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 #include <unistd.h>
  20 #include <stdio.h>
  21 #include <dlfcn.h>
  22 #include <getopt.h>
  23 #include <fcntl.h>
  24
  25 #include <libubox/blobmsg.h>
  26
  27 #include "uclient.h"
  28 #include "uclient-utils.h"
  29
  30 #ifdef __APPLE__
  31 #define LIB_EXT "dylib"
  32 #else
  33 #define LIB_EXT "so"
  34 #endif
  35
  36 static struct ustream_ssl_ctx *ssl_ctx;
  37 static const struct ustream_ssl_ops *ssl_ops;
  38 static int quiet = false;
  39 static bool verify = true;
  40 static const char *output_file;
  41 static int output_fd = -1;
  42 static int error_ret;
  43
  44 static int open_output_file(const char *path, bool create)
  45 {
  46         char *filename;
  47         int flags = O_WRONLY;
  48         int ret;
  49
  50         if (create)
  51                 flags |= O_CREAT;
  52
  53         if (output_file) {
  54                 if (!strcmp(output_file, "-"))
  55                         return STDOUT_FILENO;
  56
  57                 return open(output_file, flags, 0644);
  58         }
  59
  60         /* Don't automatically overwrite files if the name is derived from the URL */
  61         if (create)
  62                 flags |= O_EXCL;
  63
  64         filename = uclient_get_url_filename(path, "index.html");
  65         ret = open(filename, flags, 0644);
  66         free(filename);
  67
  68         return ret;
  69 }
  70
  71 static void request_done(struct uclient *cl)
  72 {
  73         if (output_fd >= 0 && !output_file) {
  74                 close(output_fd);
  75                 output_fd = -1;
  76         }
  77         uclient_disconnect(cl);
  78         uloop_end();
  79 }
  80
  81 static void header_done_cb(struct uclient *cl)
  82 {
  83         static int retries;
  84
  85         if (retries < 10 && uclient_http_redirect(cl)) {
  86                 if (!quiet)
  87                         fprintf(stderr, "Redirected to %s on %s\n", cl->url->location, cl->url->host);
  88
  89                 retries++;
  90                 return;
  91         }
  92
  93         retries = 0;
  94         switch (cl->status_code) {
  95         case 204:
  96         case 200:
  97                 output_fd = open_output_file(cl->url->location, true);
  98                 if (output_fd < 0) {
  99                         if (!quiet)
 100                                 perror("Cannot open output file");
 101                         error_ret = 3;
 102                         request_done(cl);
 103                 }
 104                 break;
 105
 106         default:
 107                 if (!quiet)
 108                         fprintf(stderr, "HTTP error %d\n", cl->status_code);
 109                 request_done(cl);
 110                 error_ret = 8;
 111                 break;
 112         }
 113 }
 114
 115 static void read_data_cb(struct uclient *cl)
 116 {
 117         char buf[256];
 118         int len;
 119
 120         if (output_fd < 0)
 121                 return;
 122
 123         while (1) {
 124                 len = uclient_read(cl, buf, sizeof(buf));
 125                 if (!len)
 126                         return;
 127
 128                 write(output_fd, buf, len);
 129         }
 130 }
 131
 132 static void msg_connecting(struct uclient *cl)
 133 {
 134         char addr[INET6_ADDRSTRLEN];
 135         int port;
 136
 137         if (quiet)
 138                 return;
 139
 140         uclient_get_addr(addr, &port, &cl->remote_addr);
 141         fprintf(stderr, "Connecting to %s %s:%d\n", cl->url->host, addr, port);
 142 }
 143
 144 static void init_request(struct uclient *cl)
 145 {
 146         uclient_connect(cl);
 147         msg_connecting(cl);
 148         uclient_http_set_request_type(cl, "GET");
 149         uclient_request(cl);
 150 }
 151
 152 static void eof_cb(struct uclient *cl)
 153 {
 154         request_done(cl);
 155 }
 156
 157 static void handle_uclient_error(struct uclient *cl, int code)
 158 {
 159         const char *type = "Unknown error";
 160         bool ignore = false;
 161
 162         switch(code) {
 163         case UCLIENT_ERROR_CONNECT:
 164                 type = "Connection failed";
 165                 error_ret = 4;
 166                 break;
 167         case UCLIENT_ERROR_SSL_INVALID_CERT:
 168                 type = "Invalid SSL certificate";
 169                 ignore = !verify;
 170                 error_ret = 5;
 171                 break;
 172         case UCLIENT_ERROR_SSL_CN_MISMATCH:
 173                 type = "Server hostname does not match SSL certificate";
 174                 ignore = !verify;
 175                 error_ret = 5;
 176                 break;
 177         default:
 178                 error_ret = 1;
 179                 break;
 180         }
 181
 182         if (!quiet)
 183                 fprintf(stderr, "Connection error: %s%s\n", type, ignore ? " (ignored)" : "");
 184
 185         if (ignore)
 186                 error_ret = 0;
 187         else
 188                 request_done(cl);
 189 }
 190
 191 static const struct uclient_cb cb = {
 192         .header_done = header_done_cb,
 193         .data_read = read_data_cb,
 194         .data_eof = eof_cb,
 195         .error = handle_uclient_error,
 196 };
 197
 198 static int usage(const char *progname)
 199 {
 200         fprintf(stderr,
 201                 "Usage: %s [options] <URL>\n"
 202                 "Options:\n"
 203                 "       -q:                             Turn off status messages\n"
 204                 "       -O <file>:                      Redirect output to file (use \"-\" for stdout)\n"
 205                 "\n"
 206                 "HTTPS options:\n"
 207                 "       --ca-certificate=<cert>:        Load CA certificates from file <cert>\n"
 208                 "       --no-check-certificate:         don't validate the server's certificate\n"
 209                 "\n", progname);
 210         return 1;
 211 }
 212
 213
 214 static void init_ustream_ssl(void)
 215 {
 216         void *dlh;
 217
 218         dlh = dlopen("libustream-ssl." LIB_EXT, RTLD_LAZY | RTLD_LOCAL);
 219         if (!dlh)
 220                 return;
 221
 222         ssl_ops = dlsym(dlh, "ustream_ssl_ops");
 223         if (!ssl_ops)
 224                 return;
 225
 226         ssl_ctx = ssl_ops->context_new(false);
 227 }
 228
 229 static int no_ssl(const char *progname)
 230 {
 231         fprintf(stderr, "%s: SSL support not available, please install ustream-ssl\n", progname);
 232         return 1;
 233 }
 234
 235 enum {
 236         L_NO_CHECK_CERTIFICATE,
 237         L_CA_CERTIFICATE,
 238 };
 239
 240 static const struct option longopts[] = {
 241         [L_NO_CHECK_CERTIFICATE] = { "no-check-certificate", no_argument },
 242         [L_CA_CERTIFICATE] = { "ca-certificate", required_argument },
 243         {}
 244 };
 245
 246 int main(int argc, char **argv)
 247 {
 248         const char *progname = argv[0];
 249         struct uclient *cl;
 250         int ch;
 251         int longopt_idx = 0;
 252
 253         init_ustream_ssl();
 254
 255         while ((ch = getopt_long(argc, argv, "qO:", longopts, &longopt_idx)) != -1) {
 256                 switch(ch) {
 257                 case 0:
 258                         switch (longopt_idx) {
 259                         case L_NO_CHECK_CERTIFICATE:
 260                                 verify = false;
 261                                 break;
 262                         case L_CA_CERTIFICATE:
 263                                 if (ssl_ctx)
 264                                         ssl_ops->context_add_ca_crt_file(ssl_ctx, optarg);
 265                                 break;
 266                         default:
 267                                 return usage(progname);
 268                         }
 269                         break;
 270                 case 'O':
 271                         output_file = optarg;
 272                         break;
 273                 case 'q':
 274                         quiet = true;
 275                         break;
 276                 default:
 277                         return usage(progname);
 278                 }
 279         }
 280
 281         argv += optind;
 282         argc -= optind;
 283
 284         if (argc != 1)
 285                 return usage(progname);
 286
 287         if (!strncmp(argv[0], "https", 5) && !ssl_ctx)
 288                 return no_ssl(progname);
 289
 290         uloop_init();
 291
 292         cl = uclient_new(argv[0], NULL, &cb);
 293         if (!cl) {
 294                 fprintf(stderr, "Failed to allocate uclient context\n");
 295                 return 1;
 296         }
 297
 298         if (ssl_ctx)
 299                 uclient_http_set_ssl_ctx(cl, ssl_ops, ssl_ctx, verify);
 300
 301         init_request(cl);
 302         uloop_run();
 303         uloop_done();
 304
 305         uclient_free(cl);
 306
 307         if (output_fd >= 0 && output_fd != STDOUT_FILENO)
 308                 close(output_fd);
 309
 310         if (ssl_ctx)
 311                 ssl_ops->context_free(ssl_ctx);
 312
 313         return error_ret;
 314 }