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#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include "tcp.h"
int tcp_verbose;
/* ------------------------------------------------------------------ */
static char *strfamily(int family)
{
switch (family) {
case PF_INET6: return "ipv6";
case PF_INET: return "ipv4";
case PF_UNIX: return "unix";
}
return "????";
}
int tcp_connect(struct addrinfo *ai,
char *addr, char *port,
char *host, char *serv)
{
struct addrinfo *res,*e;
struct addrinfo *lres, ask;
char uaddr[INET6_ADDRSTRLEN+1];
char uport[33];
char uhost[INET6_ADDRSTRLEN+1];
char userv[33];
int sock,rc,opt=1;
/* lookup peer */
ai->ai_flags = AI_CANONNAME;
if (0 != (rc = getaddrinfo(host, serv, ai, &res))) {
if (tcp_verbose)
fprintf(stderr,"getaddrinfo (peer): %s\n",gai_strerror(rc));
return -1;
}
for (e = res; e != NULL; e = e->ai_next) {
if (0 != getnameinfo((struct sockaddr*)e->ai_addr,e->ai_addrlen,
uhost,INET6_ADDRSTRLEN,userv,32,
NI_NUMERICHOST | NI_NUMERICSERV)) {
if (tcp_verbose)
fprintf(stderr,"getnameinfo (peer): oops\n");
continue;
}
if (-1 == (sock = socket(e->ai_family, e->ai_socktype,
e->ai_protocol))) {
if (tcp_verbose)
fprintf(stderr,"socket (%s): %s\n",
strfamily(e->ai_family),strerror(errno));
continue;
}
setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,&opt,sizeof(opt));
if (NULL != addr || NULL != port) {
/* bind local port */
memset(&ask,0,sizeof(ask));
ask.ai_flags = AI_PASSIVE;
ask.ai_family = e->ai_family;
ask.ai_socktype = e->ai_socktype;
if (0 != (rc = getaddrinfo(addr, port, &ask, &lres))) {
if (tcp_verbose)
fprintf(stderr,"getaddrinfo (local): %s\n",
gai_strerror(rc));
continue;
}
if (0 != getnameinfo((struct sockaddr*)lres->ai_addr,
lres->ai_addrlen,
uaddr,INET6_ADDRSTRLEN,uport,32,
NI_NUMERICHOST | NI_NUMERICSERV)) {
if (tcp_verbose)
fprintf(stderr,"getnameinfo (local): oops\n");
continue;
}
if (-1 == bind(sock, lres->ai_addr, lres->ai_addrlen)) {
if (tcp_verbose)
fprintf(stderr,"%s [%s] %s bind: %s\n",
strfamily(lres->ai_family),uaddr,uport,
strerror(errno));
continue;
}
}
/* connect to peer */
if (-1 == connect(sock,e->ai_addr,e->ai_addrlen)) {
if (tcp_verbose)
fprintf(stderr,"%s %s [%s] %s connect: %s\n",
strfamily(e->ai_family),e->ai_canonname,uhost,userv,
strerror(errno));
close(sock);
continue;
}
if (tcp_verbose)
fprintf(stderr,"%s %s [%s] %s open\n",
strfamily(e->ai_family),e->ai_canonname,uhost,userv);
fcntl(sock,F_SETFL,O_NONBLOCK);
return sock;
}
return -1;
}
int tcp_listen(struct addrinfo *ai, char *addr, char *port)
{
struct addrinfo *res,*e;
char uaddr[INET6_ADDRSTRLEN+1];
char uport[33];
int slisten,rc,opt=1;
/* lookup */
ai->ai_flags = AI_PASSIVE;
if (0 != (rc = getaddrinfo(addr, port, ai, &res))) {
if (tcp_verbose)
fprintf(stderr,"getaddrinfo: %s\n",gai_strerror(rc));
exit(1);
}
/* create socket + bind */
for (e = res; e != NULL; e = e->ai_next) {
getnameinfo((struct sockaddr*)e->ai_addr,e->ai_addrlen,
uaddr,INET6_ADDRSTRLEN,uport,32,
NI_NUMERICHOST | NI_NUMERICSERV);
if (-1 == (slisten = socket(e->ai_family, e->ai_socktype,
e->ai_protocol))) {
if (tcp_verbose)
fprintf(stderr,"socket (%s): %s\n",
strfamily(e->ai_family),strerror(errno));
continue;
}
opt = 1;
setsockopt(slisten,SOL_SOCKET,SO_REUSEADDR,&opt,sizeof(opt));
if (-1 == bind(slisten, e->ai_addr, e->ai_addrlen)) {
if (tcp_verbose)
fprintf(stderr,"%s [%s] %s bind: %s\n",
strfamily(e->ai_family),uaddr,uport,
strerror(errno));
continue;
}
listen(slisten,1);
break;
}
if (NULL == e)
return -1;
/* wait for a incoming connection */
if (tcp_verbose)
fprintf(stderr,"listen on %s [%s] %s ...\n",
strfamily(e->ai_family),uaddr,uport);
fcntl(slisten,F_SETFL,O_NONBLOCK);
return slisten;
}
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