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 static int timeout;
  56
  57 static void request_done(struct uclient *cl);
  58
  59 static int open_output_file(const char *path, bool create)
  60 {
  61         char *filename = NULL;
  62         int flags = O_WRONLY;
  63         int ret;
  64
  65         if (create)
  66                 flags |= O_CREAT | O_EXCL;
  67
  68         if (output_file) {
  69                 if (!strcmp(output_file, "-")) {
  70                         if (!quiet)
  71                                 fprintf(stderr, "Writing to stdout\n");
  72
  73                         return STDOUT_FILENO;
  74                 }
  75         } else {
  76                 filename = uclient_get_url_filename(path, "index.html");
  77                 output_file = filename;
  78         }
  79
  80         if (!quiet)
  81                 fprintf(stderr, "Writing to '%s'\n", output_file);
  82         ret = open(output_file, flags, 0644);
  83         free(filename);
  84
  85         return ret;
  86 }
  87
  88 static void header_done_cb(struct uclient *cl)
  89 {
  90         static int retries;
  91
  92         if (retries < 10 && uclient_http_redirect(cl)) {
  93                 if (!quiet)
  94                         fprintf(stderr, "Redirected to %s on %s\n", cl->url->location, cl->url->host);
  95
  96                 retries++;
  97                 return;
  98         }
  99
 100         retries = 0;
 101         switch (cl->status_code) {
 102         case 204:
 103         case 200:
 104                 if (no_output)
 105                         break;
 106                 output_fd = open_output_file(cl->url->location, true);
 107                 if (output_fd < 0) {
 108                         if (!quiet)
 109                                 perror("Cannot open output file");
 110                         error_ret = 3;
 111                         request_done(cl);
 112                 }
 113                 break;
 114
 115         default:
 116                 if (!quiet)
 117                         fprintf(stderr, "HTTP error %d\n", cl->status_code);
 118                 request_done(cl);
 119                 error_ret = 8;
 120                 break;
 121         }
 122 }
 123
 124 static void read_data_cb(struct uclient *cl)
 125 {
 126         char buf[256];
 127         int len;
 128
 129         if (!no_output && output_fd < 0)
 130                 return;
 131
 132         while (1) {
 133                 len = uclient_read(cl, buf, sizeof(buf));
 134                 if (!len)
 135                         return;
 136
 137                 out_bytes += len;
 138                 if (!no_output)
 139                         write(output_fd, buf, len);
 140         }
 141 }
 142
 143 static void msg_connecting(struct uclient *cl)
 144 {
 145         char addr[INET6_ADDRSTRLEN];
 146         int port;
 147
 148         if (quiet)
 149                 return;
 150
 151         uclient_get_addr(addr, &port, &cl->remote_addr);
 152         fprintf(stderr, "Connecting to %s:%d\n", addr, port);
 153 }
 154
 155 static int init_request(struct uclient *cl)
 156 {
 157         int rc;
 158
 159         out_bytes = 0;
 160         uclient_http_set_ssl_ctx(cl, ssl_ops, ssl_ctx, verify);
 161
 162         if (timeout)
 163                 cl->timeout_msecs = timeout * 1000;
 164
 165         rc = uclient_connect(cl);
 166         if (rc)
 167                 return rc;
 168
 169         msg_connecting(cl);
 170
 171         rc = uclient_http_set_request_type(cl, post_data ? "POST" : "GET");
 172         if (rc)
 173                 return rc;
 174
 175         uclient_http_reset_headers(cl);
 176         uclient_http_set_header(cl, "User-Agent", user_agent);
 177
 178         if (post_data) {
 179                 uclient_http_set_header(cl, "Content-Type", "application/x-www-form-urlencoded");
 180                 uclient_write(cl, post_data, strlen(post_data));
 181         }
 182
 183         rc = uclient_request(cl);
 184         if (rc)
 185                 return rc;
 186
 187         return 0;
 188 }
 189
 190 static void request_done(struct uclient *cl)
 191 {
 192         if (n_urls) {
 193                 uclient_set_url(cl, *urls, auth_str);
 194                 n_urls--;
 195                 error_ret = init_request(cl);
 196                 if (error_ret == 0)
 197                         return;
 198         }
 199
 200         if (output_fd >= 0 && !output_file) {
 201                 close(output_fd);
 202                 output_fd = -1;
 203         }
 204         uclient_disconnect(cl);
 205         uloop_end();
 206 }
 207
 208
 209 static void eof_cb(struct uclient *cl)
 210 {
 211         if (!cl->data_eof) {
 212                 if (!quiet)
 213                         fprintf(stderr, "Connection reset prematurely\n");
