/**
* check entry for update
*
*/
static void
_snarf_route_entry(netsnmp_route_entry *route_entry,
netsnmp_container *container)
{
ipCidrRouteTable_rowreq_ctx *rowreq_ctx;
DEBUGTRACE;
netsnmp_assert(NULL != route_entry);
netsnmp_assert(NULL != container);
/*
* allocate an row context and set the index(es), then add it to
* the container
*/
rowreq_ctx = ipCidrRouteTable_allocate_rowreq_ctx(route_entry, NULL);
if ((NULL != rowreq_ctx) &&
(MFD_SUCCESS == ipCidrRouteTable_indexes_set
(rowreq_ctx, *((in_addr_t *) route_entry->rt_dest),
route_entry->rt_mask, route_entry->rt_tos,
*((in_addr_t *) route_entry->rt_nexthop)))) {
CONTAINER_INSERT(container, rowreq_ctx);
rowreq_ctx->ipCidrRouteStatus = ROWSTATUS_ACTIVE;
} else {
if (rowreq_ctx) {
snmp_log(LOG_ERR, "error setting index while loading "
"ipCidrRoute cache.\n");
ipCidrRouteTable_release_rowreq_ctx(rowreq_ctx);
} else
netsnmp_access_route_entry_free(route_entry);
}
}
/**
* check entry for update
*/
static void
_snarf_route_entry(netsnmp_route_entry *route_entry,
netsnmp_container *container)
{
inetCidrRouteTable_rowreq_ctx *rowreq_ctx;
netsnmp_assert(NULL != route_entry);
netsnmp_assert(NULL != container);
/*
* per inetCidrRouteType:
*
* Routes which do not result in traffic forwarding or
* rejection should not