uclient-example.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
  24 #include <libubox/blobmsg.h>
  25
  26 #include "uclient.h"
  27
  28 #ifdef __APPLE__
  29 #define LIB_EXT "dylib"
  30 #else
  31 #define LIB_EXT "so"
  32 #endif
  33
  34 static struct ustream_ssl_ctx *ssl_ctx;
  35 static const struct ustream_ssl_ops *ssl_ops;
  36 static int quiet = false;
  37
  38 static void example_header_done(struct uclient *cl)
  39 {
  40         struct blob_attr *cur;
  41         int rem;
  42
  43         if (quiet)
  44                 return;
  45
  46         printf("Headers (%d): \n", cl->status_code);
  47         blobmsg_for_each_attr(cur, cl->meta, rem) {
  48                 printf("%s=%s\n", blobmsg_name(cur), (char *) blobmsg_data(cur));
  49         }
  50
  51         printf("Contents:\n");
  52 }
  53
  54 static void example_read_data(struct uclient *cl)
  55 {
  56         char buf[256];
  57         int len;
  58
  59         while (1) {
  60                 len = uclient_read(cl, buf, sizeof(buf));
  61                 if (!len)
  62                         return;
  63
  64                 write(STDOUT_FILENO, buf, len);
  65         }
  66 }
  67
  68 static void msg_connecting(struct uclient *cl)
  69 {
  70         char addr[INET6_ADDRSTRLEN];
  71         int port;
  72
  73         if (quiet)
  74                 return;
  75
  76         uclient_get_addr(addr, &port, &cl->remote_addr);
  77         fprintf(stderr, "Connecting to %s %s:%d\n", cl->url->host, addr, port);
  78 }
  79
  80 static void example_request_sm(struct uclient *cl)
  81 {
  82         static int i = 0;
  83
  84         switch (i++) {
  85         case 0:
  86                 uclient_connect(cl);
  87                 msg_connecting(cl);
  88                 uclient_http_set_request_type(cl, "HEAD");
  89                 uclient_request(cl);
  90                 break;
  91         case 1:
  92                 uclient_connect(cl);
  93                 uclient_http_set_request_type(cl, "GET");
  94                 uclient_request(cl);
  95                 break;
  96         default:
  97                 uloop_end();
  98                 break;
  99         };
 100 }
 101
 102 static void example_eof(struct uclient *cl)
 103 {
 104         static int retries;
 105
 106         if (retries < 10 && uclient_http_redirect(cl)) {
 107                 retries++;
 108                 return;
 109         }
 110
 111         retries = 0;
 112         example_request_sm(cl);
 113 }
 114
 115 static void example_error(struct uclient *cl, int code)
 116 {
 117         if (!quiet)
 118                 fprintf(stderr, "Error %d!\n", code);
 119         example_request_sm(cl);
 120 }
 121
 122 static const struct uclient_cb cb = {
 123         .header_done = example_header_done,
 124         .data_read = example_read_data,
 125         .data_eof = example_eof,
 126         .error = example_error,
 127 };
 128
 129 static int usage(const char *progname)
 130 {
 131         fprintf(stderr,
 132                 "Usage: %s [options] <URL>\n"
 133                 "Options:\n"
 134                 "\n"
 135                 "HTTPS options:\n"
 136                 "       --ca-certificate=<cert>:        Load CA certificates from file <cert>\n"
 137                 "       --no-check-certificate:         don't validate the server's certificate\n"
 138                 "\n", progname);
 139         return 1;
 140 }
 141
 142
 143 static void init_ustream_ssl(void)
 144 {
 145         void *dlh;
 146
 147         dlh = dlopen("libustream-ssl." LIB_EXT, RTLD_LAZY | RTLD_LOCAL);
 148         if (!dlh)
 149                 return;
 150
 151         ssl_ops = dlsym(dlh, "ustream_ssl_ops");
 152         if (!ssl_ops)
 153                 return;
 154
 155         ssl_ctx = ssl_ops->context_new(false);
 156 }
 157
 158 static int no_ssl(const char *progname)
 159 {
 160         fprintf(stderr, "%s: SSL support not available, please install ustream-ssl\n", progname);
 161         return 1;
 162 }
 163
 164 enum {
 165         L_NO_CHECK_CERTIFICATE,
 166         L_CA_CERTIFICATE,
 167 };
 168
 169 static const struct option longopts[] = {
 170         [L_NO_CHECK_CERTIFICATE] = { "no-check-certificate", no_argument },
 171         [L_CA_CERTIFICATE] = { "ca-certificate", required_argument },
 172         {}
 173 };
 174
 175 int main(int argc, char **argv)
 176 {
 177         const char *progname = argv[0];
 178         struct uclient *cl;
 179         bool verify = true;
 180         int ch;
 181         int longopt_idx = 0;
 182
 183         init_ustream_ssl();
 184
 185         while ((ch = getopt_long(argc, argv, "q", longopts, &longopt_idx)) != -1) {
 186                 switch(ch) {
 187                 case 0:
 188                         switch (longopt_idx) {
 189                         case L_NO_CHECK_CERTIFICATE:
 190                                 verify = false;
 191                                 break;
 192                         case L_CA_CERTIFICATE:
 193                                 if (ssl_ctx)
 194                                         ssl_ops->context_add_ca_crt_file(ssl_ctx, optarg);
 195                                 break;
 196                         default:
 197                                 return usage(progname);
 198                         }
 199                         break;
 200                 case 'q':
 201                         quiet = true;
 202                         break;
 203                 default:
 204                         return usage(progname);
 205                 }
 206         }
 207
 208         argv += optind;
 209         argc -= optind;
 210
 211         if (argc != 1)
 212                 return usage(progname);
 213
 214         if (!strncmp(argv[0], "https", 5) && !ssl_ctx)
 215                 return no_ssl(progname);
 216
 217         uloop_init();
 218
 219         cl = uclient_new(argv[0], NULL, &cb);
 220         if (!cl) {
 221                 fprintf(stderr, "Failed to allocate uclient context\n");
 222                 return 1;
 223         }
 224
 225         if (ssl_ctx)
 226                 uclient_http_set_ssl_ctx(cl, ssl_ops, ssl_ctx, verify);
 227
 228         example_request_sm(cl);
 229         uloop_run();
 230         uloop_done();
 231
 232         uclient_free(cl);
 233
 234         if (ssl_ctx)
 235                 ssl_ops->context_free(ssl_ctx);
 236
 237         return 0;
 238 }