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] <hostname> <port>\n"
 133                 "Options:\n"
 134                 "       -c <cert>:         Load CA certificates from file <cert>\n"
 135                 "       -C:                Skip certificate CN verification against hostname\n"
 136                 "\n", progname);
 137         return 1;
 138 }
 139
 140
 141 static void init_ustream_ssl(void)
 142 {
 143         void *dlh;
 144
 145         dlh = dlopen("libustream-ssl." LIB_EXT, RTLD_LAZY | RTLD_LOCAL);
 146         if (!dlh)
 147                 return;
 148
 149         ssl_ops = dlsym(dlh, "ustream_ssl_ops");
 150         if (!ssl_ops)
 151                 return;
 152
 153         ssl_ctx = ssl_ops->context_new(false);
 154 }
 155
 156 static int no_ssl(const char *progname)
 157 {
 158         fprintf(stderr, "%s: SSL support not available, please install ustream-ssl\n", progname);
 159         return 1;
 160 }
 161
 162 enum {
 163         L_NO_CHECK_CERTIFICATE,
 164         L_CA_CERTIFICATE,
 165 };
 166
 167 static const struct option longopts[] = {
 168         [L_NO_CHECK_CERTIFICATE] = { "no-check-certificate", no_argument },
 169         [L_CA_CERTIFICATE] = { "ca-certificate", required_argument },
 170         {}
 171 };
 172
 173 int main(int argc, char **argv)
 174 {
 175         const char *progname = argv[0];
 176         struct uclient *cl;
 177         bool verify = true;
 178         int ch;
 179         int longopt_idx = 0;
 180
 181         init_ustream_ssl();
 182
 183         while ((ch = getopt_long(argc, argv, "q", longopts, &longopt_idx)) != -1) {
 184                 switch(ch) {
 185                 case 0:
 186                         switch (longopt_idx) {
 187                         case L_NO_CHECK_CERTIFICATE:
 188                                 verify = false;
 189                                 break;
 190                         case L_CA_CERTIFICATE:
 191                                 if (ssl_ctx)
 192                                         ssl_ops->context_add_ca_crt_file(ssl_ctx, optarg);
 193                                 break;
 194                         default:
 195                                 return usage(progname);
 196                         }
 197                         break;
 198                 case 'q':
 199                         quiet = true;
 200                         break;
 201                 default:
 202                         return usage(progname);
 203                 }
 204         }
 205
 206         argv += optind;
 207         argc -= optind;
 208
 209         if (argc != 1)
 210                 return usage(progname);
 211
 212         if (!strncmp(argv[0], "https", 5) && !ssl_ctx)
 213                 return no_ssl(progname);
 214
 215         uloop_init();
 216
 217         cl = uclient_new(argv[0], NULL, &cb);
 218         if (!cl) {
 219                 fprintf(stderr, "Failed to allocate uclient context\n");
 220                 return 1;
 221         }
 222
 223         if (ssl_ctx)
 224                 uclient_http_set_ssl_ctx(cl, ssl_ops, ssl_ctx, verify);
 225
 226         example_request_sm(cl);
 227         uloop_run();
 228         uloop_done();
 229
 230         uclient_free(cl);
 231
 232         if (ssl_ctx)
 233                 ssl_ops->context_free(ssl_ctx);
 234
 235         return 0;
 236 }