example: make ustream-ssl optional (load via dlopen)

[project/uclient.git] / uclient-example.c

diff --git a/uclient-example.c b/uclient-example.c
index 07b330d..e0e9015 100644 (file)
--- a/uclient-example.c
+++ b/uclient-example.c
@@ -1,15 +1,52 @@
-#include <libubox/blobmsg.h>
+/*
+ * uclient - ustream based protocol client library
+ *
+ * Copyright (C) 2014 Felix Fietkau <nbd@openwrt.org>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
 #include <unistd.h>
 #include <stdio.h>
+#include <dlfcn.h>
+
+#include <libubox/blobmsg.h>
 
 #include "uclient.h"
 
+#ifdef __APPLE__
+#define LIB_EXT "dylib"
+#else
+#define LIB_EXT "so"
+#endif
+
+static struct ustream_ssl_ctx *ssl_ctx;
+static const struct ustream_ssl_ops *ssl_ops;
+
 static void example_header_done(struct uclient *cl)
 {
        struct blob_attr *cur;
+       char local[INET6_ADDRSTRLEN], remote[INET6_ADDRSTRLEN];
+       int local_port, remote_port;
        int rem;
 
-       printf("Headers: \n");
+       uclient_get_addr(local, &local_port, &cl->local_addr);
+       uclient_get_addr(remote, &remote_port, &cl->remote_addr);
+
+       fprintf(stderr, "Connected: %s:%d -> %s:%d\n",
+               local, local_port, remote, remote_port);
+
+       printf("Headers (%d): \n", cl->status_code);
        blobmsg_for_each_attr(cur, cl->meta, rem) {
                printf("%s=%s\n", blobmsg_name(cur), (char *) blobmsg_data(cur));
        }
@@ -47,7 +84,6 @@ static void example_request_sm(struct uclient *cl)
                uclient_request(cl);
                break;
        default:
-               uclient_free(cl);
                uloop_end();
                break;
        };
@@ -55,6 +91,20 @@ static void example_request_sm(struct uclient *cl)
 
 static void example_eof(struct uclient *cl)
 {
+       static int retries;
+
+       if (retries < 10 && uclient_http_redirect(cl)) {
+               retries++;
+               return;
+       }
+
+       retries = 0;
+       example_request_sm(cl);
+}
+
+static void example_error(struct uclient *cl, int code)
+{
+       fprintf(stderr, "Error %d!\n", code);
        example_request_sm(cl);
 }
 
@@ -62,26 +112,94 @@ static const struct uclient_cb cb = {
        .header_done = example_header_done,
        .data_read = example_read_data,
        .data_eof = example_eof,
+       .error = example_error,
 };
 
+static int usage(const char *progname)
+{
+       fprintf(stderr,
+               "Usage: %s [options] <hostname> <port>\n"
+               "Options:\n"
+               "       -c <cert>:         Load CA certificates from file <cert>\n"
+               "       -C:                Skip certificate CN verification against hostname\n"
+               "\n", progname);
+       return 1;
+}
+
+
+static void init_ustream_ssl(void)
+{
+       void *dlh;
+
+       dlh = dlopen("libustream-ssl." LIB_EXT, RTLD_LAZY | RTLD_LOCAL);
+       if (!dlh)
+               return;
+
+       ssl_ops = dlsym(dlh, "ustream_ssl_ops");
+       if (!ssl_ops)
+               return;
+
+       ssl_ctx = ssl_ops->context_new(false);
+}
+
+static int no_ssl(const char *progname)
+{
+       fprintf(stderr, "%s: SSL support not available, please install ustream-ssl\n", progname);
+       return 1;
+}
+
+
 int main(int argc, char **argv)
 {
+       const char *progname = argv[0];
        struct uclient *cl;
+       bool verify = true;
+       int ch;
 
-       if (argc != 2) {
-               fprintf(stderr, "Usage: %s <URL>\n", argv[0]);
-               return 1;
+       init_ustream_ssl();
+
+       while ((ch = getopt(argc, argv, "Cc:")) != -1) {
+               switch(ch) {
+               case 'c':
+                       if (ssl_ctx)
+                               ssl_ops->context_add_ca_crt_file(ssl_ctx, optarg);
+                       break;
+               case 'C':
+                       verify = false;
+                       break;
+               default:
+                       return usage(progname);
+               }
        }
 
+       argv += optind;
+       argc -= optind;
+
+       if (argc != 1)
+               return usage(progname);
+
+       if (!strncmp(argv[0], "https", 5) && !ssl_ctx)
+               return no_ssl(progname);
+
        uloop_init();
-       cl = uclient_new(argv[1], &cb);
+
+       cl = uclient_new(argv[0], NULL, &cb);
        if (!cl) {
                fprintf(stderr, "Failed to allocate uclient context\n");
                return 1;
        }
+
+       if (ssl_ctx)
+               uclient_http_set_ssl_ctx(cl, ssl_ops, ssl_ctx, verify);
+
        example_request_sm(cl);
        uloop_run();
        uloop_done();
 
+       uclient_free(cl);
+
+       if (ssl_ctx)
+               ssl_ops->context_free(ssl_ctx);
+
        return 0;
 }