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/*
* Copyright (C) 2006 Stig Venaas <venaas@uninett.no>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*/
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <stdarg.h>
void errx(char *format, ...) {
extern int errno;
va_list ap;
va_start(ap, format);
vfprintf(stderr, format, ap);
va_end(ap);
if (errno) {
fprintf(stderr, ": ");
perror(NULL);
fprintf(stderr, "errno=%d\n", errno);
} else
fprintf(stderr, "\n");
exit(1);
}
void err(char *format, ...) {
extern int errno;
va_list ap;
va_start(ap, format);
vfprintf(stderr, format, ap);
va_end(ap);
if (errno) {
fprintf(stderr, ": ");
perror(NULL);
fprintf(stderr, "errno=%d\n", errno);
} else
fprintf(stderr, "\n");
}
char *stringcopy(char *s, int len) {
char *r;
if (!len)
len = strlen(s);
r = malloc(len + 1);
if (!r)
errx("stringcopy: malloc failed");
memcpy(r, s, len);
r[len] = '\0';
return r;
}
char *addr2string(struct sockaddr *addr, socklen_t len) {
struct sockaddr_in6 *sa6;
struct sockaddr_in sa4;
static char addr_buf[2][INET6_ADDRSTRLEN];
static int i = 0;
i = !i;
if (addr->sa_family == AF_INET6) {
sa6 = (struct sockaddr_in6 *)addr;
if (IN6_IS_ADDR_V4MAPPED(&sa6->sin6_addr)) {
memset(&sa4, 0, sizeof(sa4));
sa4.sin_family = AF_INET;
sa4.sin_port = sa6->sin6_port;
memcpy(&sa4.sin_addr, &sa6->sin6_addr.s6_addr[12], 4);
addr = (struct sockaddr *)&sa4;
}
}
if (getnameinfo(addr, len, addr_buf[i], sizeof(addr_buf[i]),
NULL, 0, NI_NUMERICHOST)) {
err("getnameinfo");
return NULL;
}
return addr_buf[i];
}
int bindport(int type, char *port) {
struct addrinfo hints, *res0, *res;
int s, one = 1;
memset(&hints, 0, sizeof(hints));
hints.ai_socktype = type;
hints.ai_family = AF_UNSPEC;
hints.ai_flags = AI_PASSIVE;
if (getaddrinfo(NULL, port, &hints, &res0) != 0) {
err("bindport: can't resolve port %s", port);
return -1;
}
for (res = res0; res; res = res->ai_next) {
s = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
if (s >= 0) {
setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
if (bind(s, res->ai_addr, res->ai_addrlen) == 0)
break;
close(s);
s = -1;
}
}
freeaddrinfo(res0);
return s;
}
int connectport(int type, char *host, char *port) {
struct addrinfo hints, *res0, *res;
int s;
memset(&hints, 0, sizeof(hints));
hints.ai_socktype = type;
hints.ai_family = AF_UNSPEC;
if (getaddrinfo(host, port, &hints, &res0) != 0) {
err("connectport: can't resolve host %s port %s", host, port);
return -1;
}
for (res = res0; res; res = res->ai_next) {
s = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
if (s < 0) {
err("connectport: socket failed");
continue;
}
if (connect(s, res->ai_addr, res->ai_addrlen) == 0)
break;
err("connectport: connect failed");
close(s);
s = -1;
}
freeaddrinfo(res0);
return s;
}
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