ustream-example-client.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <unistd.h>
   4
   5 #include <libubox/usock.h>
   6 #include <libubox/uloop.h>
   7 #include "ustream-ssl.h"
   8
   9 static struct uloop_fd fd;
  10
  11 static struct ustream_fd stream, s_input;
  12 static struct ustream_ssl ssl;
  13 static const char *host, *port;
  14
  15 static void *ctx;
  16
  17 static void client_teardown(void)
  18 {
  19         if (s_input.fd.registered)
  20                 ustream_free(&s_input.stream);
  21
  22         ustream_free(&ssl.stream);
  23         ustream_free(&stream.stream);
  24         close(stream.fd.fd);
  25         uloop_end();
  26 }
  27
  28 static void client_input_notify_read(struct ustream *s, int bytes)
  29 {
  30         char *buf;
  31         int len;
  32
  33         buf = ustream_get_read_buf(s, &len);
  34         ustream_write(&ssl.stream, buf, len, false);
  35         ustream_consume(s, len);
  36 }
  37
  38 static void client_ssl_notify_read(struct ustream *s, int bytes)
  39 {
  40         char *buf;
  41         int len;
  42
  43         buf = ustream_get_read_buf(s, &len);
  44         fwrite(buf, len, 1, stdout);
  45         fflush(stdout);
  46         ustream_consume(s, len);
  47 }
  48
  49 static void client_notify_connected(struct ustream_ssl *ssl)
  50 {
  51         fprintf(stderr, "SSL connection established (CN verified: %d)\n", ssl->valid_cn);
  52         s_input.stream.notify_read = client_input_notify_read;
  53         ustream_fd_init(&s_input, 0);
  54 }
  55
  56 static void client_notify_error(struct ustream_ssl *ssl, int error, const char *str)
  57 {
  58         fprintf(stderr, "SSL connection error(%d): %s\n", error, str);
  59         client_teardown();
  60 }
  61
  62 static void client_notify_verify_error(struct ustream_ssl *ssl, int error, const char *str)
  63 {
  64         fprintf(stderr, "WARNING: SSL certificate error(%d): %s\n", error, str);
  65 }
  66
  67 static void client_notify_state(struct ustream *us)
  68 {
  69         if (!us->write_error && !us->eof)
  70                 return;
  71
  72         fprintf(stderr, "Connection closed\n");
  73         client_teardown();
  74 }
  75
  76 static void example_connect_ssl(int fd)
  77 {
  78         fprintf(stderr, "Starting SSL negnotiation\n");
  79
  80         ssl.notify_error = client_notify_error;
  81         ssl.notify_verify_error = client_notify_verify_error;
  82         ssl.notify_connected = client_notify_connected;
  83         ssl.stream.notify_read = client_ssl_notify_read;
  84         ssl.stream.notify_state = client_notify_state;
  85
  86         ustream_fd_init(&stream, fd);
  87         ustream_ssl_init(&ssl, &stream.stream, ctx, false);
  88         ustream_ssl_set_peer_cn(&ssl, host);
  89 }
  90
  91 static void example_connect_cb(struct uloop_fd *f, unsigned int events)
  92 {
  93         if (fd.eof || fd.error) {
  94                 fprintf(stderr, "Connection failed\n");
  95                 uloop_end();
  96                 return;
  97         }
  98
  99         fprintf(stderr, "Connection established\n");
 100         uloop_fd_delete(&fd);
 101         example_connect_ssl(fd.fd);
 102 }
 103
 104 static void connect_client(void)
 105 {
 106         fd.fd = usock(USOCK_TCP | USOCK_NONBLOCK, host, port);
 107         fd.cb = example_connect_cb;
 108         uloop_fd_add(&fd, ULOOP_WRITE | ULOOP_EDGE_TRIGGER);
 109 }
 110
 111 static int usage(const char *progname)
 112 {
 113         fprintf(stderr,
 114                 "Usage: %s [options] <hostname> <port>\n"
 115                 "Options:\n"
 116                 "       -c <cert>:         Load CA certificates from file <cert>\n"
 117                 "\n", progname);
 118         return 1;
 119 }
 120
 121 int main(int argc, char **argv)
 122 {
 123         const char *progname = argv[0];
 124         int ch;
 125
 126         ctx = ustream_ssl_context_new(false);
 127
 128         while ((ch = getopt(argc, argv, "c:")) != -1) {
 129                 switch(ch) {
 130                 case 'c':
 131                         ustream_ssl_context_add_ca_crt_file(ctx, optarg);
 132                         break;
 133                 default:
 134                         return usage(progname);
 135                 }
 136         }
 137
 138         argv += optind;
 139         argc -= optind;
 140
 141         if (argc != 2)
 142                 return usage(progname);
 143
 144         uloop_init();
 145         host = argv[0];
 146         port = argv[1];
 147         connect_client();
 148         uloop_run();
 149
 150         close(fd.fd);
 151         uloop_done();
 152         return 0;
 153 }