[Privoxy-commits] [privoxy] 08/16: get_destination_from_https_headers(): Properly handle IPv6 addresses

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commit 97316c794f7b3ef676e1299a3b41c1ac80f07101
Author: Fabian Keil <fk at fabiankeil.de>
AuthorDate: Thu Sep 11 14:37:38 2025 +0200

    get_destination_from_https_headers(): Properly handle IPv6 addresses
---
 parsers.c | 30 +++++++++++++++++++++++++++++-
 1 file changed, 29 insertions(+), 1 deletion(-)

diff --git a/parsers.c b/parsers.c
index 1b7e2de2..2ab405fa 100644
--- a/parsers.c
+++ b/parsers.c
@@ -5040,7 +5040,35 @@ jb_err get_destination_from_https_headers(const struct list *headers, struct htt
    http->hostport = p;
    freez(http->host);
    http->host = q;
-   q = strchr(http->host, ':');
+   if (*p == '[')
+   {
+      /* Numeric IPv6 address delimited by brackets */
+      p++;
+
+      q = strchr(p, ']');
+      if (q == NULL)
+      {
+         /* Missing closing bracket */
+         return JB_ERR_PARSE;
+      }
+
+      *q++ = '\0';
+
+      if (*q == '\0')
+      {
+         q = NULL;
+      }
+      else if (*q != ':')
+      {
+         /* Garbage after closing bracket */
+         return JB_ERR_PARSE;
+      }
+   }
+   else
+   {
+      /* Plain non-escaped hostname */
+      q = strchr(http->host, ':');
+   }
    if (q != NULL)
    {
       /* Terminate hostname and evaluate port string */

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