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 void 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         uh_socket_bind(host, port, tls);
 114 }
 115
 116 static int usage(const char *name)
 117 {
 118         fprintf(stderr, "Usage: %s -p <port>\n", name);
 119         return 1;
 120 }
 121
 122 static void init_defaults(void)
 123 {
 124         conf.network_timeout = 30;
 125         conf.http_keepalive = 0; /* fixme */
 126         conf.max_requests = 3;
 127
 128         uh_index_add("index.html");
 129         uh_index_add("index.htm");
 130         uh_index_add("default.html");
 131         uh_index_add("default.htm");
 132 }
 133
 134 int main(int argc, char **argv)
 135 {
 136         bool nofork = false;
 137         char *port;
 138         int opt, ch;
 139         int cur_fd;
 140
 141         init_defaults();
 142         signal(SIGPIPE, SIG_IGN);
 143
 144         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) {
 145                 bool tls = false;
 146
 147                 switch(ch) {
 148                 case 's':
 149                         tls = true;
 150                         /* fall through */
 151                 case 'p':
 152                         add_listener_arg(optarg, tls);
 153                         break;
 154
 155                 case 'h':
 156                         if (!realpath(optarg, conf.docroot)) {
 157                                 fprintf(stderr, "Error: Invalid directory %s: %s\n",
 158                                                 optarg, strerror(errno));
 159                                 exit(1);
 160                         }
 161                         break;
 162
 163                 case 'E':
 164                         if (optarg[0] != '/') {
 165                                 fprintf(stderr, "Error: Invalid error handler: %s\n",
 166                                                 optarg);
 167                                 exit(1);
 168                         }
 169                         conf.error_handler = optarg;
 170                         break;
 171
 172                 case 'I':
 173                         if (optarg[0] == '/') {
 174                                 fprintf(stderr, "Error: Invalid index page: %s\n",
 175                                                 optarg);
 176                                 exit(1);
 177                         }
 178                         uh_index_add(optarg);
 179                         break;
 180
 181                 case 'S':
 182                         conf.no_symlinks = 1;
 183                         break;
 184
 185                 case 'D':
 186                         conf.no_dirlists = 1;
 187                         break;
 188
 189                 case 'R':
 190                         conf.rfc1918_filter = 1;
 191                         break;
 192
 193                 case 'n':
 194                         conf.max_requests = atoi(optarg);
 195                         break;
 196
 197                 case 't':
 198                         conf.script_timeout = atoi(optarg);
 199                         break;
 200
 201                 case 'T':
 202                         conf.network_timeout = atoi(optarg);
 203                         break;
 204
 205                 case 'A':
 206                         conf.tcp_keepalive = atoi(optarg);
 207                         break;
 208
 209                 case 'f':
 210                         nofork = 1;
 211                         break;
 212
 213                 case 'd':
 214                         port = alloca(strlen(optarg) + 1);
 215                         if (!port)
 216                                 return -1;
 217
 218                         /* "decode" plus to space to retain compat */
 219                         for (opt = 0; optarg[opt]; opt++)
 220                                 if (optarg[opt] == '+')
 221                                         optarg[opt] = ' ';
 222
 223                         /* opt now contains strlen(optarg) -- no need to re-scan */
 224                         if (uh_urldecode(port, opt, optarg, opt) < 0) {
 225                                 fprintf(stderr, "uhttpd: invalid encoding\n");
 226                                 return -1;
 227                         }
 228
 229                         printf("%s", port);
 230                         break;
 231
 232                 /* basic auth realm */
 233                 case 'r':
 234                         conf.realm = optarg;
 235                         break;
 236
 237                 /* md5 crypt */
 238                 case 'm':
 239                         printf("%s\n", crypt(optarg, "$1$"));
 240                         return 0;
 241                         break;
 242
 243                 /* config file */
 244                 case 'c':
 245                         conf.file = optarg;
 246                         break;
 247
 248                 default:
 249                         return usage(argv[0]);
 250                 }
 251         }
 252
 253         uh_config_parse();
 254
 255         /* fork (if not disabled) */
 256         if (!nofork) {
 257                 switch (fork()) {
 258                 case -1:
 259                         perror("fork()");
 260                         exit(1);
 261
 262                 case 0:
 263                         /* daemon setup */
 264                         if (chdir("/"))
 265                                 perror("chdir()");
 266
 267                         cur_fd = open("/dev/null", O_WRONLY);
 268                         if (cur_fd > 0) {
 269                                 dup2(cur_fd, 0);
 270                                 dup2(cur_fd, 1);
 271                                 dup2(cur_fd, 2);
 272                         }
 273
 274                         break;
 275
 276                 default:
 277                         exit(0);
 278                 }
 279         }
 280
 281         return run_server();
 282 }