main.c

   1 /*
   2  * uhttpd - Tiny single-threaded httpd
   3  *
   4  *   Copyright (C) 2010-2012 Jo-Philipp Wich <xm@subsignal.org>
   5  *   Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
   6  *
   7  *  Licensed under the Apache License, Version 2.0 (the "License");
   8  *  you may not use this file except in compliance with the License.
   9  *  You may obtain a copy of the License at
  10  *
  11  *      http://www.apache.org/licenses/LICENSE-2.0
  12  *
  13  *  Unless required by applicable law or agreed to in writing, software
  14  *  distributed under the License is distributed on an "AS IS" BASIS,
  15  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  16  *  See the License for the specific language governing permissions and
  17  *  limitations under the License.
  18  */
  19
  20 #include <sys/types.h>
  21 #include <sys/socket.h>
  22 #include <netinet/in.h>
  23
  24 #include <getopt.h>
  25 #include <errno.h>
  26 #include <netdb.h>
  27 #include <signal.h>
  28
  29 #include <libubox/usock.h>
  30
  31 #include "uhttpd.h"
  32
  33
  34 static int run_server(void)
  35 {
  36         uloop_init();
  37         uh_setup_listeners();
  38         uloop_run();
  39
  40         return 0;
  41 }
  42
  43 static void uh_config_parse(void)
  44 {
  45         const char *path = conf.file;
  46         FILE *c;
  47         char line[512];
  48         char *col1;
  49         char *col2;
  50         char *eol;
  51
  52         if (!path)
  53                 path = "/etc/httpd.conf";
  54
  55         c = fopen(path, "r");
  56         if (!c)
  57                 return;
  58
  59         memset(line, 0, sizeof(line));
  60
  61         while (fgets(line, sizeof(line) - 1, c)) {
  62                 if ((line[0] == '/') && (strchr(line, ':') != NULL)) {
  63                         if (!(col1 = strchr(line, ':')) || (*col1++ = 0) ||
  64                                 !(col2 = strchr(col1, ':')) || (*col2++ = 0) ||
  65                                 !(eol = strchr(col2, '\n')) || (*eol++  = 0))
  66                                 continue;
  67
  68                         uh_auth_add(line, col1, col2);
  69                 } else if (!strncmp(line, "I:", 2)) {
  70                         if (!(col1 = strchr(line, ':')) || (*col1++ = 0) ||
  71                                 !(eol = strchr(col1, '\n')) || (*eol++  = 0))
  72                                 continue;
  73
  74                         uh_index_add(strdup(col1));
  75                 } else if (!strncmp(line, "E404:", 5)) {
  76                         if (!(col1 = strchr(line, ':')) || (*col1++ = 0) ||
  77                                 !(eol = strchr(col1, '\n')) || (*eol++  = 0))
  78                                 continue;
  79
  80                         conf.error_handler = strdup(col1);
  81                 }
  82 #ifdef HAVE_CGI
  83                 else if ((line[0] == '*') && (strchr(line, ':') != NULL)) {
  84                         if (!(col1 = strchr(line, '*')) || (*col1++ = 0) ||
  85                                 !(col2 = strchr(col1, ':')) || (*col2++ = 0) ||
  86                                 !(eol = strchr(col2, '\n')) || (*eol++  = 0))
  87                                 continue;
  88
  89                         if (!uh_interpreter_add(col1, col2))
  90                                 fprintf(stderr,
  91                                                 "Unable to add interpreter %s for extension %s: "
  92                                                 "Out of memory\n", col2, col1
  93                                 );
  94                 }
  95 #endif
  96         }
  97
  98         fclose(c);
  99 }
 100
 101 static int add_listener_arg(char *arg, bool tls)
 102 {
 103         char *host = NULL;
 104         char *port = arg;
 105         char *s;
 106
 107         s = strrchr(arg, ':');
 108         if (s) {
 109                 host = arg;
 110                 port = s + 1;
 111                 *s = 0;
 112         }
 113
 114         return uh_socket_bind(host, port, tls);
 115 }
 116
 117 static int usage(const char *name)
 118 {
 119         fprintf(stderr,
 120                 "Usage: %s -p [addr:]port -h docroot\n"
 121                 "       -f              Do not fork to background\n"
 122                 "       -c file         Configuration file, default is '/etc/httpd.conf'\n"
 123                 "       -p [addr:]port  Bind to specified address and port, multiple allowed\n"
 124 #ifdef HAVE_TLS
 125                 "       -s [addr:]port  Like -p but provide HTTPS on this port\n"
 126                 "       -C file         ASN.1 server certificate file\n"
 127                 "       -K file         ASN.1 server private key file\n"
 128 #endif
 129                 "       -h directory    Specify the document root, default is '.'\n"
 130                 "       -E string       Use given virtual URL as 404 error handler\n"
 131                 "       -I string       Use given filename as index for directories, multiple allowed\n"
 132                 "       -S              Do not follow symbolic links outside of the docroot\n"
 133                 "       -D              Do not allow directory listings, send 403 instead\n"
 134                 "       -R              Enable RFC1918 filter\n"
 135                 "       -n count        Maximum allowed number of concurrent requests\n"
 136 #ifdef HAVE_LUA
 137                 "       -l string       URL prefix for Lua handler, default is '/lua'\n"
 138                 "       -L file         Lua handler script, omit to disable Lua\n"
 139 #endif
 140 #ifdef HAVE_UBUS
 141                 "       -u string       URL prefix for HTTP/JSON handler\n"
 142                 "       -U file         Override ubus socket path\n"
 143 #endif
 144 #ifdef HAVE_CGI
 145                 "       -x string       URL prefix for CGI handler, default is '/cgi-bin'\n"
 146                 "       -i .ext=path    Use interpreter at path for files with the given extension\n"
 147 #endif
 148 #if defined(HAVE_CGI) || defined(HAVE_LUA) || defined(HAVE_UBUS)
 149                 "       -t seconds      CGI, Lua and UBUS script timeout in seconds, default is 60\n"
 150 #endif
