71 lines
2.1 KiB
C
71 lines
2.1 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include "Practical.h"
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int main(int argc, char **argv) {
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if (argc < 3 || argc > 4) {
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DieWithUserMessage("Parameter(s)", "<Server Address> <Echo Word> [<Server Port>]");
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}
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const char *server_ip = argv[1];
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const char *echo_str = argv[2];
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const in_port_t server_port = (argc == 4) ? atoi(argv[3]) : 7; // 7: common echo port
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const int sock = socket(AF_INET, SOCK_STREAM, proto_get_num("tcp"));
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if (sock < 0) {
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DieWithSystemMessage("socket() failed");
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}
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struct sockaddr_in server_addr = {0};
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server_addr.sin_family = AF_INET;
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int ret_val = inet_pton(AF_INET, server_ip, &server_addr.sin_addr.s_addr);
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if (ret_val == 0) {
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DieWithUserMessage("inet_pton() failed", "invalid address string");
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} else if (ret_val < 0) {
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DieWithSystemMessage("inet_pton() failed");
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}
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server_addr.sin_port = htons(server_port);
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if (connect(sock, (struct sockaddr *) &server_addr, sizeof(server_addr)) < 0) {
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DieWithSystemMessage("connect() failed");
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}
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const size_t echo_str_len = strlen(echo_str);
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ssize_t num_bytes = send(sock, echo_str, echo_str_len, 0);
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if (num_bytes < 0) {
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DieWithSystemMessage("send() failed");
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} else if ((size_t) num_bytes != echo_str_len) {
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DieWithUserMessage("send()", "sent unexpected number of bytes");
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}
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unsigned int total_bytes_rcvd = 0;
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fputs("Received: ", stdout);
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while (total_bytes_rcvd < echo_str_len) {
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char buffer[BUFSIZE];
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num_bytes = recv(sock, buffer, BUFSIZE - 1, 0);
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if (num_bytes < 0) {
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DieWithSystemMessage("recv() failed");
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} else if (num_bytes == 0) {
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DieWithUserMessage("recv()", "connection closed prematurely");
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}
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total_bytes_rcvd += num_bytes;
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buffer[num_bytes] = '\0';
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fputs(buffer, stdout);
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}
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fputc('\n', stdout);
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close(sock);
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return 0;
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}
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