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mongoose.c
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// Copyright (c) 2004-2013 Sergey Lyubka <valenok@gmail.com>
// Copyright (c) 2013-2014 Cesanta Software Limited
// All rights reserved
//
// This library is dual-licensed: you can redistribute it and/or modify
// it under the terms of the GNU General Public License version 2 as
// published by the Free Software Foundation. For the terms of this
// license, see <http://www.gnu.org/licenses/>.
//
// You are free to use this library under the terms of the GNU General
// Public License, but WITHOUT ANY WARRANTY; without even the implied
// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
// See the GNU General Public License for more details.
//
// Alternatively, you can license this library under a commercial
// license, as set out in <http://cesanta.com/>.
#undef UNICODE // Use ANSI WinAPI functions
#undef _UNICODE // Use multibyte encoding on Windows
#define _MBCS // Use multibyte encoding on Windows
#define _INTEGRAL_MAX_BITS 64 // Enable _stati64() on Windows
#define _CRT_SECURE_NO_WARNINGS // Disable deprecation warning in VS2005+
#undef WIN32_LEAN_AND_MEAN // Let windows.h always include winsock2.h
#define _XOPEN_SOURCE 600 // For flockfile() on Linux
#define __STDC_FORMAT_MACROS // <inttypes.h> wants this for C++
#define __STDC_LIMIT_MACROS // C++ wants that for INT64_MAX
#define _LARGEFILE_SOURCE // Enable fseeko() and ftello() functions
#define _FILE_OFFSET_BITS 64 // Enable 64-bit file offsets
#ifdef _MSC_VER
#pragma warning (disable : 4127) // FD_SET() emits warning, disable it
#pragma warning (disable : 4204) // missing c99 support
#endif
#include <sys/types.h>
#include <sys/stat.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <assert.h>
#include <errno.h>
#include <time.h>
#include <ctype.h>
#include <stdarg.h>
#ifdef _WIN32
#include <windows.h>
#include <process.h> // For _beginthread
#include <io.h> // For _lseeki64
#include <direct.h> // For _mkdir
typedef int socklen_t;
#if !defined(__MINGW32__) || !defined(_PID_T_) || defined(_NO_OLDNAMES)
typedef HANDLE pid_t;
#endif
typedef SOCKET sock_t;
typedef unsigned char uint8_t;
typedef unsigned int uint32_t;
typedef unsigned short uint16_t;
typedef unsigned __int64 uint64_t;
typedef __int64 int64_t;
typedef CRITICAL_SECTION mutex_t;
typedef struct _stati64 file_stat_t;
#pragma comment(lib, "ws2_32.lib")
#define snprintf _snprintf
#define vsnprintf _vsnprintf
#define INT64_FMT "I64d"
#ifndef EINPROGRESS
#define EINPROGRESS WSAEINPROGRESS
#endif
#ifndef EWOULDBLOCK
#define EWOULDBLOCK WSAEWOULDBLOCK
#endif
#define mutex_init(x) InitializeCriticalSection(x)
#define mutex_destroy(x) DeleteCriticalSection(x)
#define mutex_lock(x) EnterCriticalSection(x)
#define mutex_unlock(x) LeaveCriticalSection(x)
#define get_thread_id() ((unsigned long) GetCurrentThreadId())
#ifndef S_ISDIR
#define S_ISDIR(x) ((x) & _S_IFDIR)
#endif
#define sleep(x) Sleep((x) * 1000)
#define stat(x, y) mg_stat((x), (y))
#define fopen(x, y) mg_fopen((x), (y))
#define open(x, y) mg_open((x), (y))
#define lseek(x, y, z) _lseeki64((x), (y), (z))
#define mkdir(x, y) _mkdir(x)
#define to64(x) _atoi64(x)
#define flockfile(x)
#define funlockfile(x)
#ifndef va_copy
#define va_copy(x,y) x = y
#endif // MINGW #defines va_copy
#ifndef __func__
