[FFmpeg-devel] [PATCH v2] avformat/http, tls: honor http_proxy command line variable for HTTPS

[Moritz Barsnick]

Patch version 2 attached, with added documentation.

Moritz
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From 2f2a43e4c684cd4bfda420bbedf5125dd78b3b34 Mon Sep 17 00:00:00 2001
From: Moritz Barsnick <barsnick at gmx.net>
Date: Thu, 20 Aug 2020 17:49:14 +0200
Subject: [PATCH] avformat/http,tls: honor http_proxy command line variable for
 HTTPS

Add the "http_proxy" option and its handling to the "tls" protocol,
pass the option from the "https" protocol.

The "https" protocol already defines the "http_proxy" command line
option, like the "http" protocol does. The "http" protocol properly
honors that command line option in addition to the environment
variable. The "https" protocol doesn't, because the proxy is
evaluated in the underlying "tls" protocol, which doesn't have this
option, and thus only handles the environment variable, which it
has access to.

Fixes #7223.

Signed-off-by: Moritz Barsnick <barsnick at gmx.net>
---
 doc/protocols.texi | 4 ++++
 libavformat/http.c | 6 ++++++
 libavformat/tls.c  | 2 +-
 libavformat/tls.h  | 2 ++
 4 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/doc/protocols.texi b/doc/protocols.texi
index 7b3df96fda..603943023c 100644
--- a/doc/protocols.texi
+++ b/doc/protocols.texi
@@ -1708,6 +1708,10 @@ A file containing the private key for the certificate.
 If enabled, listen for connections on the provided port, and assume
 the server role in the handshake instead of the client role.

+ at item http_proxy
+The HTTP proxy to tunnel through, e.g. @code{http://example.com:1234}.
+The proxy must support the CONNECT method.
+
 @end table

 Example command lines:
diff --git a/libavformat/http.c b/libavformat/http.c
index 6c39da1a8b..21584bdce9 100644
--- a/libavformat/http.c
+++ b/libavformat/http.c
@@ -213,6 +213,12 @@ static int http_open_cnx_internal(URLContext *h, AVDictionary **options)
         use_proxy   = 0;
         if (port < 0)
             port = 443;
+        /* pass http_proxy to underlying protocol */
+        if (s->http_proxy) {
+            err = av_dict_set(options, "http_proxy", s->http_proxy, 0);
+            if (err < 0)
+                return err;
+        }
     }
     if (port < 0)
         port = 80;
diff --git a/libavformat/tls.c b/libavformat/tls.c
index 10e0792e29..302c0f8d59 100644
--- a/libavformat/tls.c
+++ b/libavformat/tls.c
@@ -89,7 +89,7 @@ int ff_tls_open_underlying(TLSShared *c, URLContext *parent, const char *uri, AV
     if (!c->host && !(c->host = av_strdup(c->underlying_host)))
         return AVERROR(ENOMEM);

-    proxy_path = getenv("http_proxy");
+    proxy_path = c->http_proxy ? c->http_proxy : getenv("http_proxy");
     use_proxy = !ff_http_match_no_proxy(getenv("no_proxy"), c->underlying_host) &&
                 proxy_path && av_strstart(proxy_path, "http://", NULL);

diff --git a/libavformat/tls.h b/libavformat/tls.h
index beb19d6d55..0c52ff3be6 100644
--- a/libavformat/tls.h
+++ b/libavformat/tls.h
@@ -34,6 +34,7 @@ typedef struct TLSShared {
     int listen;

     char *host;
+    char *http_proxy;

     char underlying_host[200];
     int numerichost;
@@ -49,6 +50,7 @@ typedef struct TLSShared {
     {"cert_file",  "Certificate file",                    offsetof(pstruct, options_field . cert_file), AV_OPT_TYPE_STRING, .flags = TLS_OPTFL }, \
     {"key_file",   "Private key file",                    offsetof(pstruct, options_field . key_file),  AV_OPT_TYPE_STRING, .flags = TLS_OPTFL }, \
     {"listen",     "Listen for incoming connections",     offsetof(pstruct, options_field . listen),    AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, .flags = TLS_OPTFL }, \
+    {"http_proxy", "set proxy to tunnel through when using HTTPS", offsetof(pstruct, options_field . http_proxy), AV_OPT_TYPE_STRING, .flags = TLS_OPTFL }, \
     {"verifyhost", "Verify against a specific hostname",  offsetof(pstruct, options_field . host),      AV_OPT_TYPE_STRING, .flags = TLS_OPTFL }

 int ff_tls_open_underlying(TLSShared *c, URLContext *parent, const char *uri, AVDictionary **options);
--
2.26.2