uclient-fetch.c

   1 /*
   2  * uclient - ustream based protocol client library
   3  *
   4  * Copyright (C) 2014 Felix Fietkau <nbd@openwrt.org>
   5  *
   6  * Permission to use, copy, modify, and/or distribute this software for any
   7  * purpose with or without fee is hereby granted, provided that the above
   8  * copyright notice and this permission notice appear in all copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17  */
  18
  19 #define _GNU_SOURCE
  20 #include <unistd.h>
  21 #include <stdio.h>
  22 #include <dlfcn.h>
  23 #include <getopt.h>
  24 #include <fcntl.h>
  25 #include <glob.h>
  26
  27 #include <libubox/blobmsg.h>
  28
  29 #include "uclient.h"
  30 #include "uclient-utils.h"
  31
  32 #ifdef __APPLE__
  33 #define LIB_EXT "dylib"
  34 #else
  35 #define LIB_EXT "so"
  36 #endif
  37
  38 static const char *user_agent = "uclient-fetch";
  39 static const char *post_data;
  40 static struct ustream_ssl_ctx *ssl_ctx;
  41 static const struct ustream_ssl_ops *ssl_ops;
  42 static int quiet = false;
  43 static bool verify = true;
  44 static bool default_certs = false;
  45 static bool no_output;
  46 static const char *output_file;
  47 static int output_fd = -1;
  48 static int error_ret;
  49 static int out_bytes;
  50 static char *username;
  51 static char *password;
  52 static char *auth_str;
  53 static char **urls;
  54 static int n_urls;
  55
  56 static void request_done(struct uclient *cl);
  57
  58 static int open_output_file(const char *path, bool create)
  59 {
  60         char *filename;
  61         int flags = O_WRONLY;
  62         int ret;
  63
  64         if (create)
  65                 flags |= O_CREAT | O_EXCL;
  66
  67         if (output_file) {
  68                 if (!strcmp(output_file, "-"))
  69                         return STDOUT_FILENO;
  70
  71                 if (!quiet)
  72                         fprintf(stderr, "Writing to stdout\n");
  73
  74                 unlink(output_file);
  75                 return open(output_file, flags, 0644);
  76         }
  77
  78         filename = uclient_get_url_filename(path, "index.html");
  79         if (!quiet)
  80                 fprintf(stderr, "Writing to '%s'\n", filename);
  81         ret = open(filename, flags, 0644);
  82         free(filename);
  83
  84         return ret;
  85 }
  86
  87 static void header_done_cb(struct uclient *cl)
  88 {
  89         static int retries;
  90
  91         if (retries < 10 && uclient_http_redirect(cl)) {
  92                 if (!quiet)
  93                         fprintf(stderr, "Redirected to %s on %s\n", cl->url->location, cl->url->host);
  94
  95                 retries++;
  96                 return;
  97         }
  98
  99         retries = 0;
 100         switch (cl->status_code) {
 101         case 204:
 102         case 200:
 103                 if (no_output)
 104                         break;
 105                 output_fd = open_output_file(cl->url->location, true);
 106                 if (output_fd < 0) {
 107                         if (!quiet)
 108                                 perror("Cannot open output file");
 109                         error_ret = 3;
 110                         request_done(cl);
 111                 }
 112                 break;
 113
 114         default:
 115                 if (!quiet)
 116                         fprintf(stderr, "HTTP error %d\n", cl->status_code);
 117                 request_done(cl);
 118                 error_ret = 8;
 119                 break;
 120         }
 121 }
 122
 123 static void read_data_cb(struct uclient *cl)
 124 {
 125         char buf[256];
 126         int len;
 127
 128         if (!no_output && output_fd < 0)
 129                 return;
 130
 131         while (1) {
 132                 len = uclient_read(cl, buf, sizeof(buf));
 133                 if (!len)
 134                         return;
 135
 136                 out_bytes += len;
 137                 if (!no_output)
 138                         write(output_fd, buf, len);
 139         }
 140 }
 141
 142 static void msg_connecting(struct uclient *cl)
 143 {
 144         char addr[INET6_ADDRSTRLEN];
 145         int port;
 146
 147         if (quiet)
 148                 return;
 149
 150         uclient_get_addr(addr, &port, &cl->remote_addr);
 151         fprintf(stderr, "Connecting to %s:%d\n", addr, port);
 152 }
 153
 154 static int init_request(struct uclient *cl)
 155 {
 156         int rc;
 157
 158         out_bytes = 0;
 159         uclient_http_set_ssl_ctx(cl, ssl_ops, ssl_ctx, verify);
 160
 161         rc = uclient_connect(cl);
 162         if (rc)
 163                 return rc;
 164
 165         msg_connecting(cl);
 166
 167         rc = uclient_http_set_request_type(cl, post_data ? "POST" : "GET");
 168         if (rc)
 169                 return rc;
 170
 171         uclient_http_reset_headers(cl);
 172         uclient_http_set_header(cl, "User-Agent", user_agent);
 173
 174         if (post_data) {
 175                 uclient_http_set_header(cl, "Content-Type", "application/x-www-form-urlencoded");
