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54 lines
1.4 KiB
54 lines
1.4 KiB
6 months ago
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/* code from http://www.cs.rpi.edu/~moorthy/Courses/os98/Pgms/socket.html */
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#include <stdio.h>
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#include <stdlib.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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#include <string.h>
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#include <unistd.h>
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void
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error(char *msg)
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{
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perror(msg);
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exit(0);
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}
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int
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main(int argc, char *argv[])
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{
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int sockfd, portno, n;
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struct sockaddr_in serv_addr;
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struct hostent * server;
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char buffer[256] = "The quick brown fox jumps over the lazy dog";
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if (argc < 3) {
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fprintf(stderr, "usage %s hostname port\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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sockfd = socket(AF_INET, SOCK_STREAM, 0);
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if (sockfd < 0) error("ERROR opening socket");
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server = gethostbyname(argv[1]);
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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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bzero((char *)&serv_addr, sizeof(serv_addr));
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serv_addr.sin_family = AF_INET;
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bcopy((char *)server->h_addr, (char *)&serv_addr.sin_addr.s_addr, server->h_length);
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serv_addr.sin_port = htons(portno);
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if (connect(sockfd, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0) error("ERROR connecting");
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printf("Sending message %s\n", buffer);
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n = send(sockfd, buffer, strlen(buffer), 0);
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if (n < 0) error("ERROR writing to socket");
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bzero(buffer, 256);
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n = recv(sockfd, buffer, 255, 0);
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if (n < 0) error("ERROR reading from socket");
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printf("%s\n", buffer);
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close(sockfd);
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return 0;
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}
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