// Copyright (c) 2004-2010 Sergey Lyubka // // 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. #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 #include #include #include #include #endif // !_WIN32_WCE #include #include #include #include #include #include #include #include #include #if defined(_WIN32) // Windows specific #includes and #defines #define _WIN32_WINNT 0x0400 // To make it link in VS2005 #include #ifndef PATH_MAX #define PATH_MAX MAX_PATH #endif #ifndef _WIN32_WCE #include #include #include #else // _WIN32_WCE #include #define NO_CGI // WinCE has no pipes typedef long off_t; #define BUFSIZ 4096 #define errno GetLastError() #define strerror(x) _ultoa(x, (char *) _alloca(sizeof(x) *3 ), 10) #endif // _WIN32_WCE #define MAKEUQUAD(lo, hi) ((uint64_t)(((uint32_t)(lo)) | \ ((uint64_t)((uint32_t)(hi))) << 32)) #define RATE_DIFF 10000000 // 100 nsecs #define EPOCH_DIFF MAKEUQUAD(0xd53e8000, 0x019db1de) #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 WINCDECL __cdecl #define SHUT_WR 1 #define snprintf _snprintf #define vsnprintf _vsnprintf #define sleep(x) Sleep((x) * 1000) #define pipe(x) _pipe(x, BUFSIZ, _O_BINARY) #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 struct {HANDLE signal, broadcast;} 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 #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[PATH_MAX]; }; typedef struct DIR { HANDLE handle; WIN32_FIND_DATAW info; struct dirent result; } DIR; #else // UNIX specific #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #if defined(__MACH__) #define SSL_LIB "libssl.dylib" #define CRYPTO_LIB "libcrypto.dylib" #else #define SSL_LIB "libssl.so" #define CRYPTO_LIB "libcrypto.so" #endif #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; #define WINCDECL #endif // End of Windows and UNIX specific includes #include "mongoose.h" #define MONGOOSE_VERSION "2.12" #define PASSWORDS_FILE_NAME ".htpasswd" #define CGI_ENVIRONMENT_SIZE 4096 #define MAX_CGI_ENVIR_VARS 64 #define ARRAY_SIZE(array) (sizeof(array) / sizeof(array[0])) #if defined(DEBUG) #define DEBUG_TRACE(x) do { \ flockfile(stdout); \ printf("*** %lu.%p.%s.%d: ", \ (unsigned long) time(NULL), (void *) pthread_self(), \ __func__, __LINE__); \ printf x; \ putchar('\n'); \ fflush(stdout); \ funlockfile(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 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 #if defined(NO_SSL_DL) extern void SSL_free(SSL *); extern int SSL_accept(SSL *); extern int SSL_connect(SSL *); extern int SSL_read(SSL *, void *, int); extern int SSL_write(SSL *, const void *, int); extern int SSL_get_error(const SSL *, int); extern int SSL_set_fd(SSL *, int); extern SSL *SSL_new(SSL_CTX *); extern SSL_CTX *SSL_CTX_new(SSL_METHOD *); extern SSL_METHOD *SSLv23_server_method(void); extern int SSL_library_init(void); extern void SSL_load_error_strings(void); extern int SSL_CTX_use_PrivateKey_file(SSL_CTX *, const char *, int); extern int SSL_CTX_use_certificate_file(SSL_CTX *, const char *, int); extern int SSL_CTX_use_certificate_chain_file(SSL_CTX *, const char *); extern void SSL_CTX_set_default_passwd_cb(SSL_CTX *, mg_callback_t); extern void SSL_CTX_free(SSL_CTX *); extern unsigned long ERR_get_error(void); extern char *ERR_error_string(unsigned long, char *); extern int CRYPTO_num_locks(void); extern void CRYPTO_set_locking_callback(void (*)(int, int, const char *, int)); extern void CRYPTO_set_id_callback(unsigned long (*)(void)); #else // Dynamically loaded SSL functionality struct ssl_func { const char *name; // SSL function name void (*ptr)(void); // Function pointer }; #define SSL_free (* (void (*)(SSL *)) ssl_sw[0].ptr) #define SSL_accept (* (int (*)(SSL *)) ssl_sw[1].ptr) #define SSL_connect (* (int (*)(SSL *)) ssl_sw[2].ptr) #define SSL_read (* (int (*)(SSL *, void *, int)) ssl_sw[3].ptr) #define SSL_write (* (int (*)(SSL *, const void *,int)) ssl_sw[4].ptr) #define SSL_get_error (* (int (*)(SSL *, int)) ssl_sw[5]) #define SSL_set_fd (* (int (*)(SSL *, SOCKET)) ssl_sw[6].ptr) #define SSL_new (* (SSL * (*)(SSL_CTX *)) ssl_sw[7].ptr) #define SSL_CTX_new (* (SSL_CTX * (*)(SSL_METHOD *)) ssl_sw[8].ptr) #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 (* (int (*)(SSL_CTX *, \ const char *, int)) ssl_sw[11].ptr) #define SSL_CTX_use_certificate_file (* (int (*)(SSL_CTX *, \ const char *, int)) ssl_sw[12].ptr) #define SSL_CTX_set_default_passwd_cb \ (* (void (*)(SSL_CTX *, mg_callback_t)) ssl_sw[13].ptr) #define SSL_CTX_free (* (void (*)(SSL_CTX *)) ssl_sw[14].ptr) #define SSL_load_error_strings (* (void (*)(void)) ssl_sw[15].ptr) #define SSL_CTX_use_certificate_chain_file \ (* (int (*)(SSL_CTX *, const char *)) ssl_sw[16].ptr) #define CRYPTO_num_locks (* (int (*)(void)) crypto_sw[0].ptr) #define CRYPTO_set_locking_callback \ (* (void (*)(void (*)(int, int, const char *, int))) crypto_sw[1].ptr) #define CRYPTO_set_id_callback \ (* (void (*)(unsigned long (*)(void))) crypto_sw[2].ptr) #define ERR_get_error (* (unsigned long (*)(void)) ssl_sw[3].ptr) #define ERR_error_string (* (char * (*)(unsigned long, char *)) ssl_sw[4].ptr) // 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}, {"SSL_load_error_strings", NULL}, {"SSL_CTX_use_certificate_chain_file", 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}, {"ERR_get_error", NULL}, {"ERR_error_string", NULL}, {NULL, NULL} }; #endif // NO_SSL_DL 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; }; // Describes a string (chunk of memory). struct vec { const char *ptr; size_t len; }; // Structure used by mg_stat() function. Uses 64 bit file length. struct mgstat { int is_directory; // Directory marker int64_t size; // File size time_t mtime; // Modification time }; // Describes 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 int is_ssl; // Is socket SSL-ed int is_proxy; }; enum { CGI_EXTENSIONS, CGI_ENVIRONMENT, PUT_DELETE_PASSWORDS_FILE, CGI_INTERPRETER, PROTECT_URI, AUTHENTICATION_DOMAIN, SSI_EXTENSIONS, ACCESS_LOG_FILE, SSL_CHAIN_FILE, ENABLE_DIRECTORY_LISTING, ERROR_LOG_FILE, GLOBAL_PASSWORDS_FILE, INDEX_FILES, ENABLE_KEEP_ALIVE, ACCESS_CONTROL_LIST, MAX_REQUEST_SIZE, EXTRA_MIME_TYPES, LISTENING_PORTS, DOCUMENT_ROOT, SSL_CERTIFICATE, NUM_THREADS, RUN_AS_USER, NUM_OPTIONS }; static const char *config_options[] = { "C", "cgi_extensions", ".cgi,.pl,.php", "E", "cgi_environment", NULL, "G", "put_delete_passwords_file", NULL, "I", "cgi_interpreter", NULL, "P", "protect_uri", NULL, "R", "authentication_domain", "mydomain.com", "S", "ssi_extensions", ".shtml,.shtm", "a", "access_log_file", NULL, "c", "ssl_chain_file", NULL, "d", "enable_directory_listing", "yes", "e", "error_log_file", NULL, "g", "global_passwords_file", NULL, "i", "index_files", "index.html,index.htm,index.cgi", "k", "enable_keep_alive", "no", "l", "access_control_list", NULL, "M", "max_request_size", "16384", "m", "extra_mime_types", NULL, "p", "listening_ports", "8080", "r", "document_root", ".", "s", "ssl_certificate", NULL, "t", "num_threads", "10", "u", "run_as_user", NULL, NULL }; #define ENTRIES_PER_CONFIG_OPTION 3 struct mg_context { int stop_flag; // Should we stop event loop SSL_CTX *ssl_ctx; // SSL context char *config[NUM_OPTIONS]; // Mongoose configuration parameters mg_callback_t user_callback; // User-defined callback function struct socket *listening_sockets; int num_threads; // Number of threads pthread_mutex_t mutex; // Protects (max|num)_threads pthread_cond_t cond; // Condvar for tracking workers terminations 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 sq_full; // Singaled when socket is produced pthread_cond_t sq_empty; // Signaled when socket is consumed }; struct mg_connection { struct mg_connection *peer; // Remote target in proxy mode struct mg_request_info request_info; struct mg_context *ctx; SSL *ssl; // SSL descriptor struct socket client; // Connected client time_t birth_time; // Time connection was accepted int64_t num_bytes_sent; // Total bytes sent to client int64_t content_len; // Content-Length header value int64_t consumed_content; // How many bytes of content is already read char *buf; // Buffer for received data int buf_size; // Buffer size int request_len; // Size of the request + headers in a buffer int data_len; // Total size of data in a buffer }; const char **mg_get_valid_option_names(void) { return config_options; } static void *call_user(struct mg_connection *conn, enum mg_event event) { return conn->ctx->user_callback == NULL ? NULL : conn->ctx->user_callback(event, conn, &conn->request_info); } static int get_option_index(const char *name) { int i; for (i = 0; config_options[i] != NULL; i += ENTRIES_PER_CONFIG_OPTION) { if (strcmp(config_options[i], name) == 0 || strcmp(config_options[i + 1], name) == 0) { return i / ENTRIES_PER_CONFIG_OPTION; } } return -1; } const char *mg_get_option(const struct mg_context *ctx, const char *name) { int i; if ((i = get_option_index(name)) == -1) { return NULL; } else if (ctx->config[i] == NULL) { return ""; } else { return ctx->config[i]; } } // Print error message to the opened error log stream. static void cry(struct mg_connection *conn, const char *fmt, ...) { char buf[BUFSIZ]; 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. conn->request_info.log_message = buf; if (call_user(conn, MG_EVENT_LOG) == NULL) { fp = conn->ctx->config[ERROR_LOG_FILE] == NULL ? NULL : 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; } // Return OpenSSL error message static const char *ssl_error(void) { unsigned long err; err = ERR_get_error(); return err == 0 ? "" : 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) static int 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 1; return 0; } #endif // !NO_CGI // HTTP 1.1 assumes keep alive if "Connection:" header is not set // This function must tolerate situations when connection info is not // set up, for example if request parsing failed. static int should_keep_alive(const struct mg_connection *conn) { const char *http_version = conn->request_info.http_version; const char *header = mg_get_header(conn, "Connection"); return (header == NULL && http_version && !strcmp(http_version, "1.1")) || (header != NULL && !strcmp(header, "keep-alive")); } static const char *suggest_connection_header(const struct mg_connection *conn) { return should_keep_alive(conn) ? "keep-alive" : "close"; } static void send_http_error(struct mg_connection *conn, int status, const char *reason, const char *fmt, ...) { char buf[BUFSIZ]; va_list ap; int len; conn->request_info.status_code = status; if (call_user(conn, MG_HTTP_ERROR) == NULL) { 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", status, reason); cry(conn, "%s", buf); buf[len++] = '\n'; va_start(ap, fmt); len += mg_vsnprintf(conn, buf + len, sizeof(buf) - len, fmt, ap); va_end(ap); } DEBUG_TRACE(("[%s]", buf)); mg_printf(conn, "HTTP/1.1 %d %s\r\n" "Content-Type: text/plain\r\n" "Content-Length: %d\r\n" "Connection: %s\r\n\r\n", status, reason, len, suggest_connection_header(conn)); conn->num_bytes_sent += mg_printf(conn, "%s", 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->signal = CreateEvent(NULL, FALSE, FALSE, NULL); cv->broadcast = CreateEvent(NULL, TRUE, FALSE, NULL); return cv->signal != NULL && cv->broadcast != NULL ? 0 : -1; } static int pthread_cond_wait(pthread_cond_t *cv, pthread_mutex_t *mutex) { HANDLE handles[] = {cv->signal, cv->broadcast}; ReleaseMutex(*mutex); WaitForMultipleObjects(2, handles, FALSE, INFINITE); return ReleaseMutex(*mutex) == 0 ? -1 : 0; } static int pthread_cond_signal(pthread_cond_t *cv) { return SetEvent(cv->signal) == 0 ? -1 : 0; } static int pthread_cond_broadcast(pthread_cond_t *cv) { // Implementation with PulseEvent() has race condition, see // http://www.cs.wustl.edu/~schmidt/win32-cv-1.html return PulseEvent(cv->broadcast) == 0 ? -1 : 0; } static int pthread_cond_destroy(pthread_cond_t *cv) { return CloseHandle(cv->signal) && CloseHandle(cv->broadcast) ? 0 : -1; } static pthread_t pthread_self(void) { return GetCurrentThreadId(); } // For Windows, change all slashes to backslashes in path names. static void change_slashes_to_backslashes(char *path) { int i; for (i = 0; path[i] != '\0'; i++) { if (path[i] == '/') path[i] = '\\'; // i > 0 check is to preserve UNC paths, like \\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[PATH_MAX], *p; mg_strlcpy(buf, path, sizeof(buf)); change_slashes_to_backslashes(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[PATH_MAX]; wchar_t wnewbuf[PATH_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[PATH_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[PATH_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[PATH_MAX]; to_unicode(path, wbuf, ARRAY_SIZE(wbuf)); return DeleteFileW(wbuf) ? 0 : -1; } static int mg_mkdir(const char *path, int mode) { char buf[PATH_MAX]; wchar_t wbuf[PATH_MAX]; mode = 0; // Unused mg_strlcpy(buf, path, sizeof(buf)); change_slashes_to_backslashes(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[PATH_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[PATH_MAX]; flags = 0; // Unused to_unicode(dll_name, wbuf, ARRAY_SIZE(wbuf)); return LoadLibraryW(wbuf); } #if !defined(NO_CGI) #define SIGKILL 0 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[PATH_MAX], buf[PATH_MAX]; FILE *fp; STARTUPINFOA si; PROCESS_INFORMATION pi; envp = NULL; // Unused (void) memset(&si, 0, sizeof(si)); (void) memset(&pi, 0, sizeof(pi)); // TODO(lsm): 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->config[CGI_INTERPRETER]; if (interp == NULL) { buf[2] = '\0'; if ((fp = fopen(cmdline, "r")) != NULL) { (void) fgets(buf, sizeof(buf), fp); if (buf[0] != '#' || buf[1] != '!') { // First line does not start with "#!". Do not set interpreter. buf[2] = '\0'; } else { // Trim whitespaces in interpreter name for (p = &buf[strlen(buf) - 1]; p > buf && isspace(*p); p--) { *p = '\0'; } } (void) fclose(fp); } interp = buf + 2; } (void) mg_snprintf(conn, cmdline, sizeof(cmdline), "%s%s%s%c%s", interp, interp[0] == '\0' ? "" : " ", dir, DIRSEP, prog); DEBUG_TRACE(("Running [%s]", cmdline)); if (CreateProcessA(NULL, cmdline, NULL, NULL, TRUE, CREATE_NEW_PROCESS_GROUP, envblk, dir, &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; } #endif /* !NO_CGI */ static int set_non_blocking_mode(SOCKET sock) { unsigned long on = 1; 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); // TODO(lsm): figure out why mongoose dies on Linux if next line is enabled // (void) pthread_attr_setstacksize(&attr, sizeof(struct mg_connection) * 5); 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_http_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(%d, 0): %s", __func__, fd_stdin, strerror(ERRNO)); } else if (dup2(fd_stdout, 1) == -1) { cry(conn, "%s: dup2(%d, 1): %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(SOCKET sock) { int flags; flags = fcntl(sock, F_GETFL, 0); (void) fcntl(sock, F_SETFL, flags | O_NONBLOCK); return 0; } #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_read(struct mg_connection *conn, void *buf, size_t len) { int n, buffered_len, nread; const char *buffered; assert(conn->content_len >= conn->consumed_content); DEBUG_TRACE(("%p %zu %lld %lld", buf, len, conn->content_len, conn->consumed_content)); nread = 0; if (strcmp(conn->request_info.request_method, "POST") == 0 && conn->consumed_content < conn->content_len) { // Adjust number of bytes to read. int64_t to_read = conn->content_len - conn->consumed_content; if (to_read < (int64_t) len) { len = (int) to_read; } // How many bytes of data we have buffered in the request buffer? buffered = conn->buf + conn->request_len; buffered_len = conn->data_len - conn->request_len; assert(buffered_len >= 0); // Return buffered data back if we haven't done that yet. if (conn->consumed_content < (int64_t) buffered_len) { buffered_len -= (int) conn->consumed_content; if (len < (size_t) buffered_len) { buffered_len = len; } memcpy(buf, buffered, buffered_len); len -= buffered_len; buf = (char *) buf + buffered_len; conn->consumed_content += buffered_len; nread = buffered_len; } // We have returned all buffered data. Read new data from the remote socket. while (len > 0) { n = pull(NULL, conn->client.sock, conn->ssl, (char *) buf, (int) len); if (n <= 0) { break; } buf = (char *) buf + n; conn->consumed_content += n; nread += n; len -= n; } } 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[BUFSIZ]; 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); } // 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, int 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. int mg_get_var(const char *buf, size_t buf_len, const char *name, char *dst, size_t dst_len) { const char *p, *e, *s; size_t name_len, len; name_len = strlen(name); e = buf + buf_len; len = -1; dst[0] = '\0'; // buf is "var1=val1&var2=val2...". Find variable first for (p = buf; p != NULL && p + name_len < e; p++) { if ((p == buf || p[-1] == '&') && p[name_len] == '=' && !mg_strncasecmp(name, p, name_len)) { // Point p to variable value p += name_len + 1; // Point s to the end of the value s = (const char *) memchr(p, '&', e - p); if (s == NULL) { s = e; } assert(s >= p); // Decode variable into destination buffer if ((size_t) (s - p) < dst_len) { len = url_decode(p, s - p, dst, dst_len, 1); } break; } } return len; } int mg_get_cookie(const struct mg_connection *conn, const char *cookie_name, char *dst, size_t dst_size) { const char *s, *p, *end; int name_len, len = -1; dst[0] = '\0'; if ((s = mg_get_header(conn, "Cookie")) == NULL) { return 0; } name_len = strlen(cookie_name); end = s + strlen(s); for (; (s = strstr(s, cookie_name)) != NULL; s += name_len) if (s[name_len] == '=') { s += name_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) { len = (p - s) + 1; mg_strlcpy(dst, s, len); } break; } return len; } // Mongoose allows to specify multiple directories to serve, // like /var/www,/~bob=/home/bob. That means that root directory depends on URI. // This function returns root dir for 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; } 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); mg_snprintf(conn, buf, buf_len, "%.*s%s", vec.len, vec.ptr, uri + match_len); #ifdef _WIN32 change_slashes_to_backslashes(buf); #endif /* _WIN32 */ DEBUG_TRACE(("[%s] -> [%s], [%.*s]", uri, buf, (int) vec.len, vec.ptr)); } static int sslize(struct mg_connection *conn, int (*func)(SSL *)) { return (conn->ssl = SSL_new(conn->ctx->ssl_ctx)) != NULL && SSL_set_fd(conn->ssl, conn->client.sock) == 1 && func(conn->ssl) == 1; } struct mg_connection *mg_connect(struct mg_connection *conn, const char *host, int port, int use_ssl) { struct mg_connection *newconn = NULL; struct sockaddr_in sin; struct hostent *he; int sock; if (conn->ctx->ssl_ctx == NULL && use_ssl) { cry(conn, "%s: SSL is not initialized", __func__); } else if ((he = gethostbyname(host)) == NULL) { cry(conn, "%s: gethostbyname(%s): %s", __func__, host, strerror(ERRNO)); } else if ((sock = socket(PF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET) { cry(conn, "%s: socket: %s", __func__, strerror(ERRNO)); } else { sin.sin_family = AF_INET; sin.sin_port = htons((uint16_t) port); sin.sin_addr = * (struct in_addr *) he->h_addr_list[0]; if (connect(sock, (struct sockaddr *) &sin, sizeof(sin)) != 0) { cry(conn, "%s: connect(%s:%d): %s", __func__, host, port, strerror(ERRNO)); closesocket(sock); } else if ((newconn = calloc(1, sizeof(*newconn))) == NULL) { cry(conn, "%s: calloc: %s", __func__, strerror(ERRNO)); closesocket(sock); } else { newconn->client.sock = sock; newconn->client.rsa.u.sin = sin; if (use_ssl) { sslize(newconn, SSL_connect); } } } return newconn; } // 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, int buflen) { const char *s, *e; int len = 0; DEBUG_TRACE(("buf: %p, len: %d", buf, buflen)); 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 month_number_to_month_name(const char *s) { size_t i; for (i = 0; i < ARRAY_SIZE(month_names); 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 parse_date_string(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 = month_number_to_month_name(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(¤t_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'; } static