#define STRX(x) #x
#define STR(x) STRX(x)
#define __func__ __FILE__ ":" STR(__LINE__)
#endif
#else
#include <dirent.h>
#include <inttypes.h>
#include <pthread.h>
#include <pwd.h>
#include <signal.h>
#include <unistd.h>
#include <netdb.h>
#include <arpa/inet.h> // For inet_pton() when MONGOOSE_USE_IPV6 is defined
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/select.h>
#define closesocket(x) close(x)
typedef int sock_t;
typedef pthread_mutex_t mutex_t;
typedef struct stat file_stat_t;
#define mutex_init(x) pthread_mutex_init(x, NULL)
#define mutex_destroy(x) pthread_mutex_destroy(x)
#define mutex_lock(x) pthread_mutex_lock(x)
#define mutex_unlock(x) pthread_mutex_unlock(x)
#define get_thread_id() ((unsigned long) pthread_self())
#define INVALID_SOCKET ((sock_t) -1)
#define INT64_FMT PRId64
#define to64(x) strtoll(x, NULL, 10)
#define __cdecl
#define O_BINARY 0
#endif
#ifdef MONGOOSE_USE_SSL
#ifdef __APPLE__
#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
#endif
#include <openssl/ssl.h>
#endif
#include "mongoose.h"
struct ll { struct ll *prev, *next; };
#define LINKED_LIST_INIT(N) ((N)->next = (N)->prev = (N))
#define LINKED_LIST_DECLARE_AND_INIT(H) struct ll H = { &H, &H }
#define LINKED_LIST_ENTRY(P,T,N) ((T *)((char *)(P) - offsetof(T, N)))
#define LINKED_LIST_IS_EMPTY(N) ((N)->next == (N))
#define LINKED_LIST_FOREACH(H,N,T) \
for (N = (H)->next, T = (N)->next; N != (H); N = (T), T = (N)->next)
#define LINKED_LIST_ADD_TO_FRONT(H,N) do { ((H)->next)->prev = (N); \
(N)->next = ((H)->next); (N)->prev = (H); (H)->next = (N); } while (0)
#define LINKED_LIST_ADD_TO_TAIL(H,N) do { ((H)->prev)->next = (N); \
(N)->prev = ((H)->prev); (N)->next = (H); (H)->prev = (N); } while (0)
#define LINKED_LIST_REMOVE(N) do { ((N)->next)->prev = ((N)->prev); \
((N)->prev)->next = ((N)->next); LINKED_LIST_INIT(N); } while (0)
#define ARRAY_SIZE(array) (sizeof(array) / sizeof(array[0]))
#define MAX_REQUEST_SIZE 16384
#define IOBUF_SIZE 16384
#define MAX_PATH_SIZE 8192
#define LUA_SCRIPT_PATTERN "**.lp$"
#define DEFAULT_CGI_PATTERN "**.cgi$|**.pl$|**.php$"
#define CGI_ENVIRONMENT_SIZE 16384
#define MAX_CGI_ENVIR_VARS 64
#define ENV_EXPORT_TO_CGI "MONGOOSE_CGI"
#define PASSWORDS_FILE_NAME ".htpasswd"
#ifndef MONGOOSE_USE_WEBSOCKET_PING_INTERVAL
#define MONGOOSE_USE_WEBSOCKET_PING_INTERVAL 5
#endif
// Extra HTTP headers to send in every static file reply
#if !defined(MONGOOSE_USE_EXTRA_HTTP_HEADERS)
#define MONGOOSE_USE_EXTRA_HTTP_HEADERS ""
#endif
#ifndef MONGOOSE_USE_POST_SIZE_LIMIT
#define MONGOOSE_USE_POST_SIZE_LIMIT 0
#endif
#ifndef MONGOOSE_USE_IDLE_TIMEOUT_SECONDS
#define MONGOOSE_USE_IDLE_TIMEOUT_SECONDS 30
#endif
#ifdef MONGOOSE_ENABLE_DEBUG
#define DBG(x) do { printf("%-20s ", __func__); printf x; putchar('\n'); \
fflush(stdout); } while(0)
#else
#define DBG(x)
#endif
#ifdef MONGOOSE_NO_FILESYSTEM
#define MONGOOSE_NO_AUTH
#define MONGOOSE_NO_CGI
#define MONGOOSE_NO_DAV
#define MONGOOSE_NO_DIRECTORY_LISTING
#define MONGOOSE_NO_LOGGING
#endif
union socket_address {
struct sockaddr sa;
struct sockaddr_in sin;
#ifdef MONGOOSE_USE_IPV6
struct sockaddr_in6 sin6;
#endif
};
struct vec {
const char *ptr;
int len;
};
// For directory listing and WevDAV support
struct dir_entry {
struct connection *conn;
char *file_name;
file_stat_t st;
};
// NOTE(lsm): this enum shoulds be in sync with the config_options.
