
} else {
send_cgi(conn, path);
}
#endif /* NO_CGI */
#if !defined(NO_SSI)
} else if (match_extension(path, conn->ctx->config->ssi_extensions)) {
send_ssi(conn, path);
#endif /* NO_SSI */
} else if (is_not_modified(conn, &st)) {
send_error(conn, 304, "Not Modified", "");
} else {
send_file(conn, path, &st);
}
}
static void
close_all_listening_sockets(struct mg_context *ctx)
{
struct socket *sp, *tmp;
for (sp = ctx->listening_sockets; sp != NULL; sp = tmp) {
tmp = sp->next;
(void) closesocket(sp->sock);
free(sp);
}
ctx->listening_sockets = NULL;
}
static enum mg_error_t
set_ports_option(struct mg_context *ctx)
{
SOCKET sock;
int is_ssl;
struct vec vec;
struct socket *listener;
const char *list = ctx->config->listening_ports;
close_all_listening_sockets(ctx);
while ((list = next_option(list, &vec, NULL)) != NULL) {
is_ssl = vec.ptr[vec.len - 1] == 's' ? TRUE : FALSE;
if ((listener = calloc(1, sizeof(*listener))) == NULL) {
cry(fc(ctx), "%s", "Too many listeninig sockets");
return (MG_ERROR);
} else if ((sock = mg_open_listening_port(ctx,
vec.ptr, &listener->lsa)) == INVALID_SOCKET) {
cry(fc(ctx), "cannot bind to %.*s", vec.len, vec.ptr);
return (MG_ERROR);
} else if (is_ssl == TRUE && ctx->ssl_ctx == NULL) {
(void) closesocket(sock);
cry(fc(ctx), "cannot add SSL socket, please specify "
"-ssl_cert option BEFORE -ports option");
return (MG_ERROR);
} else {
listener->sock = sock;
listener->is_ssl = is_ssl;
listener->next = ctx->listening_sockets;
ctx->listening_sockets = listener;
}
}
return (MG_SUCCESS);
}
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 mg_connection *conn)
{
const struct mg_request_info *ri;
FILE *fp;
char date[64];
fp = conn->ctx->config->access_log_file == NULL ? NULL :
mg_fopen(conn->ctx->config->access_log_file, "a+");
if (fp == NULL)
return;
(void) strftime(date, sizeof(date), "%d/%b/%Y:%H:%M:%S %z",
localtime(&conn->birth_time));
ri = &conn->request_info;
flockfile(fp);
(void) fprintf(fp,
"%s - %s [%s] \"%s %s HTTP/%s\" %d %" INT64_FMT,
inet_ntoa(conn->client.rsa.u.sin.sin_addr),
ri->remote_user == NULL ? "-" : ri->remote_user,
date,
ri->request_method ? ri->request_method : "-",
ri->uri ? ri->uri : "-",
ri->http_version,
conn->request_info.status_code, conn->num_bytes_sent);
log_header(conn, "Referer", fp);
log_header(conn, "User-Agent", fp);
(void) fputc('\n', fp);
(void) fflush(fp);
funlockfile(fp);
(void) fclose(fp);
}
static bool_t
isbyte(int n) {
return (n >= 0 && n <= 255);
}
/*
* Verify given socket address against the ACL.
* Return -1 if ACL is malformed, 0 if address is disallowed, 1 if allowed.
