can't get server socket working

Newsgroup: comp.lang.c++

Subject: can't get server socket working

From: cerr <ron.eggler@...>

Date: Tue, 29 Oct 2013 09:31:12 -0700 (PDT)



Hi,



I'm trying to get a server socket working but for some reason this doesn't allow any connections on 127.0.0.1:1234. What might be wrong here? No errors are being reported:



#include <iostream>

#include <unistd.h>

#include <stdlib.h>

#include <sys/types.h>

#include <sys/socket.h>

#include <netdb.h>

#include <string.h>

#include <stdio.h>



#define BUF_SIZE 500

using namespace std;



int getserversocket(int port);



int main (void)

{

socklen_t peer_addr_len;

ssize_t nread;

int sockhandle, s;

struct sockaddr_storage peer_addr;

char buf[BUF_SIZE];



cout << "MyServer 1.0" << endl;

if (sockhandle = getserversocket(1234) >= 0){

cout << "Socket created!" << endl;

} else {

cout << "Could not bind" << endl;

}

while(sockhandle >= 0) {

peer_addr_len = sizeof(struct sockaddr_storage);

nread = recvfrom(sockhandle, buf, BUF_SIZE, 0,

(struct sockaddr *) &peer_addr, &peer_addr_len);

if (nread == -1)

continue; /* Ignore failed request */



char host[NI_MAXHOST], service[NI_MAXSERV];



s = getnameinfo((struct sockaddr *) &peer_addr,

peer_addr_len, host, NI_MAXHOST,

service, NI_MAXSERV, NI_NUMERICSERV);

if (s == 0)

cout << "Received "<< (long)nread << "bytes from " << host << ":" << service << endl;

else

fprintf(stderr, "getnameinfo: %s\n", gai_strerror(s));



if (sendto(sockhandle, buf, nread, 0,

(struct sockaddr *) &peer_addr,

peer_addr_len) != nread)

cout << "Error sending response" << endl;

}





}



int getserversocket(int port)

{

struct addrinfo hints;

struct addrinfo *result, *rp;

int addrinfo, sock;

char port_chr[5];

sprintf(port_chr,"%d",port);



memset(&hints, 0, sizeof(struct addrinfo));

hints.ai_family = AF_UNSPEC; /* Allow IPv4 or IPv6 */

hints.ai_socktype = SOCK_DGRAM; /* Datagram socket */

hints.ai_flags = AI_PASSIVE; /* For wildcard IP address */

hints.ai_protocol = 0; /* Any protocol */

hints.ai_canonname = NULL;

hints.ai_addr = NULL;

hints.ai_next = NULL;



addrinfo = getaddrinfo(NULL, port_chr, &hints, &result);

if (addrinfo != 0) {

fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(addrinfo));

exit(EXIT_FAILURE);

}



for (rp = result; rp != NULL; rp = rp->ai_next) {

sock = socket(rp->ai_family, rp->ai_socktype,

rp->ai_protocol);

if (sock == -1)

continue;



if (bind(sock, rp->ai_addr, rp->ai_addrlen) == 0)

break; /* Success */



close(sock);

}

freeaddrinfo(result); /* No longer needed */



if (rp == NULL) { /* No address succeeded */

return -1;

}

else

return sock;

}



Any assistance would be appreciated, Thank you!

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