blob: 9f4b6a9cc924949217699381f5a65d6de988ac07 [file] [log] [blame]
/* IPV4 base transport support functions
*/
#include <net-snmp/net-snmp-config.h>
#include <net-snmp/types.h>
#include <net-snmp/library/snmpIPv4BaseDomain.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
#if HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#if HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#if HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#if 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>
#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)
{
int ret;
if (addr == NULL) {
return 0;
}
DEBUGMSGTL(("netsnmp_sockaddr_in",
"addr %p, inpeername \"%s\", default_target \"%s\"\n",
addr, inpeername ? inpeername : "[NIL]",
default_target ? default_target : "[NIL]"));
memset(addr, 0, sizeof(struct sockaddr_in));
addr->sin_addr.s_addr = htonl(INADDR_ANY);
addr->sin_family = AF_INET;
addr->sin_port = htons((u_short)SNMP_PORT);
{
int port = netsnmp_ds_get_int(NETSNMP_DS_LIBRARY_ID,
NETSNMP_DS_LIB_DEFAULT_PORT);
if (port != 0) {
addr->sin_port = htons((u_short)port);
} else if (default_target != NULL)
netsnmp_sockaddr_in2(addr, default_target, NULL);
}
if (inpeername != NULL && *inpeername != '\0') {
const char *host, *port;
char *peername = NULL;
char *cp;
/*
* Duplicate the peername because we might want to mank around with
* it.
*/
peername = strdup(inpeername);
if (peername == NULL) {
return 0;
}
/*
* Try and extract an appended port number.
*/
cp = strchr(peername, ':');
if (cp != NULL) {
*cp = '\0';
port = cp + 1;
host = peername;
} else {
host = NULL;
port = peername;
}
/*
* Try to convert the user port specifier
*/
if (port && *port == '\0')
port = NULL;
if (port != NULL) {
long int l;
char* ep;
DEBUGMSGTL(("netsnmp_sockaddr_in", "check user service %s\n",
port));
l = strtol(port, &ep, 10);
if (ep != port && *ep == '\0' && 0 <= l && l <= 0x0ffff)
addr->sin_port = htons((u_short)l);
else {
if (host == NULL) {
DEBUGMSGTL(("netsnmp_sockaddr_in",
"servname not numeric, "
"check if it really is a destination)\n"));
host = port;
port = NULL;
} else {
DEBUGMSGTL(("netsnmp_sockaddr_in",
"servname not numeric\n"));
free(peername);
return 0;
}
}
}
/*
* Try to convert the user host specifier
*/
if (host && *host == '\0')
host = NULL;
if (host != NULL) {
DEBUGMSGTL(("netsnmp_sockaddr_in",
"check destination %s\n", host));
if (strcmp(peername, "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 {
ret =
netsnmp_gethostbyname_v4(peername, &addr->sin_addr.s_addr);
if (ret < 0) {
DEBUGMSGTL(("netsnmp_sockaddr_in",
"couldn't resolve hostname\n"));
free(peername);
return 0;
}
DEBUGMSGTL(("netsnmp_sockaddr_in",
"hostname (resolved okay)\n"));
}
}
free(peername);
}
/*
* 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,
void *data, int len)
{
netsnmp_indexed_addr_pair *addr_pair = NULL;
struct hostent *host;
char tmp[64];
if (data != NULL && len == sizeof(netsnmp_indexed_addr_pair)) {
addr_pair = (netsnmp_indexed_addr_pair *) data;
} else if (t != NULL && t->data != NULL) {
addr_pair = (netsnmp_indexed_addr_pair *) t->data;
}
if (addr_pair == NULL) {
snprintf(tmp, sizeof(tmp), "%s: unknown", prefix);
} else {
struct sockaddr_in *to = NULL;
to = (struct sockaddr_in *) &(addr_pair->remote_addr);
if (to == NULL) {
snprintf(tmp, sizeof(tmp), "%s: unknown->[%s]:%hu", prefix,
inet_ntoa(addr_pair->local_addr.sin_addr),
ntohs(addr_pair->local_addr.sin_port));
} else if ( t && t->flags & NETSNMP_TRANSPORT_FLAG_HOSTNAME ) {
/* XXX: hmm... why isn't this prefixed */
/* assuming intentional */
host = gethostbyaddr((char *)&to->sin_addr, 4, AF_INET);
return (host ? strdup(host->h_name) : NULL);
} else {
snprintf(tmp, sizeof(tmp), "%s: [%s]:%hu->", prefix,
inet_ntoa(to->sin_addr), ntohs(to->sin_port));
snprintf(tmp + strlen(tmp), sizeof(tmp)-strlen(tmp), "[%s]:%hu",
inet_ntoa(addr_pair->local_addr.sin_addr),
ntohs(addr_pair->local_addr.sin_port));
}
}
tmp[sizeof(tmp)-1] = '\0';
return strdup(tmp);
}