enum {
ACCESS_CONTROL_LIST,
#ifndef MONGOOSE_NO_FILESYSTEM
ACCESS_LOG_FILE,
#ifndef MONGOOSE_NO_AUTH
AUTH_DOMAIN,
#endif
#ifndef MONGOOSE_NO_CGI
CGI_INTERPRETER,
CGI_PATTERN,
#endif
#ifndef MONGOOSE_NO_DAV
DAV_AUTH_FILE,
#endif
DOCUMENT_ROOT,
#ifndef MONGOOSE_NO_DIRECTORY_LISTING
ENABLE_DIRECTORY_LISTING,
#endif
#endif
EXTRA_MIME_TYPES,
#if !defined(MONGOOSE_NO_FILESYSTEM) && !defined(MONGOOSE_NO_AUTH)
GLOBAL_AUTH_FILE,
#endif
HIDE_FILES_PATTERN,
#ifndef MONGOOSE_NO_FILESYSTEM
INDEX_FILES,
#endif
LISTENING_PORT,
#ifndef _WIN32
RUN_AS_USER,
#endif
#ifdef MONGOOSE_USE_SSL
SSL_CERTIFICATE,
#endif
URL_REWRITES,
NUM_OPTIONS
};
static const char *static_config_options[] = {
"access_control_list", NULL,
#ifndef MONGOOSE_NO_FILESYSTEM
"access_log_file", NULL,
#ifndef MONGOOSE_NO_AUTH
"auth_domain", "mydomain.com",
#endif
#ifndef MONGOOSE_NO_CGI
"cgi_interpreter", NULL,
"cgi_pattern", DEFAULT_CGI_PATTERN,
#endif
#ifndef MONGOOSE_NO_DAV
"dav_auth_file", NULL,
#endif
"document_root", NULL,
#ifndef MONGOOSE_NO_DIRECTORY_LISTING
"enable_directory_listing", "yes",
#endif
#endif
"extra_mime_types", NULL,
#if !defined(MONGOOSE_NO_FILESYSTEM) && !defined(MONGOOSE_NO_AUTH)
"global_auth_file", NULL,
#endif
"hide_files_patterns", NULL,
#ifndef MONGOOSE_NO_FILESYSTEM
"index_files","index.html,index.htm,index.cgi,index.php,index.lp",
#endif
"listening_port", NULL,
#ifndef _WIN32
"run_as_user", NULL,
#endif
#ifdef MONGOOSE_USE_SSL
"ssl_certificate", NULL,
#endif
"url_rewrites", NULL,
NULL
};
struct mg_server {
sock_t listening_sock;
union socket_address lsa; // Listening socket address
struct ll active_connections;
mg_handler_t request_handler;
mg_handler_t error_handler;
mg_handler_t auth_handler;
char *config_options[NUM_OPTIONS];
char local_ip[48];
void *server_data;
#ifdef MONGOOSE_USE_SSL
SSL_CTX *ssl_ctx; // Server SSL context
SSL_CTX *client_ssl_ctx; // Client SSL context
#endif
sock_t ctl[2]; // Control socketpair. Used to wake up from select() call
};
// Expandable IO buffer
struct iobuf {
char *buf; // Buffer that holds the data
int size; // Buffer size
int len; // Number of bytes currently in a buffer
};
// Local endpoint representation
union endpoint {
int fd; // Opened regular local file
sock_t cgi_sock; // CGI socket
void *ssl; // SSL descriptor
};
enum endpoint_type { EP_NONE, EP_FILE, EP_CGI, EP_USER, EP_PUT, EP_CLIENT };
enum connection_flags {
CONN_CLOSE = 1, // Connection must be closed at the end of the poll
CONN_SPOOL_DONE = 2, // All data has been buffered for sending
CONN_SSL_HANDS_SHAKEN = 4, // SSL handshake has completed. Only for SSL
CONN_HEADERS_SENT = 8, // User callback has sent HTTP headers
CONN_BUFFER = 16, // CGI only. Holds data send until CGI prints
// all HTTP headers
CONN_CONNECTING = 32, // HTTP client is doing non-blocking connect()
CONN_LONG_RUNNING = 64 // Long-running URI handlers
};
struct connection {
struct mg_connection mg_conn; // XXX: Must be first
struct ll link; // Linkage to server->active_connections
struct mg_server *server;
sock_t client_sock; // Connected client
struct iobuf local_iobuf;
struct iobuf remote_iobuf;
union endpoint endpoint;
enum endpoint_type endpoint_type;
time_t birth_time;
time_t last_activity_time;
char *path_info;
char *request;
int64_t num_bytes_sent; // Total number of bytes sent
int64_t cl; // Reply content length, for Range support
int request_len; // Request length, including last \r\n after last header
int flags; // CONN_* flags: CONN_CLOSE, CONN_SPOOL_DONE, etc
mg_handler_t handler; // Callback for HTTP client
#ifdef MONGOOSE_USE_SSL
SSL *ssl; // SSL descriptor
#endif
};
static void open_local_endpoint(struct connection *conn, int skip_user);
static void close_local_endpoint(struct connection *conn);
static const struct {
const char *extension;
size_t ext_len;
const char *mime_type;
} static_builtin_mime_types[] = {
{".html", 5, "text/html"},
{".htm", 4, "text/html"},
