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Userland: Treat inet_pton returning 0 as an error

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The POSIX man-page states that inet_pton returns 0 if the input is not a
valid IPv4 dotted-decimal string or a valid IPv6 address string. This is
also how it is implemented in SerenityOS.

This means that we should treat a return value of 0 as an error to avoid
using an invalid address (or 0.0.0.0).
This commit is contained in:
Tim Schumacher 2021-05-27 16:08:05 +02:00 committed by Andreas Kling
parent f7667901ed
commit d7797c8bf8
Notes: sideshowbarker 2024-07-18 17:17:35 +09:00 
Author: https://github.com/timschumi
Commit: https://github.com/SerenityOS/serenity/commit/d7797c8bf88
Pull-request: https://github.com/SerenityOS/serenity/pull/7503
2 changed files with 2 additions and 2 deletions
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2
Userland/Libraries/LibC/arpa/inet.cpp
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@ -62,7 +62,7 @@ in_addr_t inet_addr(const char* str)
{
in_addr_t tmp {};
int rc = inet_pton(AF_INET, str, &tmp);
if (rc < 0)
if (rc <= 0)
return INADDR_NONE;
return tmp;
}

2
Userland/Utilities/nc.cpp
View file

@ -87,7 +87,7 @@ int main(int argc, char** argv)
sa.sin_port = htons(port);
sa.sin_addr.s_addr = htonl(INADDR_ANY);
if (target) {
if (inet_pton(AF_INET, target, &sa.sin_addr) < 0) {
if (inet_pton(AF_INET, target, &sa.sin_addr) <= 0) {
perror("inet_pton");
return 1;
}