freebsd-skq/contrib/bsnmp/lib/support.c
2016-12-27 23:32:54 +00:00

195 lines
4.2 KiB
C

/*
* Copyright (C) 2004
* Hartmut Brandt.
* All rights reserved.
*
* Author: Harti Brandt <harti@freebsd.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Begemot: bsnmp/lib/support.c,v 1.1 2004/08/06 08:47:58 brandt Exp $
*
* Functions that are missing on certain systems.
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <errno.h>
#include <string.h>
#include "support.h"
#ifndef HAVE_ERR_H
void
warnx(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
fprintf(stderr, "warning: ");
vfprintf(stderr, fmt, ap);
fprintf(stderr, "\n");
va_end(ap);
}
void
warn(const char *fmt, ...)
{
va_list ap;
int e = errno;
va_start(ap, fmt);
fprintf(stderr, "warning: ");
vfprintf(stderr, fmt, ap);
fprintf(stderr, ": %s\n", strerror(e));
va_end(ap);
}
void
errx(int code, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
fprintf(stderr, "error: ");
vfprintf(stderr, fmt, ap);
fprintf(stderr, "\n");
va_end(ap);
exit(code);
}
void
err(int code, const char *fmt, ...)
{
va_list ap;
int e = errno;
va_start(ap, fmt);
fprintf(stderr, "error: ");
vfprintf(stderr, fmt, ap);
fprintf(stderr, ": %s\n", strerror(e));
va_end(ap);
exit(code);
}
#endif
#ifndef HAVE_STRLCPY
size_t
strlcpy(char *dst, const char *src, size_t len)
{
size_t ret = strlen(dst);
while (len > 1) {
*dst++ = *src++;
len--;
}
if (len > 0)
*dst = '\0';
return (ret);
}
#endif
#ifndef HAVE_GETADDRINFO
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
extern int h_nerr;
extern int h_errno;
extern const char *h_errlist[];
/*
* VERY poor man's implementation
*/
int
getaddrinfo(const char *host, const char *port, const struct addrinfo *hints,
struct addrinfo **res)
{
struct hostent *hent;
struct sockaddr_in *s;
struct servent *sent;
if ((hent = gethostbyname(host)) == NULL)
return (h_errno);
if (hent->h_addrtype != hints->ai_family)
return (HOST_NOT_FOUND);
if (hent->h_addrtype != AF_INET)
return (HOST_NOT_FOUND);
if ((*res = malloc(sizeof(**res))) == NULL)
return (HOST_NOT_FOUND);
(*res)->ai_flags = hints->ai_flags;
(*res)->ai_family = hints->ai_family;
(*res)->ai_socktype = hints->ai_socktype;
(*res)->ai_protocol = hints->ai_protocol;
(*res)->ai_next = NULL;
if (((*res)->ai_addr = malloc(sizeof(struct sockaddr_in))) == NULL) {
freeaddrinfo(*res);
return (HOST_NOT_FOUND);
}
(*res)->ai_addrlen = sizeof(struct sockaddr_in);
s = (struct sockaddr_in *)(*res)->ai_addr;
s->sin_family = hints->ai_family;
s->sin_len = sizeof(*s);
memcpy(&s->sin_addr, hent->h_addr, 4);
if ((sent = getservbyname(port, NULL)) == NULL) {
freeaddrinfo(*res);
return (HOST_NOT_FOUND);
}
s->sin_port = sent->s_port;
return (0);
}
const char *
gai_strerror(int e)
{
if (e < 0 || e >= h_nerr)
return ("unknown error");
return (h_errlist[e]);
}
void
freeaddrinfo(struct addrinfo *p)
{
struct addrinfo *next;
while (p != NULL) {
next = p->ai_next;
if (p->ai_addr != NULL)
free(p->ai_addr);
free(p);
p = next;
}
}
#endif