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.script_timeout = 60;
 163         conf.network_timeout = 30;
 164         conf.http_keepalive = 0; /* fixme */
 165         conf.max_requests = 3;
 166         conf.realm = "Protected Area";
 167
 168         uh_index_add("index.html");
 169         uh_index_add("index.htm");
 170         uh_index_add("default.html");
 171         uh_index_add("default.htm");
 172 }
 173
 174 int main(int argc, char **argv)
 175 {
 176         bool nofork = false;
 177         char *port;
 178         int opt, ch;
 179         int cur_fd;
 180         int bound = 0;
 181
 182         init_defaults();
 183         signal(SIGPIPE, SIG_IGN);
 184
 185         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) {
 186                 bool tls = false;
 187
 188                 switch(ch) {
 189                 case 's':
 190                         tls = true;
 191                         /* fall through */
 192                 case 'p':
 193                         bound += add_listener_arg(optarg, tls);
 194                         break;
 195
 196                 case 'h':
 197                         if (!realpath(optarg, conf.docroot)) {
 198                                 fprintf(stderr, "Error: Invalid directory %s: %s\n",
 199                                                 optarg, strerror(errno));
 200                                 exit(1);
 201                         }
 202                         break;
 203
 204                 case 'E':
 205                         if (optarg[0] != '/') {
 206                                 fprintf(stderr, "Error: Invalid error handler: %s\n",
 207                                                 optarg);
 208                                 exit(1);
 209                         }
 210                         conf.error_handler = optarg;
 211                         break;
 212
 213                 case 'I':
 214                         if (optarg[0] == '/') {
 215                                 fprintf(stderr, "Error: Invalid index page: %s\n",
 216                                                 optarg);
 217                                 exit(1);
 218                         }
 219                         uh_index_add(optarg);
 220                         break;
 221
 222                 case 'S':
 223                         conf.no_symlinks = 1;
 224                         break;
 225
 226                 case 'D':
 227                         conf.no_dirlists = 1;
 228                         break;
 229
 230                 case 'R':
 231                         conf.rfc1918_filter = 1;
 232                         break;
 233
 234                 case 'n':
 235                         conf.max_requests = atoi(optarg);
 236                         break;
 237
 238                 case 't':
 239                         conf.script_timeout = atoi(optarg);
 240                         break;
 241
 242                 case 'T':
 243                         conf.network_timeout = atoi(optarg);
 244                         break;
 245
 246                 case 'A':
 247                         conf.tcp_keepalive = atoi(optarg);
 248                         break;
 249
 250                 case 'f':
 251                         nofork = 1;
 252                         break;
 253
 254                 case 'd':
 255                         port = alloca(strlen(optarg) + 1);
 256                         if (!port)
 257                                 return -1;
 258
 259                         /* "decode" plus to space to retain compat */
 260                         for (opt = 0; optarg[opt]; opt++)
 261                                 if (optarg[opt] == '+')
 262                                         optarg[opt] = ' ';
 263
 264                         /* opt now contains strlen(optarg) -- no need to re-scan */
 265                         if (uh_urldecode(port, opt, optarg, opt) < 0) {
 266                                 fprintf(stderr, "uhttpd: invalid encoding\n");
 267                                 return -1;
 268                         }
 269
 270                         printf("%s", port);
 271                         break;
 272
 273                 /* basic auth realm */
 274                 case 'r':
 275                         conf.realm = optarg;
 276                         break;
 277
 278                 /* md5 crypt */
 279                 case 'm':
 280                         printf("%s\n", crypt(optarg, "$1$"));
 281                         return 0;
 282                         break;
 283
 284                 /* config file */
 285                 case 'c':
 286                         conf.file = optarg;
 287                         break;
 288
 289                 default:
 290                         return usage(argv[0]);
 291                 }
 292         }
 293
 294         uh_config_parse();
 295
 296         if (!bound) {
 297                 fprintf(stderr, "Error: No sockets bound, unable to continue\n");
 298                 return 1;
 299         }
 300
 301         /* fork (if not disabled) */
 302         if (!nofork) {
 303                 switch (fork()) {
 304                 case -1:
 305                         perror("fork()");
 306                         exit(1);
 307
 308                 case 0:
 309                         /* daemon setup */
 310                         if (chdir("/"))
 311                                 perror("chdir()");
 312
 313                         cur_fd = open("/dev/null", O_WRONLY);
 314                         if (cur_fd > 0) {
 315                                 dup2(cur_fd, 0);
 316                                 dup2(cur_fd, 1);
 317                                 dup2(cur_fd, 2);
 318                         }
 319
 320                         break;
 321
 322                 default:
 323                         exit(0);
 324                 }
 325         }
 326
 327         return run_server();
 328 }