 214                 error_ret = 4;
 215         } else if (!quiet) {
 216                 fprintf(stderr, "Download completed (%d bytes)\n", out_bytes);
 217         }
 218         request_done(cl);
 219 }
 220
 221 static void handle_uclient_error(struct uclient *cl, int code)
 222 {
 223         const char *type = "Unknown error";
 224         bool ignore = false;
 225
 226         switch(code) {
 227         case UCLIENT_ERROR_CONNECT:
 228                 type = "Connection failed";
 229                 error_ret = 4;
 230                 break;
 231         case UCLIENT_ERROR_TIMEDOUT:
 232                 type = "Connection timed out";
 233                 error_ret = 4;
 234                 break;
 235         case UCLIENT_ERROR_SSL_INVALID_CERT:
 236                 type = "Invalid SSL certificate";
 237                 ignore = !verify;
 238                 error_ret = 5;
 239                 break;
 240         case UCLIENT_ERROR_SSL_CN_MISMATCH:
 241                 type = "Server hostname does not match SSL certificate";
 242                 ignore = !verify;
 243                 error_ret = 5;
 244                 break;
 245         default:
 246                 error_ret = 1;
 247                 break;
 248         }
 249
 250         if (!quiet)
 251                 fprintf(stderr, "Connection error: %s%s\n", type, ignore ? " (ignored)" : "");
 252
 253         if (ignore)
 254                 error_ret = 0;
 255         else
 256                 request_done(cl);
 257 }
 258
 259 static const struct uclient_cb cb = {
 260         .header_done = header_done_cb,
 261         .data_read = read_data_cb,
 262         .data_eof = eof_cb,
 263         .error = handle_uclient_error,
 264 };
 265
 266 static int usage(const char *progname)
 267 {
 268         fprintf(stderr,
 269                 "Usage: %s [options] <URL>\n"
 270                 "Options:\n"
 271                 "       -q:                             Turn off status messages\n"
 272                 "       -O <file>:                      Redirect output to file (use \"-\" for stdout)\n"
 273                 "       --user=<user>                   HTTP authentication username\n"
 274                 "       --password=<password>           HTTP authentication password\n"
 275                 "       --user-agent|-U <str>           Set HTTP user agent\n"
 276                 "       --post-data=STRING              use the POST method; send STRING as the data\n"
 277                 "       --spider|-s                     Spider mode - only check file existence\n"
 278                 "       --timeout=N|-T N                Set connect/request timeout to N seconds\n"
 279                 "\n"
 280                 "HTTPS options:\n"
 281                 "       --ca-certificate=<cert>:        Load CA certificates from file <cert>\n"
 282                 "       --no-check-certificate:         don't validate the server's certificate\n"
 283                 "\n", progname);
 284         return 1;
 285 }
 286
 287 static void init_ca_cert(void)
 288 {
 289         glob_t gl;
 290         int i;
 291
 292         glob("/etc/ssl/certs/*.crt", 0, NULL, &gl);
 293         for (i = 0; i < gl.gl_pathc; i++)
 294                 ssl_ops->context_add_ca_crt_file(ssl_ctx, gl.gl_pathv[i]);
 295 }
 296
 297 static void init_ustream_ssl(void)
 298 {
 299         void *dlh;
 300
 301         dlh = dlopen("libustream-ssl." LIB_EXT, RTLD_LAZY | RTLD_LOCAL);
 302         if (!dlh)
 303                 return;
 304
 305         ssl_ops = dlsym(dlh, "ustream_ssl_ops");
 306         if (!ssl_ops)
 307                 return;
 308
 309         ssl_ctx = ssl_ops->context_new(false);
 310 }
 311
 312 static int no_ssl(const char *progname)
 313 {
 314         fprintf(stderr, "%s: SSL support not available, please install ustream-ssl\n", progname);
 315         return 1;
 316 }
 317
 318 enum {
 319         L_NO_CHECK_CERTIFICATE,
 320         L_CA_CERTIFICATE,
 321         L_USER,
 322         L_PASSWORD,
 323         L_USER_AGENT,
 324         L_POST_DATA,
 325         L_SPIDER,
 326         L_TIMEOUT,
 327 };
 328
 329 static const struct option longopts[] = {
 330         [L_NO_CHECK_CERTIFICATE] = { "no-check-certificate", no_argument },
 331         [L_CA_CERTIFICATE] = { "ca-certificate", required_argument },
 332         [L_USER] = { "user", required_argument },
 333         [L_PASSWORD] = { "password", required_argument },
 334         [L_USER_AGENT] = { "user-agent", required_argument },
 335         [L_POST_DATA] = { "post-data", required_argument },
 336         [L_SPIDER] = { "spider", no_argument },
 337         [L_TIMEOUT] = { "timeout", required_argument },
 338         {}
 339 };
 340
 341
 342
 343 int main(int argc, char **argv)
 344 {
