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net-snmp/snmplib/transports/snmpAAL5PVCDomain.c

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#include <net-snmp/net-snmp-config.h>
#include <net-snmp/library/snmpAAL5PVCDomain.h>
#include <stdio.h>
#include <sys/types.h>
#include <ctype.h>
#include <errno.h>
#if HAVE_STRING_H
#include <string.h>
#else
#include <strings.h>
#endif
#if HAVE_STDLIB_H
#include <stdlib.h>
#endif
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#if HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#include <atm.h>
#if HAVE_DMALLOC_H
#include <dmalloc.h>
#endif
#include <net-snmp/types.h>
#include <net-snmp/output_api.h>
#include <net-snmp/config_api.h>
#include <net-snmp/library/snmp_transport.h>
#include <net-snmp/library/tools.h>
oid netsnmp_AAL5PVCDomain[10] = { NETSNMP_ENTERPRISE_MIB, 3, 3, 3 };
static netsnmp_tdomain aal5pvcDomain;
/*
* Return a string representing the address in data, or else the "far end"
* address if data is NULL.
*/
static char *
netsnmp_aal5pvc_fmtaddr(netsnmp_transport *t, const void *data, int len)
{
const struct sockaddr_atmpvc *to = NULL;
if (data != NULL && len == sizeof(struct sockaddr_atmpvc)) {
to = (const struct sockaddr_atmpvc *) data;
} else if (t != NULL && t->data != NULL &&
t->data_length == sizeof(struct sockaddr_atmpvc)) {
to = (const struct sockaddr_atmpvc *) t->data;
}
if (to == NULL) {
return strdup("AAL5 PVC: unknown");
} else {
char *tmp;
if (asprintf(&tmp, "AAL5 PVC: %hd.%hd.%d", to->sap_addr.itf,
to->sap_addr.vpi, to->sap_addr.vci) < 0)
tmp = NULL;
return tmp;
}
}
static void
netsnmp_aal5pvc_get_taddr(netsnmp_transport *t, void **addr, size_t *addr_len)
{
struct sockaddr_atmpvc *sa = t->remote;
unsigned char *p;
*addr_len = 8;
if (!(*addr = malloc(*addr_len)))
return;
p = *addr;
p[0] = sa->sap_addr.itf >> 8;
p[1] = sa->sap_addr.itf >> 0;
p[2] = sa->sap_addr.vpi >> 8;
p[3] = sa->sap_addr.vpi >> 0;
p[4] = sa->sap_addr.vci >> 24;
p[5] = sa->sap_addr.vci >> 16;
p[6] = sa->sap_addr.vci >> 8;
p[7] = sa->sap_addr.vci >> 0;
}
/*
* You can write something into opaque that will subsequently get passed back
* to your send function if you like. For instance, you might want to
* remember where a PDU came from, so that you can send a reply there...
*/
static int
netsnmp_aal5pvc_recv(netsnmp_transport *t, void *buf, int size,
void **opaque, int *olength)
{
int rc = -1;
if (t != NULL && t->sock >= 0) {
while (rc < 0) {
rc = recvfrom(t->sock, buf, size, 0, NULL, NULL);
if (rc < 0 && errno != EINTR) {
break;
}
}
if (rc >= 0) {
DEBUGIF("netsnmp_aal5pvc") {
char *str = netsnmp_aal5pvc_fmtaddr(t, NULL, 0);
DEBUGMSGTL(("netsnmp_aal5pvc",
"recv on fd %d got %d bytes (from %s)\n", t->sock,
rc, str));
free(str);
}
} else {
DEBUGMSGTL(("netsnmp_aal5pvc", "recv on fd %d err %d (\"%s\")\n",
t->sock, errno, strerror(errno)));
}
*opaque = NULL;
*olength = 0;
}
return rc;
}
static int
netsnmp_aal5pvc_send(netsnmp_transport *t, const void *buf, int size,
void **opaque, int *olength)
{
int rc = -1;
const struct sockaddr *to = NULL;
if (opaque != NULL && *opaque != NULL &&
*olength == sizeof(struct sockaddr_atmpvc)) {
to = (const struct sockaddr *) (*opaque);
} else if (t != NULL && t->data != NULL &&
t->data_length == sizeof(struct sockaddr_atmpvc)) {
to = (const struct sockaddr *) (t->data);
}
if (to != NULL && t != NULL && t->sock >= 0) {
