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50 lines
1.4 KiB
50 lines
1.4 KiB
/* A simple server in the internet domain using TCP
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The port number is passed as an argument */
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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 <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.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(1);
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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, newsockfd, portno, clilen;
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char buffer[256];
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struct sockaddr_in serv_addr, cli_addr;
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int n;
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if (argc < 2) {
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fprintf(stderr, "ERROR, no port provided\n");
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exit(1);
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}
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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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bzero((char *)&serv_addr, sizeof(serv_addr));
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portno = atoi(argv[1]);
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serv_addr.sin_family = AF_INET;
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serv_addr.sin_addr.s_addr = INADDR_ANY;
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serv_addr.sin_port = htons(portno);
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if (bind(sockfd, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0) error("ERROR on binding");
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listen(sockfd, 5);
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clilen = sizeof(cli_addr);
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newsockfd = accept(sockfd, (struct sockaddr *)&cli_addr, &clilen);
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if (newsockfd < 0) error("ERROR on accept");
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bzero(buffer, 256);
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n = recv(newsockfd, buffer, 255, 0);
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if (n < 0) error("ERROR reading from socket");
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printf("Here is the message: %s\n", buffer);
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n = send(newsockfd, "I got your message", 18, 0);
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if (n < 0) error("ERROR writing to socket");
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close(newsockfd);
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close(sockfd);
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return 0;
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}
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