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nc: Add -n option to suppress name resolution

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Fabian Dellwing 2023-04-14 13:18:56 +02:00 committed by Andrew Kaster
parent 7cfa108fad
commit 8c1dacecba
Notes: sideshowbarker 2024-07-17 01:46:00 +09:00 
Author: https://github.com/fdellwing
Commit: https://github.com/SerenityOS/serenity/commit/8c1dacecba
Pull-request: https://github.com/SerenityOS/serenity/pull/18364
Reviewed-by: https://github.com/ADKaster ✅
Reviewed-by: https://github.com/timschumi
2 changed files with 18 additions and 8 deletions
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3
Base/usr/share/man/man1/nc.md
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@ -5,7 +5,7 @@ nc
## Synopsis
```sh
$ nc [--length ] [--listen] [-N] [--udp] [-p port] [--verbose] [target] [port]
$ nc [--length ] [--listen] [-N] [-n] [--udp] [-p port] [--verbose] [target] [port]
```
## Description
@ -17,6 +17,7 @@ Network cat: Connect to network sockets as if it were a file.
* `-I`, `--length`: Set maximum tcp receive buffer size
* `-l`, `--listen`: Listen instead of connecting
* `-N`: Close connection after reading stdin to the end
* `-n`: Suppress name resolution
* `-u`, `--udp`: UDP mode
* `-p port`: Local port for remote connections
* `-v`, `--verbose`: Log everything that's happening

23
Userland/Utilities/nc.cpp
View file

@ -50,6 +50,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
bool verbose = false;
bool should_close = false;
bool udp_mode = false;
bool numeric_mode = false;
DeprecatedString target;
int port = 0;
int local_port = 0;
@ -60,6 +61,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
args_parser.add_option(maximum_tcp_receive_buffer_size_input, "Set maximum tcp receive buffer size", "length", 'I', nullptr);
args_parser.add_option(should_listen, "Listen instead of connecting", "listen", 'l');
args_parser.add_option(should_close, "Close connection after reading stdin to the end", nullptr, 'N');
args_parser.add_option(numeric_mode, "Suppress name resolution", nullptr, 'n');
args_parser.add_option(udp_mode, "UDP mode", "udp", 'u');
args_parser.add_option(local_port, "Local port for remote connections", nullptr, 'p', "port");
args_parser.add_option(verbose, "Log everything that's happening", "verbose", 'v');
@ -144,16 +146,23 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
TRY(Core::System::setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &timeout, sizeof(timeout)));
TRY(Core::System::setsockopt(fd, SOL_SOCKET, SO_SNDTIMEO, &timeout, sizeof(timeout)));
auto* hostent = gethostbyname(target.characters());
if (!hostent) {
warnln("Socket::connect: Unable to resolve '{}'", target);
return 1;
}
sockaddr_in dst_addr {};
dst_addr.sin_family = AF_INET;
dst_addr.sin_port = htons(port);
dst_addr.sin_addr.s_addr = *(in_addr_t const*)hostent->h_addr_list[0];
if (!numeric_mode) {
auto* hostent = gethostbyname(target.characters());
if (!hostent) {
warnln("nc: Unable to resolve '{}'", target);
return 1;
}
dst_addr.sin_addr.s_addr = *(in_addr_t const*)hostent->h_addr_list[0];
} else {
if (inet_pton(AF_INET, target.characters(), &dst_addr.sin_addr) <= 0) {
perror("inet_pton");
return 1;
}
}
// FIXME: Actually use the local_port for the outgoing connection once we have a working implementation of bind and connect