[FFmpeg-devel] [PR] avformat/http: allow adjusting the redirect limit (PR #21458)

[michaelni via ffmpeg-devel <ffmpeg-devel@ffmpeg.org>]

PR #21458 opened by michaelni
URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21458
Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21458.patch

Idea from: BapToutatis and also curl and wget have equivalent options

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>


>From 9dff008ed8c2a3ba73d9d1a23f1660501e20ed8e Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
Date: Wed, 14 Jan 2026 03:21:46 +0100
Subject: [PATCH] avformat/http: allow adjusting the redirect limit

Idea from: BapToutatis and also curl and wget have equivalent options

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavformat/http.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/libavformat/http.c b/libavformat/http.c
index bd25a45636..cb1bd6bc20 100644
--- a/libavformat/http.c
+++ b/libavformat/http.c
@@ -146,6 +146,7 @@ typedef struct HTTPContext {
     unsigned int retry_after;
     int reconnect_max_retries;
     int reconnect_delay_total_max;
+    int max_redirects;
 } HTTPContext;
 
 #define OFFSET(x) offsetof(HTTPContext, x)
@@ -191,6 +192,7 @@ static const AVOption options[] = {
     { "resource", "The resource requested by a client", OFFSET(resource), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, E },
     { "reply_code", "The http status code to return to a client", OFFSET(reply_code), AV_OPT_TYPE_INT, { .i64 = 200}, INT_MIN, 599, E},
     { "short_seek_size", "Threshold to favor readahead over seek.", OFFSET(short_seek_size), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, D },
+    { "max_redirects", "Maximum number of redirects", OFFSET(max_redirects), AV_OPT_TYPE_INT, { .i64 = MAX_REDIRECTS }, 0, INT_MAX, D },
     { NULL }
 };
 
@@ -384,6 +386,9 @@ redo:
 
     cached = redirect_cache_get(s);
     if (cached) {
+        if (redirects++ >= s->max_redirects)
+            return AVERROR(EIO);
+
         av_free(s->location);
         s->location = av_strdup(cached);
         if (!s->location) {
@@ -452,7 +457,7 @@ redo:
         s->new_location) {
         /* url moved, get next */
         ffurl_closep(&s->hd);
-        if (redirects++ >= MAX_REDIRECTS)
+        if (redirects++ >= s->max_redirects)
             return AVERROR(EIO);
 
         if (!s->expires) {
-- 
2.49.1

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