DEBUGIF("netsnmp_aal5pvc") {
char *str = netsnmp_aal5pvc_fmtaddr(NULL, to,
sizeof(struct sockaddr_atmpvc));
DEBUGMSGTL(("netsnmp_aal5pvc",
"send %d bytes from %p to %s on fd %d\n",
size, buf, str, t->sock));
free(str);
}
while (rc < 0) {
rc = sendto(t->sock, buf, size, 0, NULL, 0);
if (rc < 0 && errno != EINTR) {
break;
}
}
}
return rc;
}
static int
netsnmp_aal5pvc_close(netsnmp_transport *t)
{
int rc = -1;
if (t->sock >= 0) {
DEBUGMSGTL(("netsnmp_aal5pvc", "close fd %d\n", t->sock));
#ifndef HAVE_CLOSESOCKET
rc = close(t->sock);
#else
rc = closesocket(t->sock);
#endif
t->sock = -1;
}
return rc;
}
/*
* Open an AAL5 PVC transport for SNMP. Local is TRUE if addr is the local
* NSAP to bind to (i.e. this is a server-type session); otherwise addr is
* the remote NSAP to send things to.
*/
netsnmp_transport *
netsnmp_aal5pvc_transport(const struct sockaddr_atmpvc *addr, int local)
{
netsnmp_transport *t = NULL;
#ifdef NETSNMP_NO_LISTEN_SUPPORT
if (local)
return NULL;
#endif /* NETSNMP_NO_LISTEN_SUPPORT */
if (addr == NULL || addr->sap_family != AF_ATMPVC) {
return NULL;
}
t = SNMP_MALLOC_TYPEDEF(netsnmp_transport);
if (t == NULL) {
return NULL;
}
DEBUGIF("netsnmp_aal5pvc") {
char *str = netsnmp_aal5pvc_fmtaddr(NULL, addr,
sizeof(struct sockaddr_atmpvc));
DEBUGMSGTL(("netsnmp_aal5pvc", "open %s %s\n",
local ? "local" : "remote", str));
free(str);
}
t->domain = netsnmp_AAL5PVCDomain;
t->domain_length =
sizeof(netsnmp_AAL5PVCDomain) / sizeof(netsnmp_AAL5PVCDomain[0]);
t->sock = socket(PF_ATMPVC, SOCK_DGRAM, 0);
if (t->sock < 0) {
DEBUGMSGTL(("netsnmp_aal5pvc","socket failed (%s)\n",strerror(errno)));
netsnmp_transport_free(t);
return NULL;
}
DEBUGMSGTL(("netsnmp_aal5pvc", "fd %d opened\n", t->sock));
{
/*
* Set up the QOS parameters.
*/
struct atm_qos qos = { 0 };
qos.aal = ATM_AAL5;
qos.rxtp.traffic_class = ATM_UBR;
qos.rxtp.max_sdu = SNMP_MAX_LEN; /* Hmm -- this is a bit small? */
qos.txtp = qos.rxtp;
if (setsockopt(t->sock, SOL_ATM, SO_ATMQOS, &qos, sizeof(qos)) < 0) {
DEBUGMSGTL(("netsnmp_aal5pvc", "setsockopt failed (%s)\n",
strerror(errno)));
netsnmp_aal5pvc_close(t);
netsnmp_transport_free(t);
return NULL;
}
}
if (local) {
#ifndef NETSNMP_NO_LISTEN_SUPPORT
t->local_length = sizeof(*addr);
t->local = netsnmp_memdup(addr, sizeof(*addr));
if (t->local == NULL) {
netsnmp_transport_free(t);
return NULL;
}
if (bind(t->sock, (const struct sockaddr *)addr,
sizeof(struct sockaddr_atmpvc)) < 0) {
DEBUGMSGTL(("netsnmp_aal5pvc", "bind failed (%s)\n",
strerror(errno)));
netsnmp_aal5pvc_close(t);
netsnmp_transport_free(t);
return NULL;
}
#else /* NETSNMP_NO_LISTEN_SUPPORT */
return NULL;
#endif /* NETSNMP_NO_LISTEN_SUPPORT */
} else {
t->remote_length = sizeof(*addr);
t->remote = netsnmp_memdup(addr, sizeof(*addr));
if (t->remote == NULL) {
netsnmp_transport_free(t);
return NULL;
}
if (connect(t->sock, (const struct sockaddr *)addr,
sizeof(struct sockaddr_atmpvc)) < 0) {
DEBUGMSGTL(("netsnmp_aal5pvc", "connect failed (%s)\n",
strerror(errno)));
netsnmp_aal5pvc_close(t);
netsnmp_transport_free(t);
return NULL;
}
}
t->data = malloc(sizeof(struct sockaddr_atmpvc));
if (t->data == NULL) {
netsnmp_transport_free(t);
return NULL;
}
memcpy(t->data, addr, sizeof(struct sockaddr_atmpvc));
t->data_length = sizeof(struct sockaddr_atmpvc);
/*
* 16-bit length field in the trailer, no headers.
