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         conf.cgi_prefix = "/cgi-bin";
 168
 169         uh_index_add("index.html");
 170         uh_index_add("index.htm");
 171         uh_index_add("default.html");
 172         uh_index_add("default.htm");
 173 }
 174
 175 int main(int argc, char **argv)
 176 {
 177         bool nofork = false;
 178         char *port;
 179         int opt, ch;
 180         int cur_fd;
 181         int bound = 0;
 182
 183         init_defaults();
 184         signal(SIGPIPE, SIG_IGN);
 185
 186         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) {
 187                 bool tls = false;
 188
 189                 switch(ch) {
 190                 case 's':
 191                         tls = true;
 192                         /* fall through */
 193                 case 'p':
 194                         bound += add_listener_arg(optarg, tls);
 195                         break;
 196
 197                 case 'h':
 198                         if (!realpath(optarg, conf.docroot)) {
 199                                 fprintf(stderr, "Error: Invalid directory %s: %s\n",
 200                                                 optarg, strerror(errno));
 201                                 exit(1);
 202                         }
 203                         break;
 204
 205                 case 'E':
 206                         if (optarg[0] != '/') {
 207                                 fprintf(stderr, "Error: Invalid error handler: %s\n",
 208                                                 optarg);
 209                                 exit(1);
 210                         }
 211                         conf.error_handler = optarg;
 212                         break;
 213
 214                 case 'I':
 215                         if (optarg[0] == '/') {
 216                                 fprintf(stderr, "Error: Invalid index page: %s\n",
 217                                                 optarg);
 218                                 exit(1);
 219                         }
 220                         uh_index_add(optarg);
 221                         break;
 222
 223                 case 'S':
 224                         conf.no_symlinks = 1;
 225                         break;
 226
 227                 case 'D':
 228                         conf.no_dirlists = 1;
 229                         break;
 230
 231                 case 'R':
 232                         conf.rfc1918_filter = 1;
 233                         break;
 234
 235                 case 'n':
 236                         conf.max_requests = atoi(optarg);
 237                         break;
 238
 239                 case 't':
 240                         conf.script_timeout = atoi(optarg);
 241                         break;
 242
 243                 case 'T':
 244                         conf.network_timeout = atoi(optarg);
 245                         break;
 246
 247                 case 'A':
 248                         conf.tcp_keepalive = atoi(optarg);
 249                         break;
 250
 251                 case 'f':
 252                         nofork = 1;
 253                         break;
 254
 255                 case 'd':
 256                         port = alloca(strlen(optarg) + 1);
 257                         if (!port)
 258                                 return -1;
 259
 260                         /* "decode" plus to space to retain compat */
 261                         for (opt = 0; optarg[opt]; opt++)
 262                                 if (optarg[opt] == '+')
 263                                         optarg[opt] = ' ';
 264
 265                         /* opt now contains strlen(optarg) -- no need to re-scan */
 266                         if (uh_urldecode(port, opt, optarg, opt) < 0) {
 267                                 fprintf(stderr, "uhttpd: invalid encoding\n");
 268                                 return -1;
 269                         }
 270
 271                         printf("%s", port);
 272                         break;
 273
 274                 /* basic auth realm */
 275                 case 'r':
 276                         conf.realm = optarg;
 277                         break;
 278
 279                 /* md5 crypt */
 280                 case 'm':
 281                         printf("%s\n", crypt(optarg, "$1$"));
 282                         return 0;
 283                         break;
 284
 285                 /* config file */
 286                 case 'c':
 287                         conf.file = optarg;
 288                         break;
 289
 290                 default:
 291                         return usage(argv[0]);
 292                 }
 293         }
 294
 295         uh_config_parse();
 296
 297         if (!bound) {
 298                 fprintf(stderr, "Error: No sockets bound, unable to continue\n");
 299                 return 1;
 300         }
 301
 302         /* fork (if not disabled) */
 303         if (!nofork) {
 304                 switch (fork()) {
 305                 case -1:
 306                         perror("fork()");
 307                         exit(1);
 308
 309                 case 0:
 310                         /* daemon setup */
 311                         if (chdir("/"))
 312                                 perror("chdir()");
 313
 314                         cur_fd = open("/dev/null", O_WRONLY);
 315                         if (cur_fd > 0) {
 316                                 dup2(cur_fd, 0);
 317                                 dup2(cur_fd, 1);
 318                                 dup2(cur_fd, 2);
 319                         }
 320
 321                         break;
 322
 323                 default:
 324                         exit(0);
 325                 }
 326         }
 327
 328         return run_server();
 329 }