*/
static enum mg_error_t
check_acl(struct mg_context *ctx, const struct usa *usa)
{
int a, b, c, d, n, mask, allowed;
char flag;
uint32_t acl_subnet, acl_mask, remote_ip;
struct vec vec;
const char *list = ctx->config->acl;
if (list == NULL)
return (MG_SUCCESS);
(void) memcpy(&remote_ip, &usa->u.sin.sin_addr, sizeof(remote_ip));
/* If any ACL is set, deny by default */
allowed = '-';
while ((list = next_option(list, &vec, NULL)) != NULL) {
mask = 32;
if (sscanf(vec.ptr, "%c%d.%d.%d.%d%n",
&flag, &a, &b, &c, &d, &n) != 5) {
cry(fc(ctx),
"%s: subnet must be [+|-]x.x.x.x[/x]", __func__);
return (MG_ERROR);
} else if (flag != '+' && flag != '-') {
cry(fc(ctx), "%s: flag must be + or -: [%s]",
__func__, vec.ptr);
return (MG_ERROR);
} else if (!isbyte(a)||!isbyte(b)||!isbyte(c)||!isbyte(d)) {
cry(fc(ctx),
"%s: bad ip address: [%s]", __func__, vec.ptr);
return (MG_ERROR);
} else if (sscanf(vec.ptr + n, "/%d", &mask) == 0) {
/* Do nothing, no mask specified */
} else if (mask < 0 || mask > 32) {
cry(fc(ctx), "%s: bad subnet mask: %d [%s]",
__func__, n, vec.ptr);
return (MG_ERROR);
}
acl_subnet = (a << 24) | (b << 16) | (c << 8) | d;
acl_mask = mask ? 0xffffffffU << (32 - mask) : 0;
if (acl_subnet == (ntohl(remote_ip) & acl_mask))
allowed = flag;
}
return (allowed == '+' ? MG_SUCCESS : MG_ERROR);
}
static void
add_to_set(SOCKET fd, fd_set *set, int *max_fd)
{
FD_SET(fd, set);
if (fd > (SOCKET) *max_fd)
*max_fd = (int) fd;
}
#if !defined(_WIN32)
static enum mg_error_t
set_uid_option(struct mg_context *ctx)
{
struct passwd *pw;
const char *uid = ctx->config->uid;
enum mg_error_t error;
if (uid == NULL) {
error = MG_SUCCESS;
} else {
if ((pw = getpwnam(uid)) == NULL)
cry(fc(ctx), "%s: unknown user [%s]", __func__, uid);
else if (setgid(pw->pw_gid) == -1)
cry(fc(ctx), "%s: setgid(%s): %s",
__func__, uid, strerror(errno));
else if (setuid(pw->pw_uid) == -1)
cry(fc(ctx), "%s: setuid(%s): %s",
__func__, uid, strerror(errno));
else
error = MG_SUCCESS;
}
return (error);
}
#endif /* !_WIN32 */
#if !defined(NO_SSL)
static pthread_mutex_t *ssl_mutexes;
static void
ssl_locking_callback(int mode, int mutex_num, const char *file, int line)
{
line = 0; /* Unused */
file = NULL; /* Unused */
if (mode & CRYPTO_LOCK)
(void) pthread_mutex_lock(&ssl_mutexes[mutex_num]);
else
(void) pthread_mutex_unlock(&ssl_mutexes[mutex_num]);
}
static unsigned long
ssl_id_callback(void)
{
return ((unsigned long) pthread_self());
}
static bool_t
load_dll(struct mg_context *ctx, const char *dll_name, struct ssl_func *sw)
{
union {void *p; void (*fp)(void);} u;
void *dll_handle;
struct ssl_func *fp;
if ((dll_handle = dlopen(dll_name, RTLD_LAZY)) == NULL) {
cry(fc(ctx), "%s: cannot load %s", __func__, dll_name);
return (FALSE);
}
for (fp = sw; fp->name != NULL; fp++) {
#ifdef _WIN32
/* GetProcAddress() returns pointer to function */
u.fp = (void (*)(void)) dlsym(dll_handle, fp->name);
#else
/*
* dlsym() on UNIX returns void *.
* ISO C forbids casts of data pointers to function
* pointers. We need to use a union to make a cast.
*/
u.p = dlsym(dll_handle, fp->name);
#endif /* _WIN32 */
if (u.fp == NULL) {
cry(fc(ctx), "%s: cannot find %s", __func__, fp->name);
return (FALSE);
} else {
fp->ptr = u.fp;
}
}
return (TRUE);
}
/*
* Dynamically load SSL library. Set up ctx->ssl_ctx pointer.