{".shtm", 5, "text/html"},
{".shtml", 6, "text/html"},
{".css", 4, "text/css"},
{".js", 3, "application/x-javascript"},
{".ico", 4, "image/x-icon"},
{".gif", 4, "image/gif"},
{".jpg", 4, "image/jpeg"},
{".jpeg", 5, "image/jpeg"},
{".png", 4, "image/png"},
{".svg", 4, "image/svg+xml"},
{".txt", 4, "text/plain"},
{".torrent", 8, "application/x-bittorrent"},
{".wav", 4, "audio/x-wav"},
{".mp3", 4, "audio/x-mp3"},
{".mid", 4, "audio/mid"},
{".m3u", 4, "audio/x-mpegurl"},
{".ogg", 4, "application/ogg"},
{".ram", 4, "audio/x-pn-realaudio"},
{".xml", 4, "text/xml"},
{".json", 5, "text/json"},
{".xslt", 5, "application/xml"},
{".xsl", 4, "application/xml"},
{".ra", 3, "audio/x-pn-realaudio"},
{".doc", 4, "application/msword"},
{".exe", 4, "application/octet-stream"},
{".zip", 4, "application/x-zip-compressed"},
{".xls", 4, "application/excel"},
{".tgz", 4, "application/x-tar-gz"},
{".tar", 4, "application/x-tar"},
{".gz", 3, "application/x-gunzip"},
{".arj", 4, "application/x-arj-compressed"},
{".rar", 4, "application/x-arj-compressed"},
{".rtf", 4, "application/rtf"},
{".pdf", 4, "application/pdf"},
{".swf", 4, "application/x-shockwave-flash"},
{".mpg", 4, "video/mpeg"},
{".webm", 5, "video/webm"},
{".mpeg", 5, "video/mpeg"},
{".mov", 4, "video/quicktime"},
{".mp4", 4, "video/mp4"},
{".m4v", 4, "video/x-m4v"},
{".asf", 4, "video/x-ms-asf"},
{".avi", 4, "video/x-msvideo"},
{".bmp", 4, "image/bmp"},
{".ttf", 4, "application/x-font-ttf"},
{NULL, 0, NULL}
};
#ifndef MONGOOSE_NO_THREADS
void *mg_start_thread(void *(*f)(void *), void *p) {
#ifdef _WIN32
return (void *) _beginthread((void (__cdecl *)(void *)) f, 0, p);
#else
pthread_t thread_id = (pthread_t) 0;
pthread_attr_t attr;
(void) pthread_attr_init(&attr);
(void) pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
#if MONGOOSE_USE_STACK_SIZE > 1
(void) pthread_attr_setstacksize(&attr, MONGOOSE_USE_STACK_SIZE);
#endif
pthread_create(&thread_id, &attr, f, p);
pthread_attr_destroy(&attr);
return (void *) thread_id;
#endif
}
#endif // MONGOOSE_NO_THREADS
#ifdef _WIN32
// Encode 'path' which is assumed UTF-8 string, into UNICODE string.
// wbuf and wbuf_len is a target buffer and its length.
static void to_wchar(const char *path, wchar_t *wbuf, size_t wbuf_len) {
char buf[MAX_PATH_SIZE * 2], buf2[MAX_PATH_SIZE * 2], *p;
strncpy(buf, path, sizeof(buf));
buf[sizeof(buf) - 1] = '\0';
// Trim trailing slashes
p = buf + strlen(buf) - 1;
while (p > buf && p[0] == '\\' || p[0] == '/') *p-- = '\0';
//change_slashes_to_backslashes(buf);
// Convert to Unicode and back. If doubly-converted string does not
// match the original, something is fishy, reject.
memset(wbuf, 0, wbuf_len * sizeof(wchar_t));
MultiByteToWideChar(CP_UTF8, 0, buf, -1, wbuf, (int) wbuf_len);
WideCharToMultiByte(CP_UTF8, 0, wbuf, (int) wbuf_len, buf2, sizeof(buf2),
NULL, NULL);
if (strcmp(buf, buf2) != 0) {
wbuf[0] = L'\0';
}
}
static int mg_stat(const char *path, file_stat_t *st) {
wchar_t wpath[MAX_PATH_SIZE];
to_wchar(path, wpath, ARRAY_SIZE(wpath));
DBG(("[%ls] -> %d", wpath, _wstati64(wpath, st)));
return _wstati64(wpath, st);
}
static FILE *mg_fopen(const char *path, const char *mode) {
wchar_t wpath[MAX_PATH_SIZE], wmode[10];
to_wchar(path, wpath, ARRAY_SIZE(wpath));
to_wchar(mode, wmode, ARRAY_SIZE(wmode));
return _wfopen(wpath, wmode);
}
static int mg_open(const char *path, int flag) {
wchar_t wpath[MAX_PATH_SIZE];
to_wchar(path, wpath, ARRAY_SIZE(wpath));
return _wopen(wpath, flag);
}
#endif
static void set_close_on_exec(int fd) {
#ifdef _WIN32
(void) SetHandleInformation((HANDLE) fd, HANDLE_FLAG_INHERIT, 0);
#else
fcntl(fd, F_SETFD, FD_CLOEXEC);
#endif
}
static void set_non_blocking_mode(sock_t sock) {
#ifdef _WIN32
unsigned long on = 1;
ioctlsocket(sock, FIONBIO, &on);
#else
int flags = fcntl(sock, F_GETFL, 0);
fcntl(sock, F_SETFL, flags | O_NONBLOCK);
#endif
}
// A helper function for traversing a comma separated list of values.
