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// TCP client that sends a few messages to a server and prints out the replies
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <netdb.h>
#ifdef __EMSCRIPTEN__
#include <emscripten.h>
#include <emscripten/websocket.h>
#include <emscripten/threading.h>
#include <emscripten/posix_socket.h>
static EMSCRIPTEN_WEBSOCKET_T bridgeSocket = 0;
#endif
int lookup_host(const char *host) {
struct addrinfo hints, *res;
int errcode;
char addrstr[100];
void *ptr;
memset(&hints, 0, sizeof (hints));
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags |= AI_CANONNAME;
errcode = getaddrinfo(host, NULL, &hints, &res);
if (errcode != 0) {
printf("getaddrinfo failed!\n");
return -1;
}
printf("Host: %s\n", host);
while (res) {
inet_ntop(res->ai_family, res->ai_addr->sa_data, addrstr, 100);
switch (res->ai_family) {
case AF_INET:
ptr = &((struct sockaddr_in *)res->ai_addr)->sin_addr;
break;
case AF_INET6:
ptr = &((struct sockaddr_in6 *)res->ai_addr)->sin6_addr;
break;
}
inet_ntop(res->ai_family, ptr, addrstr, 100);
printf("IPv%d address: %s (%s)\n", res->ai_family == PF_INET6 ? 6 : 4, addrstr, res->ai_canonname);
res = res->ai_next;
}
return 0;
}
int main(int argc , char *argv[]) {
#ifdef __EMSCRIPTEN__
bridgeSocket = emscripten_init_websocket_to_posix_socket_bridge("ws://localhost:8080");
// Synchronously wait until connection has been established.
uint16_t readyState = 0;
do {
emscripten_websocket_get_ready_state(bridgeSocket, &readyState);
emscripten_thread_sleep(100);
} while (readyState == 0);
#endif
lookup_host("google.com");
// Create socket
int sock = socket(AF_INET, SOCK_STREAM, 0);
if (sock == -1) {
printf("Could not create socket");
return 1;
}
printf("Socket created: %d\n", sock);
struct sockaddr_in server;
server.sin_addr.s_addr = inet_addr("127.0.0.1");
server.sin_family = AF_INET;
server.sin_port = htons(7777);
if (connect(sock, (struct sockaddr *)&server, sizeof(server)) < 0) {
perror("connect failed. Error");
return 1;
}
puts("Connected\n");
for (int i = 0; i < 10; ++i) {
const char message[] = "hello world";
if (send(sock, message, strlen(message), 0) < 0) {
puts("Send failed");
return 1;
}
char server_reply[256];
if (recv(sock, server_reply, 256, 0) < 0) {
puts("recv failed");
break;
}
puts("Server reply: ");
puts(server_reply);
// For the purposes of the test assert that the server
// echos back what we send it.
assert(strcmp(server_reply, message) == 0);
}
close(sock);
return 0;
}
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