mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-11-26 09:30:24 +00:00
Userland: Implement -l, -v, -N, -s, and -p for netcat
This commit is contained in:
Conrad Pankoff
Andreas Kling
parent
fbcf51f81b
commit
fffd3a67ad
Notes:
sideshowbarker
2024-07-19 12:49:28 +09:00
Author: https://github.com/deoxxa Commit: https://github.com/SerenityOS/serenity/commit/fffd3a67ade Pull-request: https://github.com/SerenityOS/serenity/pull/420 Reviewed-by: https://github.com/awesomekling ✅
1 changed files with 170 additions and 56 deletions
226
Userland/nc.cpp
226
Userland/nc.cpp
|
|
@ -1,4 +1,6 @@
|
|||
#include <arpa/inet.h>
|
||||
#include <errno.h>
|
||||
#include <getopt.h>
|
||||
#include <netinet/in.h>
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
|
|
@ -11,68 +13,174 @@
|
|||
|
||||
#define max(a, b) ((a > b) ? a : b)
|
||||
|
||||
void exit_with_usage(int rc)
|
||||
{
|
||||
fprintf(stderr, "Usage: nc [-l] [-v] [-h] [-N] [-s source] [-p source_port] [destination] [port]\n");
|
||||
exit(rc);
|
||||
}
|
||||
|
||||
int main(int argc, char** argv)
|
||||
{
|
||||
if (argc < 3) {
|
||||
fprintf(stderr, "Usage: nc <host> <port>\n");
|
||||
return -1;
|
||||
bool should_listen = false;
|
||||
bool verbose = false;
|
||||
char *source_addr = nullptr;
|
||||
int source_port = 0;
|
||||
bool should_close = false;
|
||||
|
||||
int opt;
|
||||
while ((opt = getopt(argc, argv, "hlvs:p:N")) != -1) {
|
||||
switch (opt) {
|
||||
case 'h':
|
||||
exit_with_usage(0);
|
||||
break;
|
||||
case 'l':
|
||||
should_listen = true;
|
||||
break;
|
||||
case 'v':
|
||||
verbose = true;
|
||||
break;
|
||||
case 's':
|
||||
source_addr = strdup(optarg);
|
||||
break;
|
||||
case 'p':
|
||||
source_port = atoi(optarg);
|
||||
break;
|
||||
case 'N':
|
||||
should_close = true;
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
const char* addr_str = argv[1];
|
||||
int port = atoi(argv[2]);
|
||||
int fd;
|
||||
|
||||
int fd = socket(AF_INET, SOCK_STREAM, 0);
|
||||
if (fd < 0) {
|
||||
perror("socket");
|
||||
return 1;
|
||||
if (should_listen) {
|
||||
int listen_fd = socket(AF_INET, SOCK_STREAM, 0);
|
||||
if (listen_fd < 0) {
|
||||
perror("socket");
|
||||
return 1;
|
||||
}
|
||||
|
||||
struct sockaddr_in sa;
|
||||
memset(&sa, 0, sizeof sa);
|
||||
sa.sin_family = AF_INET;
|
||||
sa.sin_port = htons(source_port);
|
||||
sa.sin_addr.s_addr = htonl(INADDR_ANY);
|
||||
if (source_addr) {
|
||||
if (inet_pton(AF_INET, source_addr, &sa.sin_addr) < 0) {
|
||||
perror("inet_pton");
|
||||
return 1;
|
||||
}
|
||||
}
|
||||
|
||||
if (bind(listen_fd, (struct sockaddr*)&sa, sizeof(sa)) == -1) {
|
||||
perror("bind");
|
||||
return 1;
|
||||
}
|
||||
|
||||
if (listen(listen_fd, 1) == -1) {
|
||||
perror("listen");
|
||||
return 1;
|
||||
}
|
||||
|
||||
