FFmpeg: libavformat/tls.c Source File

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libavformat

tls.c

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1 /*

2 * TLS/SSL Protocol

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 */

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"

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;

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 }

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 }

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 }

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 }

64 return 0;

65 }

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;

78 ret = set_options(c, uri);

79 if (ret < 0)

80 return ret;

82 if (c->listen)

83 snprintf(opts, sizeof(opts), "?listen=1");

85 av_url_split(NULL, 0, NULL, 0, c->underlying_host, sizeof(c->underlying_host), &port, NULL, 0, uri);

87 p = strchr(uri, '?');

89 if (!p) {

90 p = opts;

91 } else {

92 if (av_find_info_tag(opts, sizeof(opts), "listen", p))

93 c->listen = 1;

94 }

96 ff_url_join(buf, sizeof(buf), "tcp", NULL, c->underlying_host, port, "%s", p);

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:753

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

set_options

static int set_options(TLSShared *c, const char *uri)

Definition: tls.c:32

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

options

const OptionDef options[]

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

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