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