 176                 uclient_write(cl, post_data, strlen(post_data));
 177         }
 178
 179         rc = uclient_request(cl);
 180         if (rc)
 181                 return rc;
 182
 183         return 0;
 184 }
 185
 186 static void request_done(struct uclient *cl)
 187 {
 188         if (n_urls) {
 189                 uclient_set_url(cl, *urls, auth_str);
 190                 n_urls--;
 191                 error_ret = init_request(cl);
 192                 if (error_ret == 0)
 193                         return;
 194         }
 195
 196         if (output_fd >= 0 && !output_file) {
 197                 close(output_fd);
 198                 output_fd = -1;
 199         }
 200         uclient_disconnect(cl);
 201         uloop_end();
 202 }
 203
 204
 205 static void eof_cb(struct uclient *cl)
 206 {
 207         if (!cl->data_eof) {
 208                 if (!quiet)
 209                         fprintf(stderr, "Connection reset prematurely\n");
 210                 error_ret = 4;
 211         } else if (!quiet) {
 212                 fprintf(stderr, "Download completed (%d bytes)\n", out_bytes);
 213         }
 214         request_done(cl);
 215 }
 216
 217 static void handle_uclient_error(struct uclient *cl, int code)
 218 {
 219         const char *type = "Unknown error";
 220         bool ignore = false;
 221
 222         switch(code) {
 223         case UCLIENT_ERROR_CONNECT:
 224                 type = "Connection failed";
 225                 error_ret = 4;
 226                 break;
 227         case UCLIENT_ERROR_TIMEDOUT:
 228                 type = "Connection timed out";
 229                 error_ret = 4;
 230                 break;
 231         case UCLIENT_ERROR_SSL_INVALID_CERT:
 232                 type = "Invalid SSL certificate";
 233                 ignore = !verify;
 234                 error_ret = 5;
 235                 break;
 236         case UCLIENT_ERROR_SSL_CN_MISMATCH:
 237                 type = "Server hostname does not match SSL certificate";
 238                 ignore = !verify;
 239                 error_ret = 5;
 240                 break;
 241         default:
 242                 error_ret = 1;
 243                 break;
 244         }
 245
 246         if (!quiet)
 247                 fprintf(stderr, "Connection error: %s%s\n", type, ignore ? " (ignored)" : "");
 248
 249         if (ignore)
 250                 error_ret = 0;
 251         else
 252                 request_done(cl);
 253 }
 254
 255 static const struct uclient_cb cb = {
 256         .header_done = header_done_cb,
 257         .data_read = read_data_cb,
 258         .data_eof = eof_cb,
 259         .error = handle_uclient_error,
 260 };
 261
 262 static int usage(const char *progname)
 263 {
 264         fprintf(stderr,
 265                 "Usage: %s [options] <URL>\n"
 266                 "Options:\n"
 267                 "       -q:                             Turn off status messages\n"
 268                 "       -O <file>:                      Redirect output to file (use \"-\" for stdout)\n"
 269                 "       --user=<user>                   HTTP authentication username\n"
 270                 "       --password=<password>           HTTP authentication password\n"
 271                 "       --user-agent|-U <str>           Set HTTP user agent\n"
 272                 "       --post-data=STRING              use the POST method; send STRING as the data\n"
 273                 "       --spider|-s                     Spider mode - only check file existence\n"
 274                 "\n"
 275                 "HTTPS options:\n"
 276                 "       --ca-certificate=<cert>:        Load CA certificates from file <cert>\n"
 277                 "       --no-check-certificate:         don't validate the server's certificate\n"
 278                 "\n", progname);
 279         return 1;
 280 }
 281
 282 static void init_ca_cert(void)
 283 {
 284         glob_t gl;
 285         int i;
 286
 287         glob("/etc/ssl/certs/*.crt", 0, NULL, &gl);
 288         for (i = 0; i < gl.gl_pathc; i++)
 289                 ssl_ops->context_add_ca_crt_file(ssl_ctx, gl.gl_pathv[i]);
 290 }
 291
 292 static void init_ustream_ssl(void)
 293 {
 294         void *dlh;
 295
 296         dlh = dlopen("libustream-ssl." LIB_EXT, RTLD_LAZY | RTLD_LOCAL);
 297         if (!dlh)
 298                 return;
 299
 300         ssl_ops = dlsym(dlh, "ustream_ssl_ops");
 301         if (!ssl_ops)
 302                 return;
 303
 304         ssl_ctx = ssl_ops->context_new(false);
 305 }
 306
 307 static int no_ssl(const char *progname)
 308 {
 309         fprintf(stderr, "%s: SSL support not available, please install ustream-ssl\n", progname);
 310         return 1;
 311 }
 312
 313 enum {
 314         L_NO_CHECK_CERTIFICATE,
 315         L_CA_CERTIFICATE,
 316         L_USER,
 317         L_PASSWORD,
 318         L_USER_AGENT,
 319         L_POST_DATA,
 320         L_SPIDER,
 321 };
 322
 323 static const struct option longopts[] = {