*/
t->msgMaxSize = 0xffff;
t->f_recv = netsnmp_aal5pvc_recv;
t->f_send = netsnmp_aal5pvc_send;
t->f_close = netsnmp_aal5pvc_close;
t->f_accept = NULL;
t->f_fmtaddr = netsnmp_aal5pvc_fmtaddr;
t->f_get_taddr = netsnmp_aal5pvc_get_taddr;
return t;
}
netsnmp_transport *
netsnmp_aal5pvc_create_tstring(const char *str, int local,
const char *default_target)
{
struct sockaddr_atmpvc addr;
if (str == NULL || *str == '\0')
str = default_target;
if (str != NULL) {
addr.sap_family = AF_ATMPVC;
if (sscanf(str, "%hd.%hd.%d", &(addr.sap_addr.itf),
&(addr.sap_addr.vpi), &(addr.sap_addr.vci)) == 3) {
return netsnmp_aal5pvc_transport(&addr, local);
} else if (sscanf(str, "%hd.%d", &(addr.sap_addr.vpi),
&(addr.sap_addr.vci)) == 2) {
addr.sap_addr.itf = 0;
return netsnmp_aal5pvc_transport(&addr, local);
} else if (sscanf(str, "%d", &(addr.sap_addr.vci)) == 1) {
addr.sap_addr.itf = 0;
addr.sap_addr.vpi = 0;
return netsnmp_aal5pvc_transport(&addr, local);
} else {
return NULL;
}
} else {
return NULL;
}
}
static int netsnmp_aal5pvc_ostring_to_sockaddr(struct sockaddr_atmpvc *sa,
const void *o, size_t o_len)
{
const unsigned char *p = o;
if (o_len != 8)
return 0;
memset(sa, 0, sizeof(*sa));
sa->sap_family = AF_ATMPVC;
sa->sap_addr.itf = (p[0] << 8) + (p[1] << 0);
sa->sap_addr.vpi = (p[2] << 8) + (p[3] << 0);
sa->sap_addr.vci = (p[4] << 24) + (p[5] << 16) + (p[6] << 8) + (p[7] << 0);
return 1;
}
netsnmp_transport *
netsnmp_aal5pvc_create_ostring(const void *o, size_t o_len, int local)
{
struct sockaddr_atmpvc sa;
if (netsnmp_aal5pvc_ostring_to_sockaddr(&sa, o, o_len))
return netsnmp_aal5pvc_transport(&sa, local);
return NULL;
}
void
netsnmp_aal5pvc_ctor(void)
{
aal5pvcDomain.name = netsnmp_AAL5PVCDomain;
aal5pvcDomain.name_length = sizeof(netsnmp_AAL5PVCDomain) / sizeof(oid);
aal5pvcDomain.prefix = (const char**)calloc(3, sizeof(char *));
aal5pvcDomain.prefix[0] = "aal5pvc";
aal5pvcDomain.prefix[1] = "pvc";
aal5pvcDomain.f_create_from_tstring = NULL;
aal5pvcDomain.f_create_from_tstring_new = netsnmp_aal5pvc_create_tstring;
aal5pvcDomain.f_create_from_ostring = netsnmp_aal5pvc_create_ostring;
netsnmp_tdomain_register(&aal5pvcDomain);
}
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