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/*
ELAPI
Special platform specific functions related to networking
Copyright (C) Dmitri Pal <dpal@redhat.com> 2009
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#define _GNU_SOURCE
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <stdlib.h>
#include <errno.h>
#include "elapi_ioctl.h"
#include "trace.h"
#include "config.h"
#ifndef HAVE_GETIFADDRS
/* These functions are taken form Stevens's
* UNIX Network Programming Volume 1
*/
int elapi_get_addrlist(struct ifconf *ifc)
{
int sockfd;
int length, lastlen;
int error;
char *buffer;
TRACE_FLOW_STRING("elapi_get_addrlist", "Entry");
/* Open socket */
sockfd = socket(AF_INET, SOCK_DGRAM, 0);
lastlen = 0;
length = INTERFACE_NUM_GUESS * sizeof(struct ifreq);
/* Allocate right amount of memory */
/* This is a trick from Stevens book */
/* Search web for "get_ifi_info" to get original code */
for ( ; ; ) {
buffer = malloc(length);
ifc->ifc_len = length;
ifc->ifc_buf = buffer;
/* Read list */
if (ioctl(sockfd, SIOCGIFCONF, ifc) < 0) {
error = errno;
TRACE_INFO_NUMBER("Ioctl call failed", error);
if (error != EINVAL || lastlen != 0) {
free(buffer);
TRACE_ERROR_NUMBER("ioctl failed", error);
return error;
}
} else {
TRACE_INFO_NUMBER("Length returned", ifc->ifc_len);
TRACE_INFO_NUMBER("Previous length", lastlen);
/* Break if length is same */
if (ifc->ifc_len == lastlen) break;
lastlen = ifc->ifc_len;
}
/* Grow length */
length += INTERFACE_NUM_INC * sizeof(struct ifreq);
free(buffer);
}
TRACE_FLOW_STRING("elapi_get_addrlist", "Exit");
return EOK;
}
/* Get the variable part of the size of the address */
static int elapi_get_addrlen(struct ifreq *ifr)
{
int len;
TRACE_FLOW_STRING("elapi_get_addrlen", "Entry");
#ifdef HAVE_SOCKADDR_SA_LEN
len = max(sizeof(struct sockaddr), ifr->ifr_addr.sa_len);
#else
switch (ifr->ifr_addr.sa_family) {
#ifdef IPV6
case AF_INET6:
len = sizeof(struct sockaddr_in6);
break;
#endif
case AF_INET:
default:
len = sizeof(struct sockaddr);
break;
}
#endif /* HAVE_SOCKADDR_SA_LEN */
TRACE_FLOW_NUMBER("elapi_get_addrlen Returning", len);
return len;
}
/* Get next address */
struct ifreq *elapi_get_next_addr(struct ifconf *ifc, struct ifreq *current)
{
char *ifr;
TRACE_FLOW_STRING("elapi_get_next_addr", "Entry");
TRACE_INFO_NUMBER("Current ifi", current);
TRACE_INFO_NUMBER("Address", ¤t->ifr_addr);
/* Move to the next item */
ifr = (char *)current + sizeof(current->ifr_name) + elapi_get_addrlen(current);
TRACE_INFO_NUMBER("New ifi", ifr);
/* Check if we are beyond the end of the allocated area */
/* Have to cast otherwise get warnings */
if (ifr >= ((char *)ifc->ifc_buf + ifc->ifc_len)) ifr = NULL;
TRACE_INFO_NUMBER("New ifi adjusted", ifr);
TRACE_FLOW_STRING("elapi_get_next_addr", "Exit");
return (struct ifreq *)ifr;
}
#endif /* HAVE_GETIFADDRS */
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