 345         const char *progname = argv[0];
 346         struct uclient *cl;
 347         int longopt_idx = 0;
 348         bool has_cert = false;
 349         int i, ch;
 350         int rc;
 351
 352         init_ustream_ssl();
 353
 354         while ((ch = getopt_long(argc, argv, "O:qsU:", longopts, &longopt_idx)) != -1) {
 355                 switch(ch) {
 356                 case 0:
 357                         switch (longopt_idx) {
 358                         case L_NO_CHECK_CERTIFICATE:
 359                                 verify = false;
 360                                 break;
 361                         case L_CA_CERTIFICATE:
 362                                 has_cert = true;
 363                                 if (ssl_ctx)
 364                                         ssl_ops->context_add_ca_crt_file(ssl_ctx, optarg);
 365                                 break;
 366                         case L_USER:
 367                                 if (!strlen(optarg))
 368                                         break;
 369                                 username = strdup(optarg);
 370                                 memset(optarg, '*', strlen(optarg));
 371                                 break;
 372                         case L_PASSWORD:
 373                                 if (!strlen(optarg))
 374                                         break;
 375                                 password = strdup(optarg);
 376                                 memset(optarg, '*', strlen(optarg));
 377                                 break;
 378                         case L_USER_AGENT:
 379                                 user_agent = optarg;
 380                                 break;
 381                         case L_POST_DATA:
 382                                 post_data = optarg;
 383                                 break;
 384                         case L_SPIDER:
 385                                 no_output = true;
 386                                 break;
 387                         case L_TIMEOUT:
 388                                 timeout = atoi(optarg);
 389                                 break;
 390                         default:
 391                                 return usage(progname);
 392                         }
 393                         break;
 394                 case 'U':
 395                         user_agent = optarg;
 396                         break;
 397                 case 'O':
 398                         output_file = optarg;
 399                         break;
 400                 case 'q':
 401                         quiet = true;
 402                         break;
 403                 case 's':
 404                         no_output = true;
 405                         break;
 406                 case 'T':
 407                         timeout = atoi(optarg);
 408                         break;
 409                 default:
 410                         return usage(progname);
 411                 }
 412         }
 413
 414         argv += optind;
 415         argc -= optind;
 416
 417         if (verify && !has_cert)
 418                 default_certs = true;
 419
 420         if (argc < 1)
 421                 return usage(progname);
 422
 423         if (!ssl_ctx) {
 424                 for (i = 0; i < argc; i++) {
 425                         if (!strncmp(argv[i], "https", 5))
 426                                 return no_ssl(progname);
 427                 }
 428         }
 429
 430         urls = argv + 1;
 431         n_urls = argc - 1;
 432
 433         uloop_init();
 434
 435         if (username) {
 436                 if (password)
 437                         asprintf(&auth_str, "%s:%s", username, password);
 438                 else
 439                         auth_str = username;
 440         }
 441
 442         if (!quiet)
 443                 fprintf(stderr, "Downloading '%s'\n", argv[0]);
 444
 445         cl = uclient_new(argv[0], auth_str, &cb);
 446         if (!cl) {
 447                 fprintf(stderr, "Failed to allocate uclient context\n");
 448                 return 1;
 449         }
 450
 451         if (ssl_ctx && default_certs)
 452                 init_ca_cert();
 453
 454         rc = init_request(cl);
 455         if (!rc) {
 456                 /* no error received, we can enter main loop */
 457                 uloop_run();
 458         } else {
 459                 fprintf(stderr, "Failed to establish connection\n");
 460                 error_ret = 4;
 461         }
 462
 463         uloop_done();
 464
 465         uclient_free(cl);
 466
 467         if (output_fd >= 0 && output_fd != STDOUT_FILENO)
 468                 close(output_fd);
 469
 470         if (ssl_ctx)
 471                 ssl_ops->context_free(ssl_ctx);
 472
 473         return error_ret;
 474 }