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
  26 #include <libubox/blobmsg.h>
  27
  28 #include "uclient.h"
  29 #include "uclient-utils.h"
  30
  31 #ifdef __APPLE__
  32 #define LIB_EXT "dylib"
  33 #else
  34 #define LIB_EXT "so"
  35 #endif
  36
  37 static struct ustream_ssl_ctx *ssl_ctx;
  38 static const struct ustream_ssl_ops *ssl_ops;
  39 static int quiet = false;
  40 static bool verify = true;
  41 static const char *output_file;
  42 static int output_fd = -1;
  43 static int error_ret;
  44 static int out_bytes;
  45 static char *username;
  46 static char *password;
  47 static char *auth_str;
  48
  49 static int open_output_file(const char *path, bool create)
  50 {
  51         char *filename;
  52         int flags = O_WRONLY;
  53         int ret;
  54
  55         if (create)
  56                 flags |= O_CREAT | O_EXCL;
  57
  58         if (output_file) {
  59                 if (!strcmp(output_file, "-"))
  60                         return STDOUT_FILENO;
  61
  62                 if (!quiet)
  63                         fprintf(stderr, "Writing to stdout\n");
  64
  65                 unlink(output_file);
  66                 return open(output_file, flags, 0644);
  67         }
  68
  69         filename = uclient_get_url_filename(path, "index.html");
  70         if (!quiet)
  71                 fprintf(stderr, "Writing to '%s'\n", filename);
  72         ret = open(filename, flags, 0644);
  73         free(filename);
  74
  75         return ret;
  76 }
  77
  78 static void request_done(struct uclient *cl)
  79 {
  80         if (output_fd >= 0 && !output_file) {
  81                 close(output_fd);
  82                 output_fd = -1;
  83         }
  84         uclient_disconnect(cl);
  85         uloop_end();
  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                 output_fd = open_output_file(cl->url->location, true);
 105                 if (output_fd < 0) {
 106                         if (!quiet)
 107                                 perror("Cannot open output file");
 108                         error_ret = 3;
 109                         request_done(cl);
 110                 }
 111                 break;
 112
 113         default:
 114                 if (!quiet)
 115                         fprintf(stderr, "HTTP error %d\n", cl->status_code);
 116                 request_done(cl);
 117                 error_ret = 8;
 118                 break;
 119         }
 120 }
 121
 122 static void read_data_cb(struct uclient *cl)
 123 {
 124         char buf[256];
 125         int len;
 126
 127         if (output_fd < 0)
 128                 return;
 129
 130         while (1) {
 131                 len = uclient_read(cl, buf, sizeof(buf));
 132                 if (!len)
 133                         return;
 134
 135                 out_bytes += len;
 136                 write(output_fd, buf, len);
 137         }
 138 }
 139
 140 static void msg_connecting(struct uclient *cl)
 141 {
 142         char addr[INET6_ADDRSTRLEN];
 143         int port;
 144
 145         if (quiet)
 146                 return;
 147
 148         uclient_get_addr(addr, &port, &cl->remote_addr);
 149         fprintf(stderr, "Connecting to %s:%d\n", addr, port);
 150 }
 151
 152 static int init_request(struct uclient *cl)
 153 {
 154         int rc;
 155
 156         out_bytes = 0;
 157
 158         rc = uclient_connect(cl);
 159         if (rc)
 160                 return rc;
 161
 162         msg_connecting(cl);
 163
 164         rc = uclient_http_set_request_type(cl, "GET");
 165         if (rc)
 166                 return rc;
 167
 168         rc = uclient_request(cl);
 169         if (rc)
 170                 return rc;
 171
 172         return 0;
 173 }
 174
 175 static void eof_cb(struct uclient *cl)
 176 {
 177         if (!cl->data_eof) {
 178                 if (!quiet)
 179                         fprintf(stderr, "Connection reset prematurely\n");
 180                 error_ret = 4;
 181         } else if (!quiet) {
 182                 fprintf(stderr, "Download completed (%d bytes)\n", out_bytes);
 183         }
 184         request_done(cl);
 185 }
 186
 187 static void handle_uclient_error(struct uclient *cl, int code)
 188 {
 189         const char *type = "Unknown error";
 190         bool ignore = false;
 191
 192         switch(code) {
 193         case UCLIENT_ERROR_CONNECT:
 194                 type = "Connection failed";
 195                 error_ret = 4;
 196                 break;
 197         case UCLIENT_ERROR_SSL_INVALID_CERT:
 198                 type = "Invalid SSL certificate";
 199                 ignore = !verify;
 200                 error_ret = 5;
 201                 break;
 202         case UCLIENT_ERROR_SSL_CN_MISMATCH:
 203                 type = "Server hostname does not match SSL certificate";
 204                 ignore = !verify;
 205                 error_ret = 5;
 206                 break;
 207         default:
 208                 error_ret = 1;
 209                 break;
 210         }
 211
 212         if (!quiet)
 213                 fprintf(stderr, "Connection error: %s%s\n", type, ignore ? " (ignored)" : "");
 214
 215         if (ignore)
 216                 error_ret = 0;
 217         else
 218                 request_done(cl);
 219 }
 220
 221 static const struct uclient_cb cb = {
 222         .header_done = header_done_cb,
 223         .data_read = read_data_cb,