 151                 "       -T seconds      Network timeout in seconds, default is 30\n"
 152                 "       -d string       URL decode given string\n"
 153                 "       -r string       Specify basic auth realm\n"
 154                 "       -m string       MD5 crypt given string\n"
 155                 "\n", name
 156         );
 157         return 1;
 158 }
 159
 160 static void init_defaults(void)
 161 {
 162         conf.network_timeout = 30;
 163         conf.http_keepalive = 0; /* fixme */
 164         conf.max_requests = 3;
 165
 166         uh_index_add("index.html");
 167         uh_index_add("index.htm");
 168         uh_index_add("default.html");
 169         uh_index_add("default.htm");
 170 }
 171
 172 int main(int argc, char **argv)
 173 {
 174         bool nofork = false;
 175         char *port;
 176         int opt, ch;
 177         int cur_fd;
 178         int bound = 0;
 179
 180         init_defaults();
 181         signal(SIGPIPE, SIG_IGN);
 182
 183         while ((ch = getopt(argc, argv, "fSDRC:K:E:I:p:s:h:c:l:L:d:r:m:n:x:i:t:T:A:u:U:")) != -1) {
 184                 bool tls = false;
 185
 186                 switch(ch) {
 187                 case 's':
 188                         tls = true;
 189                         /* fall through */
 190                 case 'p':
 191                         bound += add_listener_arg(optarg, tls);
 192                         break;
 193
 194                 case 'h':
 195                         if (!realpath(optarg, conf.docroot)) {
 196                                 fprintf(stderr, "Error: Invalid directory %s: %s\n",
 197                                                 optarg, strerror(errno));
 198                                 exit(1);
 199                         }
 200                         break;
 201
 202                 case 'E':
 203                         if (optarg[0] != '/') {
 204                                 fprintf(stderr, "Error: Invalid error handler: %s\n",
 205                                                 optarg);
 206                                 exit(1);
 207                         }
 208                         conf.error_handler = optarg;
 209                         break;
 210
 211                 case 'I':
 212                         if (optarg[0] == '/') {
 213                                 fprintf(stderr, "Error: Invalid index page: %s\n",
 214                                                 optarg);
 215                                 exit(1);
 216                         }
 217                         uh_index_add(optarg);
 218                         break;
 219
 220                 case 'S':
 221                         conf.no_symlinks = 1;
 222                         break;
 223
 224                 case 'D':
 225                         conf.no_dirlists = 1;
 226                         break;
 227
 228                 case 'R':
 229                         conf.rfc1918_filter = 1;
 230                         break;
 231
 232                 case 'n':
 233                         conf.max_requests = atoi(optarg);
 234                         break;
 235
 236                 case 't':
 237                         conf.script_timeout = atoi(optarg);
 238                         break;
 239
 240                 case 'T':
 241                         conf.network_timeout = atoi(optarg);
 242                         break;
 243
 244                 case 'A':
 245                         conf.tcp_keepalive = atoi(optarg);
 246                         break;
 247
 248                 case 'f':
 249                         nofork = 1;
 250                         break;
 251
 252                 case 'd':
 253                         port = alloca(strlen(optarg) + 1);
 254                         if (!port)
 255                                 return -1;
 256
 257                         /* "decode" plus to space to retain compat */
 258                         for (opt = 0; optarg[opt]; opt++)
 259                                 if (optarg[opt] == '+')
 260                                         optarg[opt] = ' ';
 261
 262                         /* opt now contains strlen(optarg) -- no need to re-scan */
 263                         if (uh_urldecode(port, opt, optarg, opt) < 0) {
 264                                 fprintf(stderr, "uhttpd: invalid encoding\n");
 265                                 return -1;
 266                         }
 267
 268                         printf("%s", port);
 269                         break;
 270
 271                 /* basic auth realm */
 272                 case 'r':
 273                         conf.realm = optarg;
 274                         break;
 275
 276                 /* md5 crypt */
 277                 case 'm':
 278                         printf("%s\n", crypt(optarg, "$1$"));
 279                         return 0;
 280                         break;
 281
 282                 /* config file */
 283                 case 'c':
 284                         conf.file = optarg;
 285                         break;
 286
 287                 default:
 288                         return usage(argv[0]);
 289                 }
 290         }
 291
 292         uh_config_parse();
 293
 294         if (!bound) {
 295                 fprintf(stderr, "Error: No sockets bound, unable to continue\n");
 296                 return 1;
 297         }
 298
 299         /* fork (if not disabled) */
 300         if (!nofork) {
 301                 switch (fork()) {
 302                 case -1:
 303                         perror("fork()");
 304                         exit(1);
 305
 306                 case 0:
 307                         /* daemon setup */
 308                         if (chdir("/"))
 309                                 perror("chdir()");
 310
 311                         cur_fd = open("/dev/null", O_WRONLY);
 312                         if (cur_fd > 0) {
 313                                 dup2(cur_fd, 0);
 314                                 dup2(cur_fd, 1);
 315                                 dup2(cur_fd, 2);
 316                         }
 317
 318                         break;
 319
 320                 default:
 321                         exit(0);
 322                 }
 323         }
 324
 325         return run_server();
 326 }