72 lines
1.8 KiB
C
72 lines
1.8 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.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 <netdb.h>
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void error(char *msg) {
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perror(msg);
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exit(0);
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}
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int main(int argc, char *argv[]) {
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int sockfd, portno, n;
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struct sockaddr_in6 serv_addr;
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struct hostent *server;
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char buffer[256] = "This is a string from client!";
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if (argc < 3) {
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fprintf(stderr, "Usage: %s \n", argv[0]);
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exit(0);
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}
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portno = atoi(argv[2]);
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printf("\nIPv6 TCP Client Started...\n");
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//Sockets Layer Call: socket()
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sockfd = socket(AF_INET6, SOCK_STREAM, 0);
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if (sockfd < 0)
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error("ERROR opening socket");
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//Sockets Layer Call: gethostbyname2()
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server = gethostbyname2(argv[1],AF_INET6);
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if (server == NULL) {
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fprintf(stderr, "ERROR, no such host\n");
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exit(0);
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}
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memset((char *) &serv_addr, 0, sizeof(serv_addr));
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serv_addr.sin6_flowinfo = 0;
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serv_addr.sin6_family = AF_INET6;
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memmove((char *) &serv_addr.sin6_addr.s6_addr, (char *) server->h_addr, server->h_length);
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serv_addr.sin6_port = htons(portno);
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//Sockets Layer Call: connect()
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if (connect(sockfd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0)
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error("ERROR connecting");
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//Sockets Layer Call: send()
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n = send(sockfd,buffer, strlen(buffer)+1, 0);
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if (n < 0)
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error("ERROR writing to socket");
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printf("sent %d bytes\n", n);
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memset(buffer, 0, 256);
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//Sockets Layer Call: recv()
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printf("reading...\n");
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n = recv(sockfd, buffer, 255, 0);
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if (n < 0)
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error("ERROR reading from socket");
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printf("Message from server: %s\n", buffer);
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//Sockets Layer Call: close()
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close(sockfd);
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return 0;
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} |