 324         [L_NO_CHECK_CERTIFICATE] = { "no-check-certificate", no_argument },
 325         [L_CA_CERTIFICATE] = { "ca-certificate", required_argument },
 326         [L_USER] = { "user", required_argument },
 327         [L_PASSWORD] = { "password", required_argument },
 328         [L_USER_AGENT] = { "user-agent", required_argument },
 329         [L_POST_DATA] = { "post-data", required_argument },
 330         [L_SPIDER] = { "spider", no_argument },
 331         {}
 332 };
 333
 334
 335
 336 int main(int argc, char **argv)
 337 {
 338         const char *progname = argv[0];
 339         struct uclient *cl;
 340         int longopt_idx = 0;
 341         bool has_cert = false;
 342         int i, ch;
 343         int rc;
 344
 345         init_ustream_ssl();
 346
 347         while ((ch = getopt_long(argc, argv, "O:qsU:", longopts, &longopt_idx)) != -1) {
 348                 switch(ch) {
 349                 case 0:
 350                         switch (longopt_idx) {
 351                         case L_NO_CHECK_CERTIFICATE:
 352                                 verify = false;
 353                                 break;
 354                         case L_CA_CERTIFICATE:
 355                                 has_cert = true;
 356                                 if (ssl_ctx)
 357                                         ssl_ops->context_add_ca_crt_file(ssl_ctx, optarg);
 358                                 break;
 359                         case L_USER:
 360                                 if (!strlen(optarg))
 361                                         break;
 362                                 username = strdup(optarg);
 363                                 memset(optarg, '*', strlen(optarg));
 364                                 break;
 365                         case L_PASSWORD:
 366                                 if (!strlen(optarg))
 367                                         break;
 368                                 password = strdup(optarg);
 369                                 memset(optarg, '*', strlen(optarg));
 370                                 break;
 371                         case L_USER_AGENT:
 372                                 user_agent = optarg;
 373                                 break;
 374                         case L_POST_DATA:
 375                                 post_data = optarg;
 376                                 break;
 377                         case L_SPIDER:
 378                                 no_output = true;
 379                                 break;
 380                         default:
 381                                 return usage(progname);
 382                         }
 383                         break;
 384                 case 'U':
 385                         user_agent = optarg;
 386                         break;
 387                 case 'O':
 388                         output_file = optarg;
 389                         break;
 390                 case 'q':
 391                         quiet = true;
 392                         break;
 393                 case 's':
 394                         no_output = true;
 395                         break;
 396                 default:
 397                         return usage(progname);
 398                 }
 399         }
 400
 401         argv += optind;
 402         argc -= optind;
 403
 404         if (verify && !has_cert)
 405                 default_certs = true;
 406
 407         if (argc < 1)
 408                 return usage(progname);
 409
 410         if (!ssl_ctx) {
 411                 for (i = 0; i < argc; i++) {
 412                         if (!strncmp(argv[i], "https", 5))
 413                                 return no_ssl(progname);
 414                 }
 415         }
 416
 417         urls = argv + 1;
 418         n_urls = argc - 1;
 419
 420         uloop_init();
 421
 422         if (username) {
 423                 if (password)
 424                         asprintf(&auth_str, "%s:%s", username, password);
 425                 else
 426                         auth_str = username;
 427         }
 428
 429         if (!quiet)
 430                 fprintf(stderr, "Downloading '%s'\n", argv[0]);
 431
 432         cl = uclient_new(argv[0], auth_str, &cb);
 433         if (!cl) {
 434                 fprintf(stderr, "Failed to allocate uclient context\n");
 435                 return 1;
 436         }
 437
 438         if (ssl_ctx && default_certs)
 439                 init_ca_cert();
 440
 441         rc = init_request(cl);
 442         if (!rc) {
 443                 /* no error received, we can enter main loop */
 444                 uloop_run();
 445         } else {
 446                 fprintf(stderr, "Failed to establish connection\n");
 447                 error_ret = 4;
 448         }
 449
 450         uloop_done();
 451
 452         uclient_free(cl);
 453
 454         if (output_fd >= 0 && output_fd != STDOUT_FILENO)
 455                 close(output_fd);
 456
 457         if (ssl_ctx)
 458                 ssl_ops->context_free(ssl_ctx);
 459
 460         return error_ret;
 461 }