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/* IPV4 base transport support functions
*/
#include <net-snmp/net-snmp-config.h>
#include <net-snmp/types.h>
#include <net-snmp/library/snmpIPBaseDomain.h>
#include <net-snmp/library/snmpIPv4BaseDomain.h>
#include <net-snmp/library/snmp_assert.h>
#include <stddef.h>
#include <stdio.h>
#include <sys/types.h>
#include <ctype.h>
#if HAVE_STDLIB_H
#include <stdlib.h>
#endif
#if HAVE_STRING_H
#include <string.h>
#else
#include <strings.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif
#include <net-snmp/types.h>
#include <net-snmp/library/snmp_debug.h>
#include <net-snmp/library/default_store.h>
#include <net-snmp/library/system.h>
#include "inet_ntop.h"
#ifndef INADDR_NONE
#define INADDR_NONE -1
#endif
int
netsnmp_sockaddr_in(struct sockaddr_in *addr,
const char *inpeername, int remote_port)
{
char buf[sizeof(int) * 3 + 2];
sprintf(buf, ":%u", remote_port);
return netsnmp_sockaddr_in2(addr, inpeername, remote_port ? buf : NULL);
}
int
netsnmp_sockaddr_in2(struct sockaddr_in *addr,
const char *inpeername, const char *default_target)
{
struct netsnmp_ep ep;
int ret;
ret = netsnmp_sockaddr_in3(&ep, inpeername, default_target);
if (ret == 0)
return 0;
*addr = ep.a.sin;
return ret;
}
int
netsnmp_sockaddr_in3(struct netsnmp_ep *ep,
const char *inpeername, const char *default_target)
{
struct sockaddr_in *addr = &ep->a.sin;
struct netsnmp_ep_str ep_str;
int port, ret;
if (!ep)
return 0;
DEBUGMSGTL(("netsnmp_sockaddr_in",
"addr %p, inpeername \"%s\", default_target \"%s\"\n",
ep, inpeername ? inpeername : "[NIL]",
default_target ? default_target : "[NIL]"));
memset(ep, 0, sizeof(*ep));
addr->sin_addr.s_addr = htonl(INADDR_ANY);
addr->sin_family = AF_INET;
addr->sin_port = htons((u_short)SNMP_PORT);
memset(&ep_str, 0, sizeof(ep_str));
port = netsnmp_ds_get_int(NETSNMP_DS_LIBRARY_ID,
NETSNMP_DS_LIB_DEFAULT_PORT);
if (port != 0)
snprintf(ep_str.port, sizeof(ep_str.port), "%d", port);
else if (default_target &&
!netsnmp_parse_ep_str(&ep_str, default_target))
snmp_log(LOG_ERR, "Invalid default target %s\n",
default_target);
if (inpeername && *inpeername != '\0' &&
!netsnmp_parse_ep_str(&ep_str, inpeername))
return 0;
if (ep_str.port[0])
addr->sin_port = htons(atoi(ep_str.port));
if (ep_str.iface[0])
strlcpy(ep->iface, ep_str.iface, sizeof(ep->iface));
if (strcmp(ep_str.addr, "255.255.255.255") == 0) {
/*
* The explicit broadcast address hack
*/
DEBUGMSGTL(("netsnmp_sockaddr_in", "Explicit UDP broadcast\n"));
addr->sin_addr.s_addr = INADDR_NONE;
} else if (strcmp(ep_str.addr, "") != 0) {
ret = netsnmp_gethostbyname_v4(ep_str.addr, &addr->sin_addr.s_addr);
if (ret < 0) {
DEBUGMSGTL(("netsnmp_sockaddr_in",
"couldn't resolve hostname \"%s\"\n", ep_str.addr));
return 0;
}
DEBUGMSGTL(("netsnmp_sockaddr_in",
"hostname (resolved okay)\n"));
}
/*
* Finished
*/
DEBUGMSGTL(("netsnmp_sockaddr_in", "return { AF_INET, %s:%hu }\n",
inet_ntoa(addr->sin_addr), ntohs(addr->sin_port)));
return 1;
}
char *
netsnmp_ipv4_fmtaddr(const char *prefix, netsnmp_transport *t,
const void *data, int len)
{
const netsnmp_indexed_addr_pair *addr_pair;
const struct sockaddr_in *from, *to;
struct hostent *host;
char *tmp;
if (t && !data) {
data = t->data;
len = t->data_length;
}
switch (data ? len : 0) {
case sizeof(netsnmp_indexed_addr_pair):
addr_pair = data;
break;
case sizeof(struct sockaddr_in): {
char a[16];
to = data;
if (asprintf(&tmp, "%s: [%s]:%hu", prefix,
inet_ntop(AF_INET, &to->sin_addr, a, sizeof(a)),
ntohs(to->sin_port)) < 0)
tmp = NULL;
return tmp;
}
default:
netsnmp_assert(0);
if (asprintf(&tmp, "%s: unknown", prefix) < 0)
tmp = NULL;
return tmp;
}
from = (const struct sockaddr_in *)&addr_pair->local_addr;
to = (const struct sockaddr_in *)&addr_pair->remote_addr;
netsnmp_assert(from->sin_family == 0 || from->sin_family == AF_INET);
netsnmp_assert(to->sin_family == 0 || to->sin_family == AF_INET);
if (t && t->flags & NETSNMP_TRANSPORT_FLAG_HOSTNAME) {
/* XXX: hmm... why isn't this prefixed */
/* assuming intentional */
host = netsnmp_gethostbyaddr(&to->sin_addr, sizeof(struct in_addr), AF_INET);
return (host ? strdup(host->h_name) : NULL);
} else {
char a1[16];
char a2[16];
if (asprintf(&tmp, "%s: [%s]:%hu->[%s]:%hu", prefix,
inet_ntop(AF_INET, &to->sin_addr, a1, sizeof(a1)),
ntohs(to->sin_port),
inet_ntop(AF_INET, &from->sin_addr, a2, sizeof(a2)),
ntohs(from->sin_port)) < 0)
tmp = NULL;
}
return tmp;
}
void netsnmp_ipv4_get_taddr(struct netsnmp_transport_s *t, void **addr,
size_t *addr_len)
{
struct sockaddr_in *sin = t->remote;
netsnmp_assert(t->remote_length == sizeof(*sin));
*addr_len = 6;
if ((*addr = malloc(*addr_len))) {
unsigned char *p = *addr;
memcpy(p, &sin->sin_addr, 4);
memcpy(p + 4, &sin->sin_port, 2);
}
}
int netsnmp_ipv4_ostring_to_sockaddr(struct sockaddr_in *sin, const void *o,
size_t o_len)
{
const char *p = o;
if (o_len != 6)
return 0;
memset(sin, 0, sizeof(*sin));
sin->sin_family = AF_INET;
memcpy(&sin->sin_addr, p + 0, 4);
memcpy(&sin->sin_port, p + 4, 2);
return 1;
}
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