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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <fcntl.h>
int main(int argc, char **argv) {
char *addr;
int port;
int sock;
struct sockaddr_in saddr;
const struct linger nolinger = { .l_onoff = 1, .l_linger = 0 };
if (argc < 4) {
fprintf(stderr,
"usage : %s <addr> <port> <string>\n"
" This will connect to TCP port <addr>:<port> and send string <string>\n"
" then immediately reset.\n",
argv[0]);
exit(1);
}
addr = argv[1];
port = atoi(argv[2]);
sock = socket(AF_INET, SOCK_STREAM, 0);
bzero(&saddr, sizeof(saddr));
saddr.sin_addr.s_addr = inet_addr(addr);
saddr.sin_port = htons(port);
saddr.sin_family = AF_INET;
if (connect(sock, (struct sockaddr *)&saddr, sizeof(saddr)) < 0) {
perror("connect");
exit(1);
}
send(sock, argv[3], strlen(argv[3]), MSG_DONTWAIT | MSG_NOSIGNAL);
setsockopt(sock, SOL_SOCKET, SO_LINGER, (struct linger *) &nolinger, sizeof(struct linger));
close(sock);
exit(0);
}
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