// It returns a list pointer shifted to the next value, or NULL if the end
// of the list found.
// Value is stored in val vector. If value has form "x=y", then eq_val
// vector is initialized to point to the "y" part, and val vector length
// is adjusted to point only to "x".
static const char *next_option(const char *list, struct vec *val,
struct vec *eq_val) {
if (list == NULL || *list == '\0') {
// End of the list
list = NULL;
} else {
val->ptr = list;
if ((list = strchr(val->ptr, ',')) != NULL) {
// Comma found. Store length and shift the list ptr
val->len = list - val->ptr;
list++;
} else {
// This value is the last one
list = val->ptr + strlen(val->ptr);
val->len = list - val->ptr;
}
if (eq_val != NULL) {
// Value has form "x=y", adjust pointers and lengths
// so that val points to "x", and eq_val points to "y".
eq_val->len = 0;
eq_val->ptr = (const char *) memchr(val->ptr, '=', val->len);
if (eq_val->ptr != NULL) {
eq_val->ptr++; // Skip over '=' character
eq_val->len = val->ptr + val->len - eq_val->ptr;
val->len = (eq_val->ptr - val->ptr) - 1;
}
}
}
return list;
}
static int spool(struct iobuf *io, const void *buf, int len) {
static const double mult = 1.2;
char *p = NULL;
int new_len = 0;
assert(io->len >= 0);
assert(io->len <= io->size);
//DBG(("1. %d %d %d", len, io->len, io->size));
if (len <= 0) {
} else if ((new_len = io->len + len) < io->size) {
memcpy(io->buf + io->len, buf, len);
io->len = new_len;
} else if ((p = (char *) realloc(io->buf, (int) (new_len * mult))) != NULL) {
io->buf = p;
memcpy(io->buf + io->len, buf, len);
io->len = new_len;
io->size = (int) (new_len * mult);
} else {
len = 0;
}
//DBG(("%d %d %d", len, io->len, io->size));
return len;
}
// Like snprintf(), but never returns negative value, or a value
// that is larger than a supplied buffer.
static int mg_vsnprintf(char *buf, size_t buflen, const char *fmt, va_list ap) {
int n;
if (buflen < 1) return 0;
n = vsnprintf(buf, buflen, fmt, ap);
if (n < 0) {
n = 0;
} else if (n >= (int) buflen) {
n = (int) buflen - 1;
}
buf[n] = '\0';
return n;
}
static int mg_snprintf(char *buf, size_t buflen, const char *fmt, ...) {
va_list ap;
int n;
va_start(ap, fmt);
n = mg_vsnprintf(buf, buflen, fmt, ap);
va_end(ap);
return n;
}
// Check whether full request is buffered. Return:
// -1 if request is malformed
// 0 if request is not yet fully buffered
// >0 actual request length, including last \r\n\r\n
static int get_request_len(const char *s, int buf_len) {
const unsigned char *buf = (unsigned char *) s;
int i;
for (i = 0; i < buf_len; i++) {
// Control characters are not allowed but >=128 are.
// Abort scan as soon as one malformed character is found.
if (!isprint(buf[i]) && buf[i] != '\r' && buf[i] != '\n' && buf[i] < 128) {
return -1;
} else if (buf[i] == '\n' && i + 1 < buf_len && buf[i + 1] == '\n') {
return i + 2;
} else if (buf[i] == '\n' && i + 2 < buf_len && buf[i + 1] == '\r' &&
buf[i + 2] == '\n') {
return i + 3;
}
}
return 0;
}
// Skip the characters until one of the delimiters characters found.
// 0-terminate resulting word. Skip the rest of the delimiters if any.