char addr_str[100];
|
||||
|
||||
struct sockaddr_in sin;
|
||||
socklen_t len = sizeof(sin);
|
||||
|
||||
if (getsockname(listen_fd, (struct sockaddr*)&sin, &len) == -1) {
|
||||
perror("getsockname");
|
||||
return 1;
|
||||
}
|
||||
if (verbose)
|
||||
fprintf(stderr, "waiting for a connection on %s:%d\n", inet_ntop(sin.sin_family, &sin.sin_addr, addr_str, sizeof(addr_str) - 1), ntohs(sin.sin_port));
|
||||
|
||||
fd = accept(listen_fd, (struct sockaddr*)&sin, &len);
|
||||
if (fd == -1) {
|
||||
perror("accept");
|
||||
return 1;
|
||||
}
|
||||
|
||||
if (verbose)
|
||||
fprintf(stderr, "got connection from %s:%d\n", inet_ntop(sin.sin_family, &sin.sin_addr, addr_str, sizeof(addr_str) - 1), ntohs(sin.sin_port));
|
||||
|
||||
if (close(listen_fd) == -1) {
|
||||
perror("close");
|
||||
return 1;
|
||||
};
|
||||
} else {
|
||||
if ((argc - optind) < 2) {
|
||||
exit_with_usage(-1);
|
||||
}
|
||||
|
||||
const char* addr_arg = argv[optind];
|
||||
int port_arg = atoi(argv[optind + 1]);
|
||||
if (port_arg < 0) {
|
||||
perror("atoi");
|
||||
return 1;
|
||||
}
|
||||
|
||||
fd = socket(AF_INET, SOCK_STREAM, 0);
|
||||
if (fd < 0) {
|
||||
perror("socket");
|
||||
return 1;
|
||||
}
|
||||
|
||||
struct timeval timeout {
|
||||
3, 0
|
||||
};
|
||||
if (setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &timeout, sizeof(timeout)) < 0) {
|
||||
perror("setsockopt");
|
||||
return 1;
|
||||
}
|
||||
if (setsockopt(fd, SOL_SOCKET, SO_SNDTIMEO, &timeout, sizeof(timeout)) < 0) {
|
||||
perror("setsockopt");
|
||||
return 1;
|
||||
}
|
||||
|
||||
char addr_str[100];
|
||||
|
||||
struct sockaddr_in dst_addr;
|
||||
memset(&dst_addr, 0, sizeof(dst_addr));
|
||||
|
||||
dst_addr.sin_family = AF_INET;
|
||||
dst_addr.sin_port = htons(port_arg);
|
||||
if (inet_pton(AF_INET, addr_arg, &dst_addr.sin_addr) < 0) {
|
||||
perror("inet_pton");
|
||||
return 1;
|
||||
}
|
||||
|
||||
if (verbose)
|
||||
fprintf(stderr, "connecting to %s:%d\n", inet_ntop(dst_addr.sin_family, &dst_addr.sin_addr, addr_str, sizeof(addr_str) - 1), ntohs(dst_addr.sin_port));
|
||||
if (connect(fd, (struct sockaddr*)&dst_addr, sizeof(dst_addr)) < 0) {
|
||||
perror("connect");
|
||||
return 1;
|
||||
}
|
||||
if (verbose)
|
||||
fprintf(stderr, "connected!\n");
|
||||
}
|
||||
|
||||
struct timeval timeout {
|
||||
3, 0
|
||||
};
|
||||
int rc = setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &timeout, sizeof(timeout));
|
||||
if (rc < 0) {
|
||||
perror("setsockopt");
|
||||
return 1;
|
||||
}
|
||||
rc = setsockopt(fd, SOL_SOCKET, SO_SNDTIMEO, &timeout, sizeof(timeout));
|
||||
if (rc < 0) {
|
||||
perror("setsockopt");
|
||||
return 1;
|
||||
}
|
||||
|
||||
struct sockaddr_in dst_addr;
|
||||
memset(&dst_addr, 0, sizeof(dst_addr));
|
||||
|
||||