const struct { const char *extension; size_t ext_len; const char *mime_type; size_t mime_type_len; } builtin_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[EXTRA_MIME_TYPES]; while ((list = next_option(list, &ext_vec, &mime_vec)) != NULL) { // ext now points to the path suffix ext = path + path_len - ext_vec.len; if (mg_strncasecmp(ext, ext_vec.ptr, ext_vec.len) == 0) { *vec = mime_vec; return; } } // Now scan built-in mime types for (i = 0; builtin_mime_types[i].extension != NULL; i++) { ext = path + (path_len - builtin_mime_types[i].ext_len); if (path_len > builtin_mime_types[i].ext_len && mg_strcasecmp(ext, builtin_mime_types[i].extension) == 0) { vec->ptr = builtin_mime_types[i].mime_type; vec->len = builtin_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) // Do nothing #else 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 #define F1(x, y, z) (z ^ (x & (y ^ z))) #define F2(x, y, z) F1(z, x, y) #define F3(x, y, z) (x ^ y ^ z) #define F4(x, y, z) (y ^ (x | ~z)) #define MD5STEP(f, w, x, y, z, data, s) \ ( w += f(x, y, z) + data, w = w<>(32-s), w += x ) // Start MD5 accumulation. Set bit count to 0 and buffer to mysterious // initialization constants. static void MD5Init(MD5_CTX *ctx) { ctx->buf[0] = 0x67452301; ctx->buf[1] = 0xefcdab89; ctx->buf[2] = 0x98badcfe; ctx->buf[3] = 0x10325476; ctx->bits[0] = 0; ctx->bits[1] = 0; } static void MD5Transform(uint32_t buf[4], uint32_t const in[16]) { register uint32_t a, b, c, d; a = buf[0]; b = buf[1]; c = buf[2]; d = buf[3]; MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7); MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12); MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17); MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22); MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7); MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12); MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17); MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22); MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7); MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12); MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17); MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22); MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7); MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12); MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17); MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22); MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5); MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9); MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14); MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20); MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5); MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9); MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14); MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20); MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5); MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9); MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14); MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20); MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5); MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9); MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14); MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20); MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4); MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11); MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16); MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23); MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4); MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11); MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16); MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23); MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4); MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11); MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16); MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23); MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4); MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11); MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16); MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23); MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6); MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10); MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15); MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21); MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6); MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10); MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15); MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21); MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6); MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10); MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15); MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21); MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6); MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10); MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15); MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21); buf[0] += a; buf[1] += b; buf[2] += c; buf[3] += d; } static