// Advance pointer to buffer to the next word. Return found 0-terminated word.
static char *skip(char **buf, const char *delimiters) {
char *p, *begin_word, *end_word, *end_delimiters;
begin_word = *buf;
end_word = begin_word + strcspn(begin_word, delimiters);
end_delimiters = end_word + strspn(end_word, delimiters);
for (p = end_word; p < end_delimiters; p++) {
*p = '\0';
}
*buf = end_delimiters;
return begin_word;
}
// Parse HTTP headers from the given buffer, advance buffer to the point
// where parsing stopped.
static void parse_http_headers(char **buf, struct mg_connection *ri) {
size_t i;
for (i = 0; i < ARRAY_SIZE(ri->http_headers); i++) {
ri->http_headers[i].name = skip(buf, ": ");
ri->http_headers[i].value = skip(buf, "\r\n");
if (ri->http_headers[i].name[0] == '\0')
break;
ri->num_headers = i + 1;
}
}
static const char *status_code_to_str(int status_code) {
switch (status_code) {
case 200: return "OK";
case 201: return "Created";
case 204: return "No Content";
case 301: return "Moved Permanently";
case 302: return "Found";
case 304: return "Not Modified";
case 400: return "Bad Request";
case 403: return "Forbidden";
case 404: return "Not Found";
case 405: return "Method Not Allowed";
case 409: return "Conflict";
case 411: return "Length Required";
case 413: return "Request Entity Too Large";
case 415: return "Unsupported Media Type";
case 423: return "Locked";
case 500: return "Server Error";
case 501: return "Not Implemented";
default: return "Server Error";
}
}
static void send_http_error(struct connection *conn, int code,
const char *fmt, ...) {
const char *message = status_code_to_str(code);
const char *rewrites = conn->server->config_options[URL_REWRITES];
char headers[200], body[200];
struct vec a, b;
va_list ap;
int body_len, headers_len, match_code;
conn->mg_conn.status_code = code;
// Invoke error handler if it is set
if (conn->server->error_handler != NULL &&
conn->server->error_handler(&conn->mg_conn) == MG_ERROR_PROCESSED) {
close_local_endpoint(conn);
return;
}
// Handle error code rewrites
while ((rewrites = next_option(rewrites, &a, &b)) != NULL) {
if ((match_code = atoi(a.ptr)) > 0 && match_code == code) {
conn->mg_conn.status_code = 302;
mg_printf(&conn->mg_conn, "HTTP/1.1 %d Moved\r\n"
"Location: %.*s?code=%d&orig_uri=%s\r\n\r\n",
conn->mg_conn.status_code, b.len, b.ptr, code,
conn->mg_conn.uri);
close_local_endpoint(conn);
return;
}
}
body_len = mg_snprintf(body, sizeof(body), "%d %s\n", code, message);
if (fmt != NULL) {
va_start(ap, fmt);
body_len += mg_vsnprintf(body + body_len, sizeof(body) - body_len, fmt, ap);
va_end(ap);
}
if (code >= 300 && code <= 399) {
// 3xx errors do not have body
body_len = 0;
}
headers_len = mg_snprintf(headers, sizeof(headers),
"HTTP/1.1 %d %s\r\nContent-Length: %d\r\n"
"Content-Type: text/plain\r\n\r\n",
code, message, body_len);
spool(&conn->remote_iobuf, headers, headers_len);
spool(&conn->remote_iobuf, body, body_len);
close_local_endpoint(conn); // This will write to the log file
}
// Print message to buffer. If buffer is large enough to hold the message,
// return buffer. If buffer is to small, allocate large enough buffer on heap,
// and return allocated buffer.
static int alloc_vprintf(char **buf, size_t size, const char *fmt, va_list ap) {
va_list ap_copy;
int len;
// Windows is not standard-compliant, and vsnprintf() returns -1 if
// buffer is too small. Also, older versions of msvcrt.dll do not have
// _vscprintf(). However, if size is 0, vsnprintf() behaves correctly.
// Therefore, we make two passes: on first pass, get required message length.
// On second pass, actually print the message.
