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 "network.h"
24 #include "os_support.h"
25 #include "url.h"
26 #include "tls.h"
27 #include "libavutil/avstring.h"
28 #include "libavutil/getenv_utf8.h"
29 #include "libavutil/mem.h"
30 #include "libavutil/parseutils.h"
31 
32 static int set_options(TLSShared *c, const char *uri)
33 {
34  char buf[1024];
35  const char *p = strchr(uri, '?');
36  if (!p)
37  return 0;
38 
39  if (!c->ca_file && av_find_info_tag(buf, sizeof(buf), "cafile", p)) {
40  c->ca_file = av_strdup(buf);
41  if (!c->ca_file)
42  return AVERROR(ENOMEM);
43  }
44 
45  if (!c->verify && av_find_info_tag(buf, sizeof(buf), "verify", p)) {
46  char *endptr = NULL;
47  c->verify = strtol(buf, &endptr, 10);
48  if (buf == endptr)
49  c->verify = 1;
50  }
51 
52  if (!c->cert_file && av_find_info_tag(buf, sizeof(buf), "cert", p)) {
53  c->cert_file = av_strdup(buf);
54  if (!c->cert_file)
55  return AVERROR(ENOMEM);
56  }
57 
58  if (!c->key_file && av_find_info_tag(buf, sizeof(buf), "key", p)) {
59  c->key_file = av_strdup(buf);
60  if (!c->key_file)
61  return AVERROR(ENOMEM);
62  }
63 
64  return 0;
65 }
66 
67 int ff_tls_open_underlying(TLSShared *c, URLContext *parent, const char *uri, AVDictionary **options)
68 {
69  int port;
70  const char *p;
71  char buf[200], opts[50] = "";
72  struct addrinfo hints = { 0 }, *ai = NULL;
73  const char *proxy_path;
74  char *env_http_proxy, *env_no_proxy;
75  int use_proxy;
76  int ret;
77 
78  ret = set_options(c, uri);
79  if (ret < 0)
80  return ret;
81 
82  if (c->listen)
83  snprintf(opts, sizeof(opts), "?listen=1");
84 
85  av_url_split(NULL, 0, NULL, 0, c->underlying_host, sizeof(c->underlying_host), &port, NULL, 0, uri);
86 
87  p = strchr(uri, '?');
88 
89  if (!p) {
90  p = opts;
91  } else {
92  if (av_find_info_tag(opts, sizeof(opts), "listen", p))
93  c->listen = 1;
94  }
95 
96  ff_url_join(buf, sizeof(buf), "tcp", NULL, c->underlying_host, port, "%s", p);
97 
98  hints.ai_flags = AI_NUMERICHOST;
99  if (!getaddrinfo(c->underlying_host, NULL, &hints, &ai)) {
100  c->numerichost = 1;
101  freeaddrinfo(ai);
102  }
103 
104  if (!c->host && !(c->host = av_strdup(c->underlying_host)))
105  return AVERROR(ENOMEM);
106 
107  env_http_proxy = getenv_utf8("http_proxy");
108  proxy_path = c->http_proxy ? c->http_proxy : env_http_proxy;
109 
110  env_no_proxy = getenv_utf8("no_proxy");
111  use_proxy = !ff_http_match_no_proxy(env_no_proxy, c->underlying_host) &&
112  proxy_path && av_strstart(proxy_path, "http://", NULL);
113  freeenv_utf8(env_no_proxy);
114 
115  if (use_proxy) {
116  char proxy_host[200], proxy_auth[200], dest[200];
117  int proxy_port;
118  av_url_split(NULL, 0, proxy_auth, sizeof(proxy_auth),
119  proxy_host, sizeof(proxy_host), &proxy_port, NULL, 0,
120  proxy_path);
121  ff_url_join(dest, sizeof(dest), NULL, NULL, c->underlying_host, port, NULL);
122  ff_url_join(buf, sizeof(buf), "httpproxy", proxy_auth, proxy_host,
123  proxy_port, "/%s", dest);
124  }
125 
126  freeenv_utf8(env_http_proxy);
127  return ffurl_open_whitelist(&c->tcp, buf, AVIO_FLAG_READ_WRITE,
128  &parent->interrupt_callback, options,
129  parent->protocol_whitelist, parent->protocol_blacklist, parent);
130 }
AVERROR
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
av_find_info_tag
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:756
AVIO_FLAG_READ_WRITE
#define AVIO_FLAG_READ_WRITE
read-write pseudo flag
Definition: avio.h:619
freeenv_utf8
static void freeenv_utf8(char *var)
Definition: getenv_utf8.h:72
AVDictionary
Definition: dict.c:34
os_support.h
freeaddrinfo
#define freeaddrinfo
Definition: network.h:218
ffurl_open_whitelist
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:362
AI_NUMERICHOST
#define AI_NUMERICHOST
Definition: network.h:187
ff_url_join
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:40
ff_http_match_no_proxy
int ff_http_match_no_proxy(const char *no_proxy, const char *hostname)
Definition: network.c:557
opts
AVDictionary * opts
Definition: movenc.c:51
URLContext::protocol_whitelist
const char * protocol_whitelist
Definition: url.h:46
NULL
#define NULL
Definition: coverity.c:32
URLContext::protocol_blacklist
const char * protocol_blacklist
Definition: url.h:47
parseutils.h
getenv_utf8
static char * getenv_utf8(const char *varname)
Definition: getenv_utf8.h:67
options
Definition: swscale.c:42
set_options
static int set_options(TLSShared *c, const char *uri)
Definition: tls.c:32
c
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
getenv_utf8.h
av_strstart
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:36
getaddrinfo
#define getaddrinfo
Definition: network.h:217
URLContext
Definition: url.h:35
av_url_split
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:351
url.h
ret
ret
Definition: filter_design.txt:187
ff_tls_open_underlying
int ff_tls_open_underlying(TLSShared *c, URLContext *parent, const char *uri, AVDictionary **options)
Definition: tls.c:67
URLContext::interrupt_callback
AVIOInterruptCB interrupt_callback
Definition: url.h:44
avformat.h
network.h
tls.h
addrinfo::ai_flags
int ai_flags
Definition: network.h:138
av_strdup
char * av_strdup(const char *s)
Duplicate a string.
Definition: mem.c:272
mem.h
TLSShared
Definition: tls.h:29
avstring.h
addrinfo
Definition: network.h:137
snprintf
#define snprintf
Definition: snprintf.h:34
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