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| #include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <assert.h>
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <fcntl.h>
#include <stdlib.h>
int main(int argc, char* argv[])
{
if (argc <= 2)
{
printf("usage: %s ip_address port_number\n", basename(argv[0]));
return 1;
}
const char* ip = argv[1];
int port = atoi(argv[2]);
printf("ip is %s and port is %d\n", ip, port);
int ret = 0;
struct sockaddr_in address;
bzero(&address, sizeof(address));
address.sin_family = AF_INET;
inet_pton(AF_INET, ip, &address.sin_addr);
address.sin_port = htons(port);
int listenfd = socket(PF_INET, SOCK_STREAM, 0);
assert(listenfd >= 0);
ret = bind(listenfd, (struct sockaddr*)&address, sizeof(address));
assert(ret != -1);
ret = listen(listenfd, 5);
assert(ret != -1);
struct sockaddr_in client_address;
socklen_t client_addrlength = sizeof(client_address);
int connfd = accept(listenfd, (struct sockaddr*)&client_address, &client_addrlength);
if (connfd < 0)
{
printf("errno is: %d\n", errno);
close(listenfd);
}
char remote_addr[INET_ADDRSTRLEN];
printf("connected with ip: %s and port: %d\n", inet_ntop(AF_INET, &client_address.sin_addr, remote_addr, INET_ADDRSTRLEN), ntohs(client_address.sin_port));
char buf[1024];
fd_set read_fds;
fd_set exception_fds;
FD_ZERO(&read_fds);
FD_ZERO(&exception_fds);
int nReuseAddr = 1;
setsockopt(connfd, SOL_SOCKET, SO_OOBINLINE, &nReuseAddr, sizeof(nReuseAddr));
while (1)
{
memset(buf, '\0', sizeof(buf));
FD_SET(connfd, &read_fds);
FD_SET(connfd, &exception_fds);
ret = select(connfd + 1, &read_fds, NULL, &exception_fds, NULL);
printf("select one\n");
if (ret < 0)
{
printf("selection failure\n");
break;
}
if (FD_ISSET(connfd, &read_fds))
{
ret = recv(connfd, buf, sizeof(buf) - 1, 0);
if (ret <= 0)
{
break;
}
printf("get %d bytes of normal data: %s\n", ret, buf);
}
else if (FD_ISSET(connfd, &exception_fds))
{
ret = recv(connfd, buf, sizeof(buf) - 1, MSG_OOB);
if (ret <= 0)
{
break;
}
printf("get %d bytes of oob data: %s\n", ret, buf);
}
}
close(connfd);
close(listenfd);
return 0;
}
|