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/************************************************************************\
* INET_RSTREAM.C *
* Test of TCP/IP. Set up a socket for establishing a connection at *
* some free port on the local host. After accepting a connection, speak *
* briefly to peer, and then read char at a time from the stream. Write *
* to stdout. At EOF, shut down. *
* *
* Phil Kearns *
* April 11, 1987 *
* *
* Modified February 2009 to use getaddrinfo() *
\************************************************************************/
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
void printsin(struct sockaddr_in*, char*, char*);
int main()
{
int listener; /* fd for socket on which we get connection requests */
int conn; /* fd for socket thru which we pass data */
struct sockaddr_in *localaddr, peer;
int ecode;
socklen_t length;
char ch;
struct addrinfo hints, *addrlist;
/*
Want to specify local server address of:
addressing family: AF_INET
ip address: any interface on this system
port: 0 => system will pick free port
*/
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_INET; hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_NUMERICSERV | AI_PASSIVE; hints.ai_protocol = 0;
hints.ai_canonname = NULL; hints.ai_addr = NULL;
hints.ai_next = NULL;
ecode = getaddrinfo(NULL, "0", &hints, &addrlist);
if (ecode != 0) {
fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(ecode));
exit(1);
}
localaddr = (struct sockaddr_in *) addrlist->ai_addr;
/*
Create socket on which we will accept connections. This is NOT the
same as the socket on which we pass data.
*/
if ( (listener = socket( addrlist->ai_family, addrlist->ai_socktype, 0 )) < 0 ) {
perror("inet_rstream:socket");
exit(1);
}
if (bind(listener, (struct sockaddr *)localaddr, sizeof(struct sockaddr_in)) < 0) {
perror("inet_rstream:bind");
exit(1);
}
/*
Print out the port number assigned to this process by bind().
*/
length = sizeof(struct sockaddr_in);
if (getsockname(listener, (struct sockaddr *)localaddr, &length) < 0) {
perror("inet_rstream:getsockname");
exit(1);
}
printf("RSTREAM:: assigned port number %d\n", ntohs(localaddr->sin_port));
/*
Now accept a single connection. Upon connection, data will be
passed through the socket on descriptor conn.
*/
listen(listener,1);
length = sizeof(peer);
if ((conn=accept(listener, (struct sockaddr *)&peer, &length)) < 0) {
perror("inet_rstream:accept");
exit(1);
}
printsin(&peer,"RSTREAM::", "accepted connection from");
printf("\n\nRSTREAM:: data from stream:\n");
while ( read(conn, &ch, 1) == 1)
putchar(ch);
putchar('\n');
exit(0);
}
void printsin(struct sockaddr_in *sin, char *m1, char *m2 )
{
char fromip[INET_ADDRSTRLEN];
printf ("%s %s:\n", m1, m2);
printf (" family %d, addr %s, port %d\n", sin -> sin_family,
inet_ntop(AF_INET, &(sin->sin_addr.s_addr), fromip, sizeof(fromip)),
ntohs((unsigned short)(sin -> sin_port)));
}
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