From 4a333c88d7fcec8764c2b485f983a86fec534821 Mon Sep 17 00:00:00 2001 From: Stefano Brivio Date: Wed, 24 Jul 2024 23:43:14 +0200 Subject: [PATCH] conf: Accept addresses enclosed by square brackets in port forwarding specifiers Even though we don't use : as delimiter for the port, making square brackets unneeded, RFC 3986, section 3.2.2, mandates them for IPv6 literals. We want IPv6 addresses there, but some users might still specify them out of habit. Same for IPv4 addresses: RFC 3986 doesn't specify square brackets for IPv4 literals, but I had reports of users actually trying to use them (they're accepted by many tools). Allow square brackets for both IPv4 and IPv6 addresses, correct or not, they're harmless anyway. Signed-off-by: Stefano Brivio Reviewed-by: David Gibson --- conf.c | 24 +++++++++++++++++------- 1 file changed, 17 insertions(+), 7 deletions(-) diff --git a/conf.c b/conf.c index 3cf9ed8..46fcd91 100644 --- a/conf.c +++ b/conf.c @@ -209,14 +209,24 @@ static void conf_ports(const struct ctx *c, char optname, const char *optarg, } - if (ifname == buf + 1) /* Interface without address */ + if (ifname == buf + 1) { /* Interface without address */ addr = NULL; - else if (inet_pton(AF_INET, buf, addr)) - af = AF_INET; - else if (inet_pton(AF_INET6, buf, addr)) - af = AF_INET6; - else - goto bad; + } else { + p = buf; + + /* Allow square brackets for IPv4 too for convenience */ + if (*p == '[' && p[strlen(p) - 1] == ']') { + p[strlen(p) - 1] = '\0'; + p++; + } + + if (inet_pton(AF_INET, p, addr)) + af = AF_INET; + else if (inet_pton(AF_INET6, p, addr)) + af = AF_INET6; + else + goto bad; + } } else { spec = buf;