/* File Name: tcp-server-simple.c * Created by: Jacob Dawley-Carr * Creation date: 2004-08-18 18:00:53 -0500 * Description: */ #include #include #include #include #include #include #include const short LOCAL_PORT = 31415; void toString(sockaddr_in * addr_in, char * buff) { long addr = ntohl(addr_in->sin_addr.s_addr); int port = ntohs(addr_in->sin_port); int q0 = ( addr >> 24 ) & 0xFF; int q1 = ( addr >> 16 ) & 0xFF; int q2 = ( addr >> 8 ) & 0xFF; int q3 = ( addr >> 0 ) & 0xFF; sprintf(buff, "%d.%d.%d.%d:%d", q0, q1, q2, q3, port); return; } int main() { sockaddr_in localEndpoint; char localEndpointString[32]; int serverFd; int retval = 0; memset(&localEndpoint, 0, sizeof(sockaddr_in)); if(retval == 0) { if((serverFd = socket(AF_INET, SOCK_STREAM, 0)) < 0) { perror("socket()"); retval = 1; } } if(retval == 0) { char operation[32]; socklen_t addrlen = sizeof(sockaddr_in); localEndpoint.sin_family = AF_INET; localEndpoint.sin_addr.s_addr = INADDR_ANY; localEndpoint.sin_port = htons(LOCAL_PORT); toString(&localEndpoint, localEndpointString); sprintf(operation, "bind(%s)", localEndpointString); if(bind(serverFd, (sockaddr *) &localEndpoint, addrlen) < 0) { perror(operation); retval = 2; } else { printf("%s\n", operation); } } if(retval == 0) { if(listen(serverFd, 1) < 0) { retval = 3; } } while(retval == 0) { int clientFd; sockaddr_in remoteEndpoint; char remoteEndpointString[32]; memset(&remoteEndpoint, 0, sizeof(sockaddr_in)); if(retval == 0) { socklen_t addrlen = sizeof(sockaddr_in); clientFd = accept(serverFd, (sockaddr *) &remoteEndpoint, &addrlen); if(clientFd < 0) { perror("accept()"); retval = 4; } else { char operation [64]; toString(&remoteEndpoint, remoteEndpointString); sprintf(operation, "accept(%s)", remoteEndpointString); printf("%s\n", operation); } } if(retval == 0) { char msg1 [] = "server says:\r\n"; char msg2 [64]; sprintf(msg2, "local %s <-> remote %s\r\n", localEndpointString, remoteEndpointString); send(clientFd, msg1, strlen(msg1), 0); send(clientFd, msg2, strlen(msg2), 0); shutdown(clientFd, SHUT_RDWR); } } return retval; }