dst_addr.sin_family = AF_INET;
|
||||
dst_addr.sin_port = htons(port);
|
||||
rc = inet_pton(AF_INET, addr_str, &dst_addr.sin_addr);
|
||||
if (rc <= 0) {
|
||||
perror("inet_pton");
|
||||
return 1;
|
||||
}
|
||||
|
||||
rc = connect(fd, (struct sockaddr*)&dst_addr, sizeof(dst_addr));
|
||||
if (rc < 0) {
|
||||
perror("connect");
|
||||
return 1;
|
||||
}
|
||||
bool stdin_closed = false;
|
||||
bool fd_closed = false;
|
||||
|
||||
fd_set readfds, writefds, exceptfds;
|
||||
|
||||
for (;;) {
|
||||
while (!stdin_closed || !fd_closed) {
|
||||
FD_ZERO(&readfds);
|
||||
FD_ZERO(&writefds);
|
||||
FD_ZERO(&exceptfds);
|
||||
|
||||
int highest_fd = 0;
|
||||
|
||||
FD_SET(STDIN_FILENO, &readfds);
|
||||
FD_SET(STDIN_FILENO, &exceptfds);
|
||||
highest_fd = max(highest_fd, STDIN_FILENO);
|
||||
FD_SET(fd, &readfds);
|
||||
FD_SET(fd, &exceptfds);
|
||||
highest_fd = max(highest_fd, fd);
|
||||
if (!stdin_closed) {
|
||||
FD_SET(STDIN_FILENO, &readfds);
|
||||
FD_SET(STDIN_FILENO, &exceptfds);
|
||||
highest_fd = max(highest_fd, STDIN_FILENO);
|
||||
}
|
||||
if (!fd_closed) {
|
||||
FD_SET(fd, &readfds);
|
||||
FD_SET(fd, &exceptfds);
|
||||
highest_fd = max(highest_fd, fd);
|
||||
}
|
||||
|
||||
int ready = select(highest_fd + 1, &readfds, &writefds, &exceptfds, NULL);
|
||||
if (ready == -1) {
|
||||
|
|
@ -83,7 +191,7 @@ int main(int argc, char** argv)
|
|||
return 1;
|
||||
}
|
||||
|
||||
if (FD_ISSET(STDIN_FILENO, &readfds)) {
|
||||
if (!stdin_closed && FD_ISSET(STDIN_FILENO, &readfds)) {
|
||||
char buf[1024];
|
||||
int nread = read(STDIN_FILENO, buf, sizeof(buf));
|
||||
if (nread < 0) {
|
||||
|
|
@ -93,16 +201,20 @@ int main(int argc, char** argv)
|
|||
|
||||
// stdin closed
|
||||
if (nread == 0) {
|
||||
return 0;
|
||||
}
|
||||
|
||||
if (write(fd, buf, nread) < 0) {
|
||||
stdin_closed = true;
|
||||
if (verbose)
|
||||
fprintf(stderr, "stdin closed\n");
|
||||
if (should_close) {
|
||||
close(fd);
|
||||
fd_closed = true;
|
||||
}
|
||||
} else if (write(fd, buf, nread) < 0) {
|
||||
perror("write(fd)");
|
||||
return 1;
|
||||
}
|
||||
}
|
||||
|
||||
if (FD_ISSET(fd, &readfds)) {
|
||||
if (!fd_closed && FD_ISSET(fd, &readfds)) {
|
||||
char buf[1024];
|
||||
int nread = read(fd, buf, sizeof(buf));
|
||||
if (nread < 0) {
|
||||
|
|
@ -112,10 +224,12 @@ int main(int argc, char** argv)
|
|||
|
||||
// remote end closed
|
||||
if (nread == 0) {
|
||||
return 0;
|
||||
}
|
||||
|
||||
if (write(STDOUT_FILENO, buf, nread) < 0) {
|
||||
close(STDIN_FILENO);
|
||||
stdin_closed = true;
|
||||
fd_closed = true;
|
||||
if (verbose)
|
||||
fprintf(stderr, "remote closed\n");
|
||||
} else if (write(STDOUT_FILENO, buf, nread) < 0) {
|
||||
perror("write(STDOUT_FILENO)");
|
||||
return 1;
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue