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aiifunc.c
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aiifunc.c
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/*
* Copyright (c) 2010-2011, Red Hat, Inc.
*
* Permission to use, copy, modify, and/or 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.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND RED HAT, INC. DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL RED HAT, INC. BE LIABLE
* FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* Author: Jan Friesse <[email protected]>
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <err.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include "addrfunc.h"
#include "aiifunc.h"
#include "logging.h"
#include "omping.h"
/*
* Free content of aii_list. List must have sas field active (not ai field)
*/
void
aii_list_free(struct aii_list *aii_list)
{
struct ai_item *ai_item;
struct ai_item *ai_item_next;
ai_item = TAILQ_FIRST(aii_list);
while (ai_item != NULL) {
ai_item_next = TAILQ_NEXT(ai_item, entries);
free(ai_item->host_name);
free(ai_item);
ai_item = ai_item_next;
}
TAILQ_INIT(aii_list);
}
/*
* Convert list of addrs of addrinfo to list of addrs of sockaddr_storage. This function will also
* correctly free addrinfo(s) in list.
*/
void
aii_list_ai_to_sa(struct aii_list *aii_list, int ip_ver)
{
struct sockaddr_storage tmp_sas;
struct addrinfo *ai_i;
struct ai_item *ai_item_i;
char *hn;
TAILQ_FOREACH(ai_item_i, aii_list, entries) {
hn = (char *)malloc(strlen(ai_item_i->host_name) + 1);
if (hn == NULL) {
errx(1, "Can't alloc memory");
}
memcpy(hn, ai_item_i->host_name, strlen(ai_item_i->host_name) + 1);
ai_item_i->host_name = hn;
for (ai_i = ai_item_i->ai; ai_i != NULL; ai_i = ai_i->ai_next) {
if (af_ai_supported_ipv(ai_i) == ip_ver) {
memset(&tmp_sas, 0, sizeof(tmp_sas));
memcpy(&tmp_sas, ai_i->ai_addr, ai_i->ai_addrlen);
freeaddrinfo(ai_item_i->ai);
memcpy(&ai_item_i->sas, &tmp_sas, sizeof(tmp_sas));
break;
}
}
}
}
/*
* Tries to find local address in aii_list with given ip_ver. if_flags may be set to bit mask with
* IFF_MULTICAST and/or IFF_BROADCAST and only network interface with that flags will be accepted.
* Returns 0 on success, otherwise -1.
* It also changes ifa_list (result of getaddrs), ifa_local (local addr) and ai_item (addrinfo item
* which matches ifa_local).
*/
int
aii_find_local(const struct aii_list *aii_list, int *ip_ver, struct ifaddrs **ifa_list,
struct ifaddrs **ifa_local, struct ai_item **ai_item, unsigned int if_flags)
{
struct addrinfo *ai_i;
struct ai_item *aip;
struct ifaddrs *ifa, *ifa_i;
char sa_str[LOGGING_SA_TO_STR_LEN];
char sa_str2[LOGGING_SA_TO_STR_LEN];
int ipv4_fallback;
int res;
*ifa_local = NULL;
ifa_i = NULL;
ipv4_fallback = 0;
if (getifaddrs(&ifa) == -1) {
err(1, "getifaddrs");
}
TAILQ_FOREACH(aip, aii_list, entries) {
for (ai_i = aip->ai; ai_i != NULL; ai_i = ai_i->ai_next) {
if (af_ai_is_dup(aip->ai, ai_i)) {
logging_sa_to_str(ai_i->ai_addr, sa_str, sizeof(sa_str));
DEBUG2_PRINTF("Found duplicate addr %s", sa_str);
continue ;
}
for (ifa_i = ifa; ifa_i != NULL; ifa_i = ifa_i->ifa_next) {
if (ifa_i->ifa_addr == NULL ||
(ifa_i->ifa_addr->sa_family != AF_INET &&
ifa_i->ifa_addr->sa_family != AF_INET6)) {
continue ;
}
logging_sa_to_str(ifa_i->ifa_addr, sa_str, sizeof(sa_str));
logging_sa_to_str(ai_i->ai_addr, sa_str2, sizeof(sa_str2));
DEBUG2_PRINTF("Comparing %s(%s) with %s", sa_str, ifa_i->ifa_name,
sa_str2);
if (af_sockaddr_eq(ifa_i->ifa_addr, ai_i->ai_addr)) {
res = af_is_supported_local_ifa(ifa_i, *ip_ver, if_flags);
if (res == 1 || res == 2) {
if (*ifa_local != NULL && ipv4_fallback == 0)
goto multiple_match_error;
*ifa_list = ifa;
*ifa_local = ifa_i;
*ai_item = aip;
if (*ip_ver == 0) {
/*
* Device supports ipv6
*/
*ip_ver = 6;
DEBUG2_PRINTF("Supports ipv6");
}
if (res == 2) {
/*
* Set this item as ipv4 fallback
*/
ipv4_fallback++;
DEBUG2_PRINTF("Supports ipv4 - fallback");
}
}
}
}
}
}
if (*ip_ver == 0 && *ifa_local != NULL) {
if (ipv4_fallback > 1)
goto multiple_match_error;
*ip_ver = 4;
}
if (*ifa_local != NULL) {
return (0);
}
DEBUG_PRINTF("Can't find local addr");
return (-1);
multiple_match_error:
errx(1, "Multiple local interfaces (%s and %s) match parameters.",
ifa_i->ifa_name, (*ifa_local)->ifa_name);
return (-1);
}
/*
* Convert ifa_local addr to local_addr. If only one remote_host is entered, single_addr is set, if
* not then ai_local is freed and removed from list.
*/
void
aii_ifa_local_to_ai(struct aii_list *aii_list, struct ai_item *ai_local,
const struct ifaddrs *ifa_local, int UNUSED(ip_ver), struct ai_item *local_addr, int *single_addr)
{
size_t addr_len;
uint16_t port;
switch (ifa_local->ifa_addr->sa_family) {
case AF_INET:
addr_len = sizeof(struct sockaddr_in);
port = ((struct sockaddr_in *)&ai_local->sas)->sin_port;
break;
case AF_INET6:
addr_len = sizeof(struct sockaddr_in6);
port = ((struct sockaddr_in6 *)&ai_local->sas)->sin6_port;
break;
default:
DEBUG_PRINTF("Internal program error");
err(1, "Internal program error");
break;
}
memcpy(&local_addr->sas, ifa_local->ifa_addr, addr_len);
local_addr->host_name = strdup(ai_local->host_name);
if (local_addr->host_name == NULL) {
err(1, "Can't alloc memory");
/* NOTREACHED */
}
switch (ifa_local->ifa_addr->sa_family) {
case AF_INET:
((struct sockaddr_in *)&local_addr->sas)->sin_port = port;
break;
case AF_INET6:
((struct sockaddr_in6 *)&local_addr->sas)->sin6_port = port;
break;
default:
DEBUG_PRINTF("Internal program error");
err(1, "Internal program error");
break;
}
*single_addr = (TAILQ_NEXT(TAILQ_FIRST(aii_list), entries) == NULL);
if (!*single_addr) {
TAILQ_REMOVE(aii_list, ai_local, entries);
free(ai_local->host_name);
free(ai_local);
}
}
/*
* Convert ipbc_addr_s to ipbc_addr ai_item.
* Function returns 0 on success, -1 if given broadcast address is not same as local interface one.