*/
static enum mg_error_t
set_ssl_option(struct mg_context *ctx)
{
SSL_CTX *CTX;
int i, size;
const char *pem = ctx->config->ssl_certificate;
if (pem == NULL)
return (MG_SUCCESS);
if (load_dll(ctx, SSL_LIB, ssl_sw) == FALSE ||
load_dll(ctx, CRYPTO_LIB, crypto_sw) == FALSE)
return (MG_ERROR);
/* Initialize SSL crap */
SSL_library_init();
SSL_load_error_strings();
if ((CTX = SSL_CTX_new(SSLv23_server_method())) == NULL)
ssl_cry(fc(ctx), "SSL_CTX_new error");
else if (ctx->config->ssl_password_handler != NULL)
SSL_CTX_set_default_passwd_cb(CTX,
ctx->config->ssl_password_handler);
if (CTX != NULL && SSL_CTX_use_certificate_file(
CTX, pem, SSL_FILETYPE_PEM) == 0) {
ssl_cry(fc(ctx), "%s: cannot open %s", __func__, pem);
return (MG_ERROR);
} else if (CTX != NULL && SSL_CTX_use_PrivateKey_file(
CTX, pem, SSL_FILETYPE_PEM) == 0) {
ssl_cry(fc(ctx), "%s: cannot open %s", NULL, pem);
return (MG_ERROR);
}
/*
* Initialize locking callbacks, needed for thread safety.
* http://www.openssl.org/support/faq.html#PROG1
*/
size = sizeof(pthread_mutex_t) * CRYPTO_num_locks();
if ((ssl_mutexes = (pthread_mutex_t *) malloc(size)) == NULL) {
ssl_cry(fc(ctx), "%s: cannot allocate mutexes", __func__);
return (MG_ERROR);
}
for (i = 0; i < CRYPTO_num_locks(); i++)
pthread_mutex_init(&ssl_mutexes[i], NULL);
CRYPTO_set_locking_callback(&ssl_locking_callback);
CRYPTO_set_id_callback(&ssl_id_callback);
/* Done with everything. Save the context. */
ctx->ssl_ctx = CTX;
return (MG_SUCCESS);
}
#endif /* !NO_SSL */
static enum mg_error_t
set_gpass_option(struct mg_context *ctx)
{
struct mgstat mgstat;
const char *path = ctx->config->global_passwords_file;
return (path == NULL || mg_stat(path, &mgstat) == 0 ?
MG_SUCCESS : MG_ERROR);
}
static enum mg_error_t
set_acl_option(struct mg_context *ctx)
{
struct usa fake;
return (check_acl(ctx, &fake));
}
static bool_t
verify_document_root(struct mg_context *ctx, const char *root)
{
char path[FILENAME_MAX], *p;
struct mgstat buf;
if ((p = strchr(root, ',')) == NULL) {
mg_strlcpy(path, root, sizeof(path));
} else {
mg_strlcpy(path, root, p - root + 1);
}
if (mg_stat(path, &buf) != 0) {
cry(fc(ctx), "Invalid root directory: \"%s\"", root);
return (FALSE);
}
return (TRUE);
}
static void
reset_per_request_attributes(struct mg_connection *conn)
{
if (conn->request_info.remote_user != NULL) {
free((void *) conn->request_info.remote_user);
conn->request_info.remote_user = NULL;
}
if (conn->free_post_data && conn->request_info.post_data != NULL) {
free((void *) conn->request_info.post_data);
conn->request_info.post_data = NULL;
}
}
static void
close_socket_gracefully(struct mg_connection *conn, SOCKET sock)
{
char buf[BUFSIZ];
int n;
/* Send FIN to the client */
(void) shutdown(sock, SHUT_WR);
set_non_blocking_mode(conn, sock);
/*
* Read and discard pending data. If we do not do that and close the
* socket, the data in the send buffer may be discarded. This
* behaviour is seen on Windows, when client keeps sending data
* when server decide to close the connection; then when client
* does recv() it gets no data back.