void MD5Update(MD5_CTX *ctx, unsigned char const *buf, unsigned len) { uint32_t t; t = ctx->bits[0]; if ((ctx->bits[0] = t + ((uint32_t) len << 3)) < t) ctx->bits[1]++; ctx->bits[1] += len >> 29; t = (t >> 3) & 0x3f; if (t) { unsigned char *p = (unsigned char *) ctx->in + t; t = 64 - t; if (len < t) { memcpy(p, buf, len); return; } memcpy(p, buf, t); byteReverse(ctx->in, 16); MD5Transform(ctx->buf, (uint32_t *) ctx->in); buf += t; len -= t; } while (len >= 64) { memcpy(ctx->in, buf, 64); byteReverse(ctx->in, 16); MD5Transform(ctx->buf, (uint32_t *) ctx->in); buf += 64; len -= 64; } memcpy(ctx->in, buf, len); } static void MD5Final(unsigned char digest[16], MD5_CTX *ctx) { unsigned count; unsigned char *p; count = (ctx->bits[0] >> 3) & 0x3F; p = ctx->in + count; *p++ = 0x80; count = 64 - 1 - count; if (count < 8) { memset(p, 0, count); byteReverse(ctx->in, 16); MD5Transform(ctx->buf, (uint32_t *) ctx->in); memset(ctx->in, 0, 56); } else { memset(p, 0, count - 8); } byteReverse(ctx->in, 14); ((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)); } #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. Buffer must be 33 bytes. 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 int check_password(const char *method, const char *ha1, const char *uri, const char *nonce, const char *nc, const char *cnonce, const char *qop, const char *response) { char ha2[32 + 1], expected_response[32 + 1]; // NOTE(lsm): due to a bug in MSIE, we do not compare the URI // TODO(lsm): check for authentication timeout if (// strcmp(dig->uri, c->ouri) != 0 || strlen(response) != 32 // || now - strtoul(dig->nonce, NULL, 10) > 3600 ) { return 0; } 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[PATH_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. for (p = path, e = p + strlen(p) - 1; e > p; e--) if (IS_DIRSEP_CHAR(*e)) break; (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 int 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 0; } // 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 1; } // Authorize against the opened passwords file. Return 1 if authorized. static int authorize(struct mg_connection *conn, FILE *fp) { struct ah ah; char line[256], f_user[256], ha1[256], f_domain[256], buf[BUFSIZ]; if (!parse_auth_header(conn, buf, sizeof(buf), &ah)) { return 0; } // 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[AUTHENTICATION_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 0; } // Return 1 if request is authorised, 0 otherwise. static int check_authorization(struct mg_connection *conn, const char *path) { FILE *fp; char fname[PATH_MAX]; struct vec uri_vec, filename_vec; const char *list; int authorized; fp = NULL; authorized = 1; list = conn->ctx->config[PROTECT_URI]; 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[AUTHENTICATION_DOMAIN], (unsigned long) time(NULL)); } static int is_authorized_for_put(struct mg_connection *conn) { FILE *fp; int ret = 0; 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; } int 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[PATH_MAX]; const char *domain; FILE *fp, *fp2; found = 0; fp = fp2 = NULL; domain = ctx->config[AUTHENTICATION_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 0; } else if ((fp2 = mg_fopen(tmp, "w+")) == NULL) { cry(fc(ctx), "Cannot open %s: %s", tmp, strerror(errno)); return 0; } // 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 1; } 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) { static const char *dont_escape = "._-$,;~()"; static const char *hex = "0123456789abcdef"; const char *end = dst + dst_len - 1; for (; *src != '\0' && dst < end; src++, dst++) { if (isalnum(*(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'; } static void print_dir_entry(struct de *de) { char size[64], mod[64], href[PATH_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, "%s%s" " %s  %s\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 directory entries by size, or name, or modification time. // On windows, __cdecl specification is needed in case if project is built // with __stdcall convention. qsort always requires __cdels callback. static int WINCDECL 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; } static void handle_directory_request(struct mg_connection *conn, const char *dir) { struct dirent *dp; DIR *dirp; struct de *entries = NULL; char path[PATH_MAX]; int i, sort_direction, num_entries = 0, arr_size = 128; if ((dirp = opendir(dir)) == NULL) { send_http_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_http_error(conn, 500, "Cannot open directory", "%s", "Error: cannot allocate memory"); return; } 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) { 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, "Index of %s" "" "