*/
int
aii_ipbc_to_ai(struct ai_item *ipbc_addr, const char *ipbc_addr_s, const char *port_s,
const struct ifaddrs *ifa_local)
{
struct addrinfo *ai_res, *ai_i;
char ifa_ipbc_addr_s[INET6_ADDRSTRLEN];
int ip_ver;
ip_ver = 4;
if (ifa_local->ifa_broadaddr == NULL) {
errx(1, "selected local interface isn't broadcast aware");
}
if (ipbc_addr_s == NULL) {
af_sa_to_str(ifa_local->ifa_broadaddr, ifa_ipbc_addr_s);
ipbc_addr_s = ifa_ipbc_addr_s;
}
ipbc_addr->host_name = (char *)malloc(strlen(ipbc_addr_s) + 1);
if (ipbc_addr->host_name == NULL) {
errx(1, "Can't alloc memory");
}
memcpy(ipbc_addr->host_name, ipbc_addr_s, strlen(ipbc_addr_s) + 1);
ai_res = af_host_to_ai(ipbc_addr_s, port_s, ip_ver);
for (ai_i = ai_res; ai_i != NULL; ai_i = ai_i->ai_next) {
if (af_ai_supported_ipv(ai_i) == ip_ver) {
memcpy(&ipbc_addr->sas, ai_i->ai_addr, ai_i->ai_addrlen);
break;
}
}
if (ai_i == NULL) {
DEBUG_PRINTF("Internal program error");
err(1, "Internal program error");
}
freeaddrinfo(ai_res);
/*
* Test if interface broadcast addr is same as returned broadcast addr
*/
if (!af_sockaddr_eq(ifa_local->ifa_broadaddr, AF_CAST_SA(&ipbc_addr->sas))) {
return (-1);
}
return (0);
}
/*
* Test if addrinfo a1 is included in aii_list list. Return 1 if a1 is included, otherwise 0.
*/
int
aii_is_ai_in_list(const struct addrinfo *a1, const struct aii_list *aii_list)
{
struct ai_item *aip;
TAILQ_FOREACH(aip, aii_list, entries) {
if (af_ai_deep_eq(a1, aip->ai))
return (1);
}
return (0);
}
/*
* Convert mcast_addr_s to mcast_addr ai_item
*/
void
aii_mcast_to_ai(int ip_ver, struct ai_item *mcast_addr, const char *mcast_addr_s,
const char *port_s)
{
struct addrinfo *ai_res, *ai_i;
if (mcast_addr_s == NULL) {
switch (ip_ver) {
case 4:
mcast_addr_s = DEFAULT_MCAST4_ADDR;
break;
case 6:
mcast_addr_s = DEFAULT_MCAST6_ADDR;
break;
default:
DEBUG_PRINTF("Internal program error");
err(1, "Internal program error");
break;
}
}
mcast_addr->host_name = (char *)malloc(strlen(mcast_addr_s) + 1);
if (mcast_addr->host_name == NULL) {
errx(1, "Can't alloc memory");
}
memcpy(mcast_addr->host_name, mcast_addr_s, strlen(mcast_addr_s) + 1);
ai_res = af_host_to_ai(mcast_addr_s, port_s, ip_ver);
for (ai_i = ai_res; ai_i != NULL; ai_i = ai_i->ai_next) {
if (af_ai_supported_ipv(ai_i) == ip_ver) {
memcpy(&mcast_addr->sas, ai_i->ai_addr, ai_i->ai_addrlen);
break;
}
}
if (ai_i == NULL) {
DEBUG_PRINTF("Internal program error");
err(1, "Internal program error");
}
freeaddrinfo(ai_res);
/*
* Test if addr is really multicast
*/
if (!af_is_sa_mcast(AF_CAST_SA(&mcast_addr->sas))) {
errx(1, "Given address %s is not valid multicast address", mcast_addr_s);
}
}
/*
* Parse remote addresses. argc is number of addressed in argv array. port is string representation
* of port, ip_ver can be 4, 6 or 0 and aii_list will contain parsed items.
* Return number of added addresses.
*/
int
aii_parse_remote_addrs(struct aii_list *aii_list, int argc, char * const argv[], const char *port,
int ip_ver)
{
struct addrinfo *ai_res;
struct ai_item *ai_item;
int no_ai;
int i;
no_ai = 0;
for (i = 0; i < argc; i++) {
ai_res = af_host_to_ai(argv[i], port, ip_ver);
if (!aii_is_ai_in_list(ai_res, aii_list)) {
if (af_ai_deep_is_loopback(ai_res)) {
errx(1,"Address %s looks like loopback. Loopback ping is not "
"supported", argv[i]);
}
if (af_ai_deep_is_mcast(ai_res)) {
errx(1,"Address %s looks like multicast. To set multicast address "
"use -m parameter", argv[i]);
}
ai_item = (struct ai_item *)malloc(sizeof(struct ai_item));
if (ai_item == NULL) {
errx(1, "Can't alloc memory");
}
memset(ai_item, 0, sizeof(struct ai_item));
ai_item->ai = ai_res;
ai_item->host_name = argv[i];
TAILQ_INSERT_TAIL(aii_list, ai_item, entries);
DEBUG_PRINTF("new address \"%s\" added to list (position %d)", argv[i],
no_ai);
no_ai++;
} else {
freeaddrinfo(ai_res);
}
}
return (no_ai);
}
/*
* Return ip version to use. Algorithm is following:
* - If user forced ip version, we will return that one.
* - If user entered mcast addr, we will look, what it supports
* - if only one version is supported, we will return that version
* - otherwise walk addresses and find out, what they support
* - test if every addresses support all versions.
* - If not, test that version for every other addresses
* - if all of them support that version -> return that version
* - if not -> return error
* - otherwise return 0 (item in find_local_addrinfo will be used but preferably ipv6)
*/
int
aii_return_ip_ver(struct aii_list *aii_list, int ip_ver, const char *mcast_addr, const char *port)
{
struct addrinfo *ai_res;
struct ai_item *aip;
int mcast_ipver;
int ipver_res, ipver_res2;
if (ip_ver != 0) {
DEBUG_PRINTF("user forced forced ip_ver is %d, using that", ip_ver);
return (ip_ver);
}
if (mcast_addr != NULL) {
ai_res = af_host_to_ai(mcast_addr, port, ip_ver);
mcast_ipver = af_ai_deep_supported_ipv(ai_res);
DEBUG2_PRINTF("mcast_ipver for %s is %d", mcast_addr, mcast_ipver);
freeaddrinfo(ai_res);
if (mcast_ipver == -1) {
errx(1, "Mcast address %s doesn't support ipv4 or ipv6", mcast_addr);
}
if (mcast_ipver != 0) {
DEBUG_PRINTF("mcast address for %s supports only ipv%d, using that",
mcast_addr, mcast_ipver);
/*
* Walk thru all addresses to find out, what it supports
*/
TAILQ_FOREACH(aip, aii_list, entries) {
ipver_res = af_ai_deep_supported_ipv(aip->ai);
DEBUG2_PRINTF("ipver for %s is %d", aip->host_name, ipver_res);
if (ipver_res == -1) {
errx(1, "Host %s doesn't support ipv4 or ipv6",
aip->host_name);
}
if (ipver_res != 0 && ipver_res != mcast_ipver) {
errx(1, "Multicast address is ipv%d but host %s supports"
" only ipv%d", mcast_ipver, aip->host_name, ipver_res);
}
}
return (mcast_ipver);
}
}
ipver_res = 0;
/*
* Walk thru all addresses to find out, what it supports
*/
TAILQ_FOREACH(aip, aii_list, entries) {
ipver_res = af_ai_deep_supported_ipv(aip->ai);
DEBUG2_PRINTF("ipver for %s is %d", aip->host_name, ipver_res);
if (ipver_res == -1) {
errx(1, "Host %s doesn't support ipv4 or ipv6", aip->host_name);
}
if (ipver_res != 0) {
break;
}
}
if (ipver_res == 0) {
/*
* Every address support every version
*/
DEBUG_PRINTF("Every address support all IP versions");
return (0);
}
if (ipver_res != 0) {
/*
* Host supports only one version.
* Test availability for that version on all hosts
*/
TAILQ_FOREACH(aip, aii_list, entries) {
ipver_res2 = af_ai_deep_supported_ipv(aip->ai);
DEBUG2_PRINTF("ipver for %s is %d", aip->host_name, ipver_res2);
if (ipver_res2 == -1) {
errx(1, "Host %s doesn't support ipv4 or ipv6", aip->host_name);
}
if (ipver_res2 != 0 && ipver_res2 != ipver_res) {
/*
* Host doesn't support ip version of other members
*/
errx(1, "Host %s doesn't support IP version %d", aip->host_name,
ipver_res);
}
}
}
DEBUG_PRINTF("Every address support ipv%d", ipver_res);
return (ipver_res);
}