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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#ifndef MSG_FASTOPEN
# define MSG_FASTOPEN 0x20000000
#endif
void error(const char *msg)
{
perror(msg);
exit(1);
}
int main(int argc, char *argv[])
{
if (argc < 4) {
printf("Usage: %s host port method(connect or sendto)\n", argv[0]);
return 1;
}
const char *hostname = argv[1];
const int portno = atoi(argv[2]);
const char *method = argv[3];
char request[BUFSIZ];
sprintf(request, "GET / HTTP/1.0\r\nHost: %s\r\n\r\n", hostname);
int sockfd, n;
struct sockaddr_in serv_addr;
struct hostent *server;
char buffer[BUFSIZ];
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0) error("ERROR opening socket");
server = gethostbyname(hostname);
if (server == NULL) {
fprintf(stderr, "%s: no such host\n", hostname);
return 1;
}
memset(&serv_addr, 0, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
memcpy(&serv_addr.sin_addr.s_addr, server->h_addr, server->h_length);
serv_addr.sin_port = htons(portno);
if (!strcmp(method, "connect")) {
if (connect(sockfd, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0)
error("connect");
n = send(sockfd, request, strlen(request), 0);
} else if (!strcmp(method, "sendto")) {
n = sendto(sockfd, request, strlen(request), MSG_FASTOPEN, (struct sockaddr *)&serv_addr, sizeof(serv_addr));
} else {
printf("Unknown method %s\n", method);
return 1;
}
if (n < 0)
error("send");
memset(buffer, 0, BUFSIZ);
n = read(sockfd, buffer, BUFSIZ - 1);
if (n < 0)
error("ERROR reading from socket");
printf("%s\n", buffer);
close(sockfd);
return 0;
}
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