 224         .data_eof = eof_cb,
 225         .error = handle_uclient_error,
 226 };
 227
 228 static int usage(const char *progname)
 229 {
 230         fprintf(stderr,
 231                 "Usage: %s [options] <URL>\n"
 232                 "Options:\n"
 233                 "       -q:                             Turn off status messages\n"
 234                 "       -O <file>:                      Redirect output to file (use \"-\" for stdout)\n"
 235                 "\n"
 236                 "HTTPS options:\n"
 237                 "       --ca-certificate=<cert>:        Load CA certificates from file <cert>\n"
 238                 "       --no-check-certificate:         don't validate the server's certificate\n"
 239                 "\n", progname);
 240         return 1;
 241 }
 242
 243
 244 static void init_ustream_ssl(void)
 245 {
 246         void *dlh;
 247
 248         dlh = dlopen("libustream-ssl." LIB_EXT, RTLD_LAZY | RTLD_LOCAL);
 249         if (!dlh)
 250                 return;
 251
 252         ssl_ops = dlsym(dlh, "ustream_ssl_ops");
 253         if (!ssl_ops)
 254                 return;
 255
 256         ssl_ctx = ssl_ops->context_new(false);
 257 }
 258
 259 static int no_ssl(const char *progname)
 260 {
 261         fprintf(stderr, "%s: SSL support not available, please install ustream-ssl\n", progname);
 262         return 1;
 263 }
 264
 265 enum {
 266         L_NO_CHECK_CERTIFICATE,
 267         L_CA_CERTIFICATE,
 268         L_USER,
 269         L_PASSWORD,
 270 };
 271
 272 static const struct option longopts[] = {
 273         [L_NO_CHECK_CERTIFICATE] = { "no-check-certificate", no_argument },
 274         [L_CA_CERTIFICATE] = { "ca-certificate", required_argument },
 275         [L_USER] = { "user", required_argument },
 276         [L_PASSWORD] = { "password", required_argument },
 277         {}
 278 };
 279
 280 int main(int argc, char **argv)
 281 {
 282         const char *progname = argv[0];
 283         struct uclient *cl;
 284         int ch;
 285         int longopt_idx = 0;
 286         int rc;
 287
 288         init_ustream_ssl();
 289
 290         while ((ch = getopt_long(argc, argv, "qO:", longopts, &longopt_idx)) != -1) {
 291                 switch(ch) {
 292                 case 0:
 293                         switch (longopt_idx) {
 294                         case L_NO_CHECK_CERTIFICATE:
 295                                 verify = false;
 296                                 break;
 297                         case L_CA_CERTIFICATE:
 298                                 if (ssl_ctx)
 299                                         ssl_ops->context_add_ca_crt_file(ssl_ctx, optarg);
 300                                 break;
 301                         case L_USER:
 302                                 if (!strlen(optarg))
 303                                         break;
 304                                 username = strdup(optarg);
 305                                 memset(optarg, '*', strlen(optarg));
 306                                 break;
 307                         case L_PASSWORD:
 308                                 if (!strlen(optarg))
 309                                         break;
 310                                 password = strdup(optarg);
 311                                 memset(optarg, '*', strlen(optarg));
 312                                 break;
 313                         default:
 314                                 return usage(progname);
 315                         }
 316                         break;
 317                 case 'O':
 318                         output_file = optarg;
 319                         break;
 320                 case 'q':
 321                         quiet = true;
 322                         break;
 323                 default:
 324                         return usage(progname);
 325                 }
 326         }
 327
 328         argv += optind;
 329         argc -= optind;
 330
 331         if (argc != 1)
 332                 return usage(progname);
 333
 334         if (!strncmp(argv[0], "https", 5) && !ssl_ctx)
 335                 return no_ssl(progname);
 336
 337         uloop_init();
 338
 339         if (username) {
 340                 if (password)
 341                         asprintf(&auth_str, "%s:%s", username, password);
 342                 else
 343                         auth_str = username;
 344         }
 345
 346         if (!quiet)
 347                 fprintf(stderr, "Downloading '%s'\n", argv[0]);
 348
 349         cl = uclient_new(argv[0], auth_str, &cb);
 350         if (!cl) {
 351                 fprintf(stderr, "Failed to allocate uclient context\n");
 352                 return 1;
 353         }
 354
 355         if (ssl_ctx)
 356                 uclient_http_set_ssl_ctx(cl, ssl_ops, ssl_ctx, verify);
 357
 358         rc = init_request(cl);
 359         if (!rc) {
 360                 /* no error received, we can enter main loop */
 361                 uloop_run();
 362         } else {
 363                 fprintf(stderr, "Failed to establish connection\n");
 364                 error_ret = 4;
 365         }
 366
 367         uloop_done();
 368
 369         uclient_free(cl);
 370
 371         if (output_fd >= 0 && output_fd != STDOUT_FILENO)
 372                 close(output_fd);
 373
 374         if (ssl_ctx)
 375                 ssl_ops->context_free(ssl_ctx);
 376
 377         return error_ret;
 378 }