#include #include #include #include #include #include #include #define PORT 8888 //The port on which to send data #define ADDR "127.0.0.1" //The internet address to send packets to int main(void){ int s; struct sockaddr_in server_addr; char buf[] = "testing 1 2 3\n"; s = socket(AF_INET, SOCK_STREAM, 0); if(s == -1){ err(1, "error creating socket"); } uint8_t options = 1; //noop in the language of ip options if(setsockopt(s, IPPROTO_IP, IP_OPTIONS, &options, 1) == -1){ err(1, "error setting socket options"); } memset(&server_addr, 0, sizeof(server_addr)); server_addr.sin_family = AF_INET; server_addr.sin_port = htons(PORT); if(inet_pton(AF_INET, ADDR, &server_addr.sin_addr) != 1){ // I realize I'm checking the return value differently here. If you read the man page for inet_pton, it'll make sense. err(1, "error converting network address"); } if(connect(s, (struct sockaddr*)&server_addr, sizeof(server_addr)) == -1){ err(1, "error connecting"); } if(send(s, buf, strlen(buf), 0) == -1){ err(1, "error sending data"); } close(s); }