Index of %s

"
      ""
      ""
      ""
      "",
      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,
      ""
      "\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", "
NameModifiedSize
%s %s  %s
");
  conn->request_info.status_code = 200;
}

// Send len bytes from the opened file to the client.
static void send_file_data(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);
}

static void handle_file_request(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_http_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: %s\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, suggest_connection_header(conn), range);

  if (strcmp(conn->request_info.request_method, "HEAD") != 0) {
    send_file_data(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 int is_valid_http_method(const char *method) {
  return !strcmp(method, "GET") || !strcmp(method, "POST") ||
    !strcmp(method, "HEAD") || !strcmp(method, "CONNECT") ||
    !strcmp(method, "PUT") || !strcmp(method, "DELETE");
}

// Parse HTTP request, fill in mg_request_info structure.
static int parse_http_request(char *buf, struct mg_request_info *ri) {
  int status = 0;

  // RFC says that all initial whitespaces should be ingored
  while (*buf != '\0' && isspace(* (unsigned char *) buf)) {
    buf++;
  }

  ri->request_method = skip(&buf, " ");
  ri->uri = skip(&buf, " ");
  ri->http_version = skip(&buf, "\r\n");

  if (is_valid_http_method(ri->request_method) &&
      strncmp(ri->http_version, "HTTP/", 5) == 0) {
    ri->http_version += 5;   /* Skip "HTTP/" */
    parse_http_headers(&buf, ri);
    status = 1;
  }

  return status;
}

// 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, *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 int substitute_index_file(struct mg_connection *conn, char *path,
                                 size_t path_len, struct mgstat *stp) {
  const char *list = conn->ctx->config[INDEX_FILES];
  struct mgstat st;
  struct vec filename_vec;
  size_t n = strlen(path);
  int found = 0;

  // The 'path' given to us points to the directory. Remove all trailing
  // directory separator characters from the end of the path, and
  // then append single directory separator character.
  while (n > 0 && 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
  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 = 1;
      break;
    }
  }

  // If no index file exists, restore directory path
  if (!found) {
    path[n] = '\0';
  }

  return found;
}

// Return True if we should reply 304 Not Modified.
static int 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 <= parse_date_string(ims);
}

static int forward_body_data(struct mg_connection *conn, FILE *fp,
                             SOCKET sock, SSL *ssl) {
  const char *expect, *buffered;
  char buf[BUFSIZ];
  int to_read, nread, buffered_len, success = 0;

  expect = mg_get_header(conn, "Expect");
  assert(fp != NULL);

  if (conn->content_len == -1) {
    send_http_error(conn, 411, "Length Required", "");
  } else if (expect != NULL && mg_strcasecmp(expect, "100-continue")) {
    send_http_error(conn, 417, "Expectation Failed", "");
  } else {
    if (expect != NULL) {
      (void) mg_printf(conn, "%s", "HTTP/1.1 100 Continue\r\n\r\n");
    }

    buffered = conn->buf + conn->request_len;
    buffered_len = conn->data_len - conn->request_len;
    assert(buffered_len >= 0);
    assert(conn->consumed_content == 0);

    if (buffered_len > 0) {
      if ((int64_t) buffered_len > conn->content_len) {
        buffered_len = (int) conn->content_len;
      }
      push(fp, sock, ssl, buffered, (int64_t) buffered_len);
      conn->consumed_content += buffered_len;
    }

    while (conn->consumed_content < conn->content_len) {
      to_read = sizeof(buf);
      if ((int64_t) to_read > conn->content_len - conn->consumed_content) {
        to_read = (int) (conn->content_len - conn->consumed_content);
      }
      nread = pull(NULL, conn->client.sock, conn->ssl, buf, to_read);
      if (nread <= 0 || push(fp, sock, ssl, buf, nread) != nread) {
        break;
      }
      conn->consumed_content += nread;
    }

    if (conn->consumed_content == conn->content_len) {
      success = 1;
    }

    // Each error code path in this function must send an error
    if (!success) {
      send_http_error(conn, 577, http_500_error, "");
    }
  }

  return success;
}

#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, *slash;
  struct vec var_vec, root;
  char *p;
  int  i;

  blk->len = blk->nvars = 0;
  blk->conn = conn;

  get_document_root(conn, &root);

  addenv(blk, "SERVER_NAME=%s", conn->ctx->config[AUTHENTICATION_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"); // For 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);

  // SCRIPT_NAME
  assert(conn->request_info.uri[0] == '/');
  slash = strrchr(conn->request_info.uri, '/');
  if ((s = strrchr(prog, '/')) == NULL)
    s = prog;
  addenv(blk, "SCRIPT_NAME=%.*s%s", slash - conn->request_info.uri,
         conn->request_info.uri, s);

  addenv(blk, "SCRIPT_FILENAME=%s", prog);
  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 handle_cgi_request(struct mg_connection *conn, const char *prog) {
  int headers_len, data_len, i, fd_stdin[2], fd_stdout[2];
  const char *status;
  char buf[BUFSIZ], *pbuf, dir[PATH_MAX], *p;
  struct mg_request_info ri;
  struct cgi_env_block blk;
  FILE *in, *out;
  pid_t pid;

  prepare_cgi_environment(conn, prog, &blk);

  // CGI must be executed in its own directory. 'dir' must point to the
  // directory containing executable program, 'p' must point to the
  // executable program name relative to 'dir'.
  (void) mg_snprintf(conn, dir, sizeof(dir), "%s", prog);
  if ((p = strrchr(dir, DIRSEP)) != NULL) {
    *p++ = '\0';
  } else {
    dir[0] = '.', dir[1] = '\0';
    p = (char *) prog;
  }

  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_http_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_http_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") &&
      !forward_body_data(conn, in, INVALID_SOCKET, NULL)) {
    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_http_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++) {
    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_file_data(conn, out, INT64_MAX);

done:
  if (pid != (pid_t) -1) {
    kill(pid, SIGKILL);
#if !defined(_WIN32)
    do {} while (waitpid(-1, &i, WNOHANG) > 0);
#endif
  }
  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[PATH_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) {
    mg_printf(conn, "HTTP/1.1 %d OK\r\n\r\n", conn->request_info.status_code);
  } else if (rc == -1) {
    send_http_error(conn, 500, http_500_error,
        "put_dir(%s): %s", path, strerror(ERRNO));
  } else if ((fp = mg_fopen(path, "wb+")) == NULL) {
    send_http_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 (forward_body_data(conn, fp, INVALID_SOCKET, NULL))
      (void) mg_printf(conn, "HTTP/1.1 %d OK\r\n\r\n",
          conn->request_info.status_code);
    (void) fclose(fp);
  }
}

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[PATH_MAX], *p;
  struct vec root;
  int 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_file_data(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_file_data(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 = 0;
  len = 0;

  while ((ch = fgetc(fp)) != EOF) {
    if (in_ssi_tag && ch == '>') {
      in_ssi_tag = 0;
      buf[len++] = (char) ch;
      buf[len] = '\0';
      assert(len <= (int) sizeof(buf));
      if (len < 6 || memcmp(buf, "