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#ifndef NET_H_
#define NET_H_
#include <arpa/inet.h>
#include <netinet/tcp.h>
int sock_server(const char *ip, int port);
int sock_accept(int serv_sock);
int sock_connect(const char *ip, int port);
int sock_server(const char *ip, int port){
struct sockaddr_in addr;
memset(&addr, sizeof(addr), 0);
addr.sin_family = AF_INET;
addr.sin_port = htons((short)port);
inet_pton(AF_INET, ip, &addr.sin_addr);
int serv_sock = 0;
if((serv_sock = socket(AF_INET, SOCK_STREAM, 0)) == -1){
goto sock_err;
}
int opt = 1;
if(setsockopt(serv_sock, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) == -1){
goto sock_err;
}
if(bind(serv_sock, (struct sockaddr *)&addr, sizeof(addr)) == -1){
goto sock_err;
}
if(listen(serv_sock, 1024) == -1){
goto sock_err;
}
return serv_sock;
sock_err:
if(serv_sock){
close(serv_sock);
}
return -1;
}
int sock_accept(int serv_sock){
struct sockaddr_in addr;
socklen_t addrlen = sizeof(addr);
int sock = accept(serv_sock, (struct sockaddr *)&addr, &addrlen);
if(sock == -1){
return -1;
}
char remote_ip[INET_ADDRSTRLEN];
inet_ntop(AF_INET, &addr.sin_addr, remote_ip, sizeof(remote_ip));
int remote_port = ntohs(addr.sin_port);
printf("accept client from %s:%d\n", remote_ip, remote_port);
int opt = 1;
setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, (void *)&opt, sizeof(opt));
return sock;
}
int sock_connect(const char *ip, int port){
int sock;
struct sockaddr_in addr;
bzero(&addr, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_port = htons((short)port);
inet_pton(AF_INET, ip, &addr.sin_addr);
if((sock = socket(AF_INET, SOCK_STREAM, 0)) == -1){
goto sock_err;
}
if(connect(sock, (struct sockaddr *)&addr, sizeof(addr)) == -1){
goto sock_err;
}
return sock;
sock_err:
if(sock){
close(sock);
}
return -1;
}
#endif
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