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
  23 #include <libubox/blobmsg.h>
  24
  25 #include "uclient.h"
  26
  27 #ifdef __APPLE__
  28 #define LIB_EXT "dylib"
  29 #else
  30 #define LIB_EXT "so"
  31 #endif
  32
  33 static struct ustream_ssl_ctx *ssl_ctx;
  34 static const struct ustream_ssl_ops *ssl_ops;
  35
  36 static void example_header_done(struct uclient *cl)
  37 {
  38         struct blob_attr *cur;
  39         char local[INET6_ADDRSTRLEN], remote[INET6_ADDRSTRLEN];
  40         int local_port, remote_port;
  41         int rem;
  42
  43         uclient_get_addr(local, &local_port, &cl->local_addr);
  44         uclient_get_addr(remote, &remote_port, &cl->remote_addr);
  45
  46         fprintf(stderr, "Connected: %s:%d -> %s:%d\n",
  47                 local, local_port, remote, remote_port);
  48
  49         printf("Headers (%d): \n", cl->status_code);
  50         blobmsg_for_each_attr(cur, cl->meta, rem) {
  51                 printf("%s=%s\n", blobmsg_name(cur), (char *) blobmsg_data(cur));
  52         }
  53
  54         printf("Contents:\n");
  55 }
  56
  57 static void example_read_data(struct uclient *cl)
  58 {
  59         char buf[256];
  60         int len;
  61
  62         while (1) {
  63                 len = uclient_read(cl, buf, sizeof(buf));
  64                 if (!len)
  65                         return;
  66
  67                 write(STDOUT_FILENO, buf, len);
  68         }
  69 }
  70
  71 static void example_request_sm(struct uclient *cl)
  72 {
  73         static int i = 0;
  74
  75         switch (i++) {
  76         case 0:
  77                 uclient_connect(cl);
  78                 uclient_http_set_request_type(cl, "HEAD");
  79                 uclient_request(cl);
  80                 break;
  81         case 1:
  82                 uclient_connect(cl);
  83                 uclient_http_set_request_type(cl, "GET");
  84                 uclient_request(cl);
  85                 break;
  86         default:
  87                 uloop_end();
  88                 break;
  89         };
  90 }
  91
  92 static void example_eof(struct uclient *cl)
  93 {
  94         static int retries;
  95
  96         if (retries < 10 && uclient_http_redirect(cl)) {
  97                 retries++;
  98                 return;
  99         }
 100
 101         retries = 0;
 102         example_request_sm(cl);
 103 }
 104
 105 static void example_error(struct uclient *cl, int code)
 106 {
 107         fprintf(stderr, "Error %d!\n", code);
 108         example_request_sm(cl);
 109 }
 110
 111 static const struct uclient_cb cb = {
 112         .header_done = example_header_done,
 113         .data_read = example_read_data,
 114         .data_eof = example_eof,
 115         .error = example_error,
 116 };
 117
 118 static int usage(const char *progname)
 119 {
 120         fprintf(stderr,
 121                 "Usage: %s [options] <hostname> <port>\n"
 122                 "Options:\n"
 123                 "       -c <cert>:         Load CA certificates from file <cert>\n"
 124                 "       -C:                Skip certificate CN verification against hostname\n"
 125                 "\n", progname);
 126         return 1;
 127 }
 128
 129
 130 static void init_ustream_ssl(void)
 131 {
 132         void *dlh;
 133
 134         dlh = dlopen("libustream-ssl." LIB_EXT, RTLD_LAZY | RTLD_LOCAL);
 135         if (!dlh)
 136                 return;
 137
 138         ssl_ops = dlsym(dlh, "ustream_ssl_ops");
 139         if (!ssl_ops)
 140                 return;
 141
 142         ssl_ctx = ssl_ops->context_new(false);
 143 }
 144
 145 static int no_ssl(const char *progname)
 146 {
 147         fprintf(stderr, "%s: SSL support not available, please install ustream-ssl\n", progname);
 148         return 1;
 149 }
 150
 151
 152 int main(int argc, char **argv)
 153 {
 154         const char *progname = argv[0];
 155         struct uclient *cl;
 156         bool verify = true;
 157         int ch;
 158
 159         init_ustream_ssl();
 160
 161         while ((ch = getopt(argc, argv, "Cc:")) != -1) {
 162                 switch(ch) {
 163                 case 'c':
 164                         if (ssl_ctx)
 165                                 ssl_ops->context_add_ca_crt_file(ssl_ctx, optarg);
 166                         break;
 167                 case 'C':
 168                         verify = false;
 169                         break;
 170                 default:
 171                         return usage(progname);
 172                 }
 173         }
 174
 175         argv += optind;
 176         argc -= optind;
 177
 178         if (argc != 1)
 179                 return usage(progname);
 180
 181         if (!strncmp(argv[0], "https", 5) && !ssl_ctx)
 182                 return no_ssl(progname);
 183
 184         uloop_init();
 185
 186         cl = uclient_new(argv[0], NULL, &cb);
 187         if (!cl) {
 188                 fprintf(stderr, "Failed to allocate uclient context\n");
 189                 return 1;
 190         }
 191
 192         if (ssl_ctx)
 193                 uclient_http_set_ssl_ctx(cl, ssl_ops, ssl_ctx, verify);
 194
 195         example_request_sm(cl);
 196         uloop_run();
 197         uloop_done();
 198
 199         uclient_free(cl);
 200
 201         if (ssl_ctx)
 202                 ssl_ops->context_free(ssl_ctx);
 203
 204         return 0;
 205 }