va_copy(ap_copy, ap);
len = vsnprintf(NULL, 0, fmt, ap_copy);
if (len > (int) size &&
(size = len + 1) > 0 &&
(*buf = (char *) malloc(size)) == NULL) {
len = -1; // Allocation failed, mark failure
} else {
va_copy(ap_copy, ap);
vsnprintf(*buf, size, fmt, ap_copy);
}
return len;
}
static void write_chunk(struct connection *conn, const char *buf, int len) {
char chunk_size[50];
int n = mg_snprintf(chunk_size, sizeof(chunk_size), "%X\r\n", len);
spool(&conn->remote_iobuf, chunk_size, n);
spool(&conn->remote_iobuf, buf, len);
spool(&conn->remote_iobuf, "\r\n", 2);
}
int mg_vprintf(struct mg_connection *conn, const char *fmt, va_list ap,
int chunked) {
char mem[IOBUF_SIZE], *buf = mem;
int len;
if ((len = alloc_vprintf(&buf, sizeof(mem), fmt, ap)) > 0) {
if (chunked) {
write_chunk((struct connection *) conn, buf, len);
} else {
len = mg_write(conn, buf, (size_t) len);
}
}
if (buf != mem && buf != NULL) {
free(buf);
}
return len;
}
int mg_printf(struct mg_connection *conn, const char *fmt, ...) {
int len;
va_list ap;
va_start(ap, fmt);
len = mg_vprintf(conn, fmt, ap, 0);
va_end(ap);
return len;
}
static int mg_socketpair(sock_t sp[2]) {
struct sockaddr_in sa;
sock_t sock, ret = -1;
socklen_t len = sizeof(sa);
sp[0] = sp[1] = INVALID_SOCKET;
(void) memset(&sa, 0, sizeof(sa));
sa.sin_family = AF_INET;
sa.sin_port = htons(0);
sa.sin_addr.s_addr = htonl(0x7f000001);
if ((sock = socket(AF_INET, SOCK_STREAM, 0)) != INVALID_SOCKET &&
!bind(sock, (struct sockaddr *) &sa, len) &&
!listen(sock, 1) &&
!getsockname(sock, (struct sockaddr *) &sa, &len) &&
(sp[0] = socket(AF_INET, SOCK_STREAM, 6)) != -1 &&
!connect(sp[0], (struct sockaddr *) &sa, len) &&
(sp[1] = accept(sock,(struct sockaddr *) &sa, &len)) != INVALID_SOCKET) {
set_close_on_exec(sp[0]);
set_close_on_exec(sp[1]);
ret = 0;
} else {
if (sp[0] != INVALID_SOCKET) closesocket(sp[0]);
if (sp[1] != INVALID_SOCKET) closesocket(sp[1]);
sp[0] = sp[1] = INVALID_SOCKET;
}
closesocket(sock);
return ret;
}
static int is_error(int n) {
return n == 0 ||
(n < 0 && errno != EINTR && errno != EINPROGRESS &&
errno != EAGAIN && errno != EWOULDBLOCK
#ifdef _WIN32
&& WSAGetLastError() != WSAEINTR && WSAGetLastError() != WSAEWOULDBLOCK
#endif
);
}
static void discard_leading_iobuf_bytes(struct iobuf *io, int n) {
if (n >= 0 && n <= io->len) {
memmove(io->buf, io->buf + n, io->len - n);
io->len -= n;
}
}
#ifndef MONGOOSE_NO_CGI
#ifdef _WIN32
struct threadparam {
sock_t s;
HANDLE hPipe;
};
static int wait_until_ready(sock_t sock, int for_read) {
fd_set set;
FD_ZERO(&set);
FD_SET(sock, &set);
select(sock + 1, for_read ? &set : 0, for_read ? 0 : &set, 0, 0);
return 1;
}
static void *push_to_stdin(void *arg) {
struct threadparam *tp = arg;
int n, sent, stop = 0;
DWORD k;
char buf[IOBUF_SIZE];
while (!stop && wait_until_ready(tp->s, 1) &&
(n = recv(tp->s, buf, sizeof(buf), 0)) > 0) {
if (n == -1 && GetLastError() == WSAEWOULDBLOCK) continue;
for (sent = 0; !stop && sent < n; sent += k) {
if (!WriteFile(tp->hPipe, buf + sent, n - sent, &k, 0)) stop = 1;
}
}
DBG(("%s", "FORWARED EVERYTHING TO CGI"));
CloseHandle(tp->hPipe);
free(tp);
_endthread();
return NULL;
}
static void *pull_from_stdout(void *arg) {
struct threadparam *tp = arg;
int k, stop = 0;
DWORD n, sent;
char buf[IOBUF_SIZE];
while (!stop && ReadFile(tp->hPipe, buf, sizeof(buf), &n, NULL)) {
for (sent = 0; !stop && sent < n; sent += k) {
if (wait_until_ready(tp->s, 0) &&
(k = send(tp->s, buf + sent, n - sent, 0)) <= 0) stop = 1;
}
}
DBG(("%s", "EOF FROM CGI"));
CloseHandle(tp->hPipe);
shutdown(tp->s, 2); // Without this, IO thread may get truncated data
closesocket(tp->s);
free(tp);
_endthread();
return NULL;
}
static void spawn_stdio_thread(sock_t sock, HANDLE hPipe,
void *(*func)(void *)) {
struct threadparam *tp = malloc(sizeof(*tp));
if (tp != NULL) {
tp->s = sock;
tp->hPipe = hPipe;
mg_start_thread(func, tp);
}
}
static void abs_path(const char *utf8_path, char *abs_path, size_t len) {
wchar_t buf[MAX_PATH_SIZE], buf2[MAX_PATH_SIZE];
to_wchar(utf8_path, buf, ARRAY_SIZE(buf));
GetFullPathNameW(buf, ARRAY_SIZE(buf2), buf2, NULL);
WideCharToMultiByte(CP_UTF8, 0, buf2, wcslen(buf2) + 1, abs_path, len, 0, 0);
}
static pid_t start_process(char *interp, const char *cmd, const char *env,
const char *envp[], const char *dir, sock_t sock) {
STARTUPINFOW si = {0};
PROCESS_INFORMATION pi = {0};
HANDLE a[2], b[2], me = GetCurrentProcess();
wchar_t wcmd[MAX_PATH_SIZE], full_dir[MAX_PATH_SIZE];
char buf[MAX_PATH_SIZE], buf4[MAX_PATH_SIZE], buf5[MAX_PATH_SIZE],
cmdline[MAX_PATH_SIZE], *p;
DWORD flags = DUPLICATE_CLOSE_SOURCE | DUPLICATE_SAME_ACCESS;
FILE *fp;
si.cb = sizeof(si);
si.dwFlags = STARTF_USESTDHANDLES | STARTF_USESHOWWINDOW;
si.wShowWindow = SW_HIDE;
si.hStdError = GetStdHandle(STD_ERROR_HANDLE);
CreatePipe(&a[0], &a[1], NULL, 0);
CreatePipe(&b[0], &b[1], NULL, 0);
DuplicateHandle(me, a[0], me, &si.hStdInput, 0, TRUE, flags);
DuplicateHandle(me, b[1], me, &si.hStdOutput, 0, TRUE, flags);
if (interp == NULL && (fp = fopen(cmd, "r")) != NULL) {
buf[0] = buf[1] = '\0';
fgets(buf, sizeof(buf), fp);
buf[sizeof(buf) - 1] = '\0';
if (buf[0] == '#' && buf[1] == '!') {
interp = buf + 2;
for (p = interp + strlen(interp);
isspace(* (uint8_t *) p) && p > interp; p--) *p = '\0';
}
fclose(fp);
}
if (interp != NULL) {
abs_path(interp, buf4, ARRAY_SIZE(buf4));
interp = buf4;
}
abs_path(dir, buf5, ARRAY_SIZE(buf5));
to_wchar(dir, full_dir, ARRAY_SIZE(full_dir));
mg_snprintf(cmdline, sizeof(cmdline), "%s%s\"%s\"",
interp ? interp : "", interp ? " " : "", cmd);
to_wchar(cmdline, wcmd, ARRAY_SIZE(wcmd));
if (CreateProcessW(NULL, wcmd, NULL, NULL, TRUE, CREATE_NEW_PROCESS_GROUP,
(void *) env, full_dir, &si, &pi) != 0) {
spawn_stdio_thread(sock, a[1], push_to_stdin);
spawn_stdio_thread(sock, b[0], pull_from_stdout);
} else {
CloseHandle(a[1]);
CloseHandle(b[0]);
closesocket(sock);
}
DBG(("CGI command: [%ls] -> %p", wcmd, pi.hProcess));
CloseHandle(si.hStdOutput);
CloseHandle(si.hStdInput);
CloseHandle(a[0]);
CloseHandle(b[1]);
CloseHandle(pi.hThread);
CloseHandle(pi.hProcess);
return pi.hProcess;
}
#else
static pid_t start_process(const char *interp, const char *cmd, const char *env,
const char *envp[], const char *dir, sock_t sock) {
char buf[500];
pid_t pid = fork();
(void) env;
if (pid == 0) {
(void) chdir(dir);
(void) dup2(sock, 0);
(void) dup2(sock, 1);
closesocket(sock);
// After exec, all signal handlers are restored to their default values,
// with one exception of SIGCHLD. According to POSIX.1-2001 and Linux's
// implementation, SIGCHLD's handler will leave unchanged after exec
// if it was set to be ignored. Restore it to default action.
signal(SIGCHLD, SIG_DFL);
if (interp == NULL) {
execle(cmd, cmd, NULL, envp);
} else {
execle(interp, interp, cmd, NULL, envp);
}
snprintf(buf, sizeof(buf), "Status: 500\r\n\r\n"
"500 Server Error: %s%s%s: %s", interp == NULL ? "" : interp,
interp == NULL ? "" : " ", cmd, strerror(errno));
send(1, buf, strlen(buf), 0);
exit(EXIT_FAILURE); // exec call failed
}
return pid;