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 init_request(struct uclient *cl)
  81 {
  82         uclient_connect(cl);
  83         msg_connecting(cl);
  84         uclient_http_set_request_type(cl, "GET");
  85         uclient_request(cl);
  86 }
  87
  88 static void request_done(struct uclient *cl)
  89 {
  90         uloop_end();
  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         request_done(cl);
 104 }
 105
 106 static void example_error(struct uclient *cl, int code)
 107 {
 108         if (!quiet)
 109                 fprintf(stderr, "Error %d!\n", code);
 110
 111         request_done(cl);
 112 }
 113
 114 static const struct uclient_cb cb = {
 115         .header_done = example_header_done,
 116         .data_read = example_read_data,
 117         .data_eof = example_eof,
 118         .error = example_error,
 119 };
 120
 121 static int usage(const char *progname)
 122 {
 123         fprintf(stderr,
 124                 "Usage: %s [options] <URL>\n"
 125                 "Options:\n"
 126                 "\n"
 127                 "HTTPS options:\n"
 128                 "       --ca-certificate=<cert>:        Load CA certificates from file <cert>\n"
 129                 "       --no-check-certificate:         don't validate the server's certificate\n"
 130                 "\n", progname);
 131         return 1;
 132 }
 133
 134
 135 static void init_ustream_ssl(void)
 136 {
 137         void *dlh;
 138
 139         dlh = dlopen("libustream-ssl." LIB_EXT, RTLD_LAZY | RTLD_LOCAL);
 140         if (!dlh)
 141                 return;
 142
 143         ssl_ops = dlsym(dlh, "ustream_ssl_ops");
 144         if (!ssl_ops)
 145                 return;
 146
 147         ssl_ctx = ssl_ops->context_new(false);
 148 }
 149
 150 static int no_ssl(const char *progname)
 151 {
 152         fprintf(stderr, "%s: SSL support not available, please install ustream-ssl\n", progname);
 153         return 1;
 154 }
 155
 156 enum {
 157         L_NO_CHECK_CERTIFICATE,
 158         L_CA_CERTIFICATE,
 159 };
 160
 161 static const struct option longopts[] = {
 162         [L_NO_CHECK_CERTIFICATE] = { "no-check-certificate", no_argument },
 163         [L_CA_CERTIFICATE] = { "ca-certificate", required_argument },
 164         {}
 165 };
 166
 167 int main(int argc, char **argv)
 168 {
 169         const char *progname = argv[0];
 170         struct uclient *cl;
 171         bool verify = true;
 172         int ch;
 173         int longopt_idx = 0;
 174
 175         init_ustream_ssl();
 176
 177         while ((ch = getopt_long(argc, argv, "q", longopts, &longopt_idx)) != -1) {
 178                 switch(ch) {
 179                 case 0:
 180                         switch (longopt_idx) {
 181                         case L_NO_CHECK_CERTIFICATE:
 182                                 verify = false;
 183                                 break;
 184                         case L_CA_CERTIFICATE:
 185                                 if (ssl_ctx)
 186                                         ssl_ops->context_add_ca_crt_file(ssl_ctx, optarg);
 187                                 break;
 188                         default:
 189                                 return usage(progname);
 190                         }
 191                         break;
 192                 case 'q':
 193                         quiet = true;
 194                         break;
 195                 default:
 196                         return usage(progname);
 197                 }
 198         }
 199
 200         argv += optind;
 201         argc -= optind;
 202
 203         if (argc != 1)
 204                 return usage(progname);
 205
 206         if (!strncmp(argv[0], "https", 5) && !ssl_ctx)
 207                 return no_ssl(progname);
 208
 209         uloop_init();
 210
 211         cl = uclient_new(argv[0], NULL, &cb);
 212         if (!cl) {
 213                 fprintf(stderr, "Failed to allocate uclient context\n");
 214                 return 1;
 215         }
 216
 217         if (ssl_ctx)
 218                 uclient_http_set_ssl_ctx(cl, ssl_ops, ssl_ctx, verify);
 219
 220         init_request(cl);
 221         uloop_run();
 222         uloop_done();
 223
 224         uclient_free(cl);
 225
 226         if (ssl_ctx)
 227                 ssl_ops->context_free(ssl_ctx);
 228
 229         return 0;
 230 }