*/
do {
n = pull(NULL, sock, NULL, buf, sizeof(buf));
} while (n > 0);
/* Now we know that our FIN is ACK-ed, safe to close */
(void) closesocket(sock);
}
static void
close_connection(struct mg_connection *conn)
{
reset_per_request_attributes(conn);
if (conn->ssl) {
SSL_free(conn->ssl);
conn->ssl = NULL;
}
if (conn->client.sock != INVALID_SOCKET)
close_socket_gracefully(conn, conn->client.sock);
}
static void
reset_connection_attributes(struct mg_connection *conn)
{
reset_per_request_attributes(conn);
conn->free_post_data = FALSE;
conn->request_info.status_code = -1;
conn->num_bytes_sent = 0;
(void) memset(&conn->request_info, 0, sizeof(conn->request_info));
}
static void
shift_to_next(struct mg_connection *conn, char *buf, int req_len, int *nread)
{
int64_t cl;
int over_len, body_len;
cl = get_content_length(conn);
over_len = *nread - req_len;
assert(over_len >= 0);
if (cl == -1) {
body_len = 0;
} else if (cl < (int64_t) over_len) {
body_len = (int) cl;
} else {
body_len = over_len;
}
*nread -= req_len + body_len;
(void) memmove(buf, buf + req_len + body_len, *nread);
}
static void
process_new_connection(struct mg_connection *conn)
{
struct mg_request_info *ri = &conn->request_info;
char buf[MAX_REQUEST_SIZE];
int request_len, nread;
nread = 0;
reset_connection_attributes(conn);
/* If next request is not pipelined, read it in */
if ((request_len = get_request_len(buf, (size_t) nread)) == 0)
request_len = read_request(NULL, conn->client.sock,
conn->ssl, buf, sizeof(buf), &nread);
assert(nread >= request_len);
if (request_len <= 0)
return; /* Remote end closed the connection */
/* 0-terminate the request: parse_request uses sscanf */
buf[request_len - 1] = '\0';
if (parse_http_request(buf, ri)) {
if (strcmp(ri->http_version, "1.0") != 0 &&
strcmp(ri->http_version, "1.1") != 0) {
send_error(conn, 505,
"HTTP version not supported",
"%s", "Weird HTTP version");
log_access(conn);
} else {
ri->post_data = buf + request_len;
ri->post_data_len = nread - request_len;
conn->birth_time = time(NULL);
handle_request(conn);
log_access(conn);
shift_to_next(conn, buf, request_len, &nread);
}
} else {
/* Do not put garbage in the access log */
send_error(conn, 400, "Bad Request",
"Can not parse request: [%.*s]", nread, buf);
}
}
/*
* Worker threads take accepted socket from the queue
*/
static bool_t
get_socket(struct mg_context *ctx, struct socket *sp)
{
struct timespec ts;
(void) pthread_mutex_lock(&ctx->mutex);
DEBUG_TRACE((DEBUG_MGS_PREFIX "%s: thread %p: going idle",
__func__, (void *) pthread_self()));
/* If the queue is empty, wait. We're idle at this point. */
ctx->num_idle++;
while (ctx->sq_head == ctx->sq_tail) {
ts.tv_nsec = 0;
ts.tv_sec = time(NULL) + 10;
if (pthread_cond_timedwait(&ctx->empty_cond,
&ctx->mutex, &ts) != 0) {
/* Timeout! release the mutex and return */
(void) pthread_mutex_unlock(&ctx->mutex);
return (FALSE);
}
}
assert(ctx->sq_head > ctx->sq_tail);
/* We're going busy now: got a socket to process! */
ctx->num_idle--;
/* Copy socket from the queue and increment tail */
*sp = ctx->queue[ctx->sq_tail % ARRAY_SIZE(ctx->queue)];
ctx->sq_tail++;
DEBUG_TRACE((DEBUG_MGS_PREFIX
"%s: thread %p grabbed socket %d, going busy",
__func__, (void *) pthread_self(), sp->sock));
/* Wrap pointers if needed */
while (ctx->sq_tail > (int) ARRAY_SIZE(ctx->queue)) {
ctx->sq_tail -= ARRAY_SIZE(ctx->queue);
ctx->sq_head -= ARRAY_SIZE(ctx->queue);
}
(void) pthread_cond_signal(&ctx->full_cond);
(void) pthread_mutex_unlock(&ctx->mutex);
return (TRUE);
}
static void
worker_thread(struct mg_context *ctx)
{
struct mg_connection conn;
DEBUG_TRACE((DEBUG_MGS_PREFIX "%s: thread %p starting",
__func__, (void *) pthread_self()));
(void) memset(&conn, 0, sizeof(conn));
while (get_socket(ctx, &conn.client) == TRUE) {
conn.birth_time = time(NULL);
conn.ctx = ctx;
/*
* Fill in IP, port info early so even if SSL setup below fails,
* error handler would have the corresponding info.
* Thanks to Johannes Winkelmann for the patch.
*/
conn.request_info.remote_port =
ntohs(conn.client.rsa.u.sin.sin_port);
(void) memcpy(&conn.request_info.remote_ip,
&conn.client.rsa.u.sin.sin_addr.s_addr, 4);
conn.request_info.remote_ip =
ntohl(conn.request_info.remote_ip);
conn.request_info.is_ssl = conn.client.is_ssl;
if (conn.client.is_ssl &&
(conn.ssl = SSL_new(conn.ctx->ssl_ctx)) == NULL) {
ssl_cry(&conn, "%s: SSL_new: %d", __func__, ERRNO);
} else if (conn.client.is_ssl &&
SSL_set_fd(conn.ssl, conn.client.sock) != 1) {
ssl_cry(&conn, "%s: SSL_set_fd: %d", __func__, ERRNO);
} else if (conn.client.is_ssl && SSL_accept(conn.ssl) != 1) {
ssl_cry(&conn, "%s: SSL handshake error", __func__);
} else {
process_new_connection(&conn);
}
close_connection(&conn);
}
/* Signal master that we're done with connection and exiting */
(void) pthread_mutex_lock(&ctx->mutex);
ctx->num_threads--;
ctx->num_idle--;
(void) pthread_cond_signal(&ctx->thr_cond);
assert(ctx->num_threads >= 0);
(void) pthread_mutex_unlock(&ctx->mutex);
DEBUG_TRACE((DEBUG_MGS_PREFIX "%s: thread %p exiting",
__func__, (void *) pthread_self()));
}
/*
* Master thread adds accepted socket to a queue
*/
static void
put_socket(struct mg_context *ctx, const struct socket *sp)
{
(void) pthread_mutex_lock(&ctx->mutex);
/* If the queue is full, wait */
while (ctx->sq_head - ctx->sq_tail >= (int) ARRAY_SIZE(ctx->queue))
(void) pthread_cond_wait(&ctx->full_cond, &ctx->mutex);
assert(ctx->sq_head - ctx->sq_tail < (int) ARRAY_SIZE(ctx->queue));
/* Copy socket to the queue and increment head */
ctx->queue[ctx->sq_head % ARRAY_SIZE(ctx->queue)] = *sp;
ctx->sq_head++;
DEBUG_TRACE((DEBUG_MGS_PREFIX "%s: queued socket %d",
__func__, sp->sock));
/* If there are no idle threads, start one */
if (ctx->num_idle == 0 &&
ctx->num_threads < atoi(ctx->config->num_threads)) {
if (start_thread(ctx,
(mg_thread_func_t) worker_thread, ctx) != 0)
cry(fc(ctx), "Cannot start thread: %d", ERRNO);
else
ctx->num_threads++;
}
(void) pthread_cond_signal(&ctx->empty_cond);
(void) pthread_mutex_unlock(&ctx->mutex);
}
static void
accept_new_connection(const struct socket *listener, struct mg_context *ctx)
{
struct socket accepted;
bool_t allowed;
accepted.rsa.len = sizeof(accepted.rsa.u.sin);
accepted.lsa = listener->lsa;
if ((accepted.sock = accept(listener->sock,
&accepted.rsa.u.sa, &accepted.rsa.len)) == INVALID_SOCKET)
return;
allowed = check_acl(ctx, &accepted.rsa) == MG_SUCCESS;
if (allowed) {
/* Put accepted socket structure into the queue */
DEBUG_TRACE((DEBUG_MGS_PREFIX "%s: accepted socket %d",
__func__, accepted.sock));
accepted.is_ssl = listener->is_ssl;
put_socket(ctx, &accepted);
} else {
cry(fc(ctx), "%s: %s is not allowed to connect",
__func__, inet_ntoa(accepted.rsa.u.sin.sin_addr));
(void) closesocket(accepted.sock);
}
}
static void
master_thread(struct mg_context *ctx)
{
fd_set read_set;
struct timeval tv;
struct socket *sp;
int max_fd;
while (ctx->stop_flag == 0) {
FD_ZERO(&read_set);
max_fd = -1;
/* Add listening sockets to the read set */
for (sp = ctx->listening_sockets; sp != NULL; sp = sp->next)
add_to_set(sp->sock, &read_set, &max_fd);
tv.tv_sec = 1;
tv.tv_usec = 0;
if (select(max_fd + 1, &read_set, NULL, NULL, &tv) < 0) {
#ifdef _WIN32
/*
* On windows, if read_set and write_set are empty,
* select() returns "Invalid parameter" error
* (at least on my Windows XP Pro). So in this case,
* we sleep here.
*/
sleep(1);
#endif /* _WIN32 */
} else {
for (sp = ctx->listening_sockets;
sp != NULL; sp = sp->next)
if (FD_ISSET(sp->sock, &read_set))
accept_new_connection(sp, ctx);
}
}
/* Stop signal received: somebody called mg_stop. Quit. */
close_all_listening_sockets(ctx);
/* Wait until all threads finish */
(void) pthread_mutex_lock(&ctx->mutex);
while (ctx->num_threads > 0)
(void) pthread_cond_wait(&ctx->thr_cond, &ctx->mutex);
(void) pthread_mutex_unlock(&ctx->mutex);
/* Deallocate SSL context */
if (ctx->ssl_ctx != NULL)
SSL_CTX_free(ctx->ssl_ctx);
(void) pthread_mutex_destroy(&ctx->mutex);
(void) pthread_cond_destroy(&ctx->thr_cond);
(void) pthread_cond_destroy(&ctx->empty_cond);
(void) pthread_cond_destroy(&ctx->full_cond);
/* Signal mg_stop() that we're done */
ctx->stop_flag = 2;
}
void
mg_stop(struct mg_context *ctx)
{
ctx->stop_flag = 1;
/* Wait until mg_fini() stops */
while (ctx->stop_flag != 2)
(void) sleep(1);
assert(ctx->num_threads == 0);
free(ctx);
#if defined(_WIN32)
(void) WSACleanup();
#endif /* _WIN32 */
}
struct mg_context *
mg_start(struct mg_config *config)
{
struct mg_context *ctx, fake_ctx;
#if defined(_WIN32)
WSADATA data;
WSAStartup(MAKEWORD(2,2), &data);
#endif /* _WIN32 */
fake_ctx.config = config;
if (config->listening_ports == NULL ||
config->num_threads == NULL ||
config->auth_domain == NULL) {
cry(fc(&fake_ctx), "Please specify "
"num_threads, listening_ports, auth_domain");
return (NULL);
} else if (config->document_root != NULL &&
verify_document_root(&fake_ctx, config->document_root) != TRUE) {
cry(fc(&fake_ctx), "Invalid root directory: \"%s\"",
config->document_root);
return (NULL);
} else if ((ctx = calloc(1, sizeof(*ctx))) == NULL) {
cry(fc(&fake_ctx), "Cannot allocate mongoose context");
return (NULL);
}
ctx->config = config;
/*
* NOTE(lsm): order is important here. SSL certificates must
* be initialized before listening ports.
*/
if (set_ssl_option(ctx) == MG_ERROR ||
set_ports_option(ctx) == MG_ERROR ||
set_gpass_option(ctx) == MG_ERROR ||
#if !defined(_WIN32)
set_uid_option(ctx) == MG_ERROR ||
#endif
set_acl_option(ctx) == MG_ERROR) {
free(ctx);
return (NULL);
}
#if !defined(_WIN32)
/*
* Ignore SIGPIPE signal, so if browser cancels the request, it
* won't kill the whole process.
*/
(void) signal(SIGPIPE, SIG_IGN);
#endif /* !_WIN32 */
(void) pthread_mutex_init(&ctx->mutex, NULL);
(void) pthread_cond_init(&ctx->thr_cond, NULL);
(void) pthread_cond_init(&ctx->empty_cond, NULL);
(void) pthread_cond_init(&ctx->full_cond, NULL);
/* Start master (listening) thread */
start_thread(ctx, (mg_thread_func_t) master_thread, ctx);
return (ctx);
}
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