FFmpeg
tls.c
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1 /*
2  * TLS/SSL Protocol
3  * Copyright (c) 2011 Martin Storsjo
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include "avformat.h"
23 #include "internal.h"
24 #include "network.h"
25 #include "os_support.h"
26 #include "url.h"
27 #include "tls.h"
28 #include "libavutil/avstring.h"
29 #include "libavutil/opt.h"
30 #include "libavutil/parseutils.h"
31 
32 static void set_options(TLSShared *c, const char *uri)
33 {
34  char buf[1024];
35  const char *p = strchr(uri, '?');
36  if (!p)
37  return;
38 
39  if (!c->ca_file && av_find_info_tag(buf, sizeof(buf), "cafile", p))
40  c->ca_file = av_strdup(buf);
41 
42  if (!c->verify && av_find_info_tag(buf, sizeof(buf), "verify", p)) {
43  char *endptr = NULL;
44  c->verify = strtol(buf, &endptr, 10);
45  if (buf == endptr)
46  c->verify = 1;
47  }
48 
49  if (!c->cert_file && av_find_info_tag(buf, sizeof(buf), "cert", p))
50  c->cert_file = av_strdup(buf);
51 
52  if (!c->key_file && av_find_info_tag(buf, sizeof(buf), "key", p))
53  c->key_file = av_strdup(buf);
54 }
55 
57 {
58  int port;
59  const char *p;
60  char buf[200], opts[50] = "";
61  struct addrinfo hints = { 0 }, *ai = NULL;
62  const char *proxy_path;
63  int use_proxy;
64 
65  set_options(c, uri);
66 
67  if (c->listen)
68  snprintf(opts, sizeof(opts), "?listen=1");
69 
70  av_url_split(NULL, 0, NULL, 0, c->underlying_host, sizeof(c->underlying_host), &port, NULL, 0, uri);
71 
72  p = strchr(uri, '?');
73 
74  if (!p) {
75  p = opts;
76  } else {
77  if (av_find_info_tag(opts, sizeof(opts), "listen", p))
78  c->listen = 1;
79  }
80 
81  ff_url_join(buf, sizeof(buf), "tcp", NULL, c->underlying_host, port, "%s", p);
82 
83  hints.ai_flags = AI_NUMERICHOST;
84  if (!getaddrinfo(c->underlying_host, NULL, &hints, &ai)) {
85  c->numerichost = 1;
86  freeaddrinfo(ai);
87  }
88 
89  if (!c->host && !(c->host = av_strdup(c->underlying_host)))
90  return AVERROR(ENOMEM);
91 
92  proxy_path = getenv("http_proxy");
93  use_proxy = !ff_http_match_no_proxy(getenv("no_proxy"), c->underlying_host) &&
94  proxy_path && av_strstart(proxy_path, "http://", NULL);
95 
96  if (use_proxy) {
97  char proxy_host[200], proxy_auth[200], dest[200];
98  int proxy_port;
99  av_url_split(NULL, 0, proxy_auth, sizeof(proxy_auth),
100  proxy_host, sizeof(proxy_host), &proxy_port, NULL, 0,
101  proxy_path);
102  ff_url_join(dest, sizeof(dest), NULL, NULL, c->underlying_host, port, NULL);
103  ff_url_join(buf, sizeof(buf), "httpproxy", proxy_auth, proxy_host,
104  proxy_port, "/%s", dest);
105  }
106 
108  &parent->interrupt_callback, options,
109  parent->protocol_whitelist, parent->protocol_blacklist, parent);
110 }
void av_url_split(char *proto, int proto_size, char *authorization, int authorization_size, char *hostname, int hostname_size, int *port_ptr, char *path, int path_size, const char *url)
Split a URL string into components.
Definition: utils.c:4730
#define NULL
Definition: coverity.c:32
int ffurl_open_whitelist(URLContext **puc, const char *filename, int flags, const AVIOInterruptCB *int_cb, AVDictionary **options, const char *whitelist, const char *blacklist, URLContext *parent)
Create an URLContext for accessing to the resource indicated by url, and open it. ...
Definition: avio.c:307
static void set_options(TLSShared *c, const char *uri)
Definition: tls.c:32
int verify
Definition: tls.h:31
AVIOInterruptCB interrupt_callback
Definition: url.h:47
int listen
Definition: tls.h:34
#define freeaddrinfo
Definition: network.h:215
#define AI_NUMERICHOST
Definition: network.h:184
AVOptions.
miscellaneous OS support macros and functions.
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
Definition: tls.h:29
int av_find_info_tag(char *arg, int arg_size, const char *tag1, const char *info)
Attempt to find a specific tag in a URL.
Definition: parseutils.c:749
char underlying_host[200]
Definition: tls.h:38
const char * protocol_whitelist
Definition: url.h:49
char * host
Definition: tls.h:36
AVDictionary * opts
Definition: movenc.c:50
int ff_http_match_no_proxy(const char *no_proxy, const char *hostname)
Definition: network.c:551
char * cert_file
Definition: tls.h:32
char * ca_file
Definition: tls.h:30
int ff_url_join(char *str, int size, const char *proto, const char *authorization, const char *hostname, int port, const char *fmt,...)
Definition: url.c:36
char * av_strdup(const char *s)
Duplicate a string.
Definition: mem.c:251
const char * protocol_blacklist
Definition: url.h:50
void * buf
Definition: avisynth_c.h:766
Definition: url.h:38
#define AVIO_FLAG_READ_WRITE
read-write pseudo flag
Definition: avio.h:656
#define snprintf
Definition: snprintf.h:34
misc parsing utilities
int av_strstart(const char *str, const char *pfx, const char **ptr)
Return non-zero if pfx is a prefix of str.
Definition: avstring.c:34
#define getaddrinfo
Definition: network.h:214
Main libavformat public API header.
const OptionDef options[]
Definition: ffmpeg_opt.c:3364
int ff_tls_open_underlying(TLSShared *c, URLContext *parent, const char *uri, AVDictionary **options)
Definition: tls.c:56
URLContext * tcp
Definition: tls.h:41
int numerichost
Definition: tls.h:39
int ai_flags
Definition: network.h:135
unbuffered private I/O API
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later.That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another.Frame references ownership and permissions
char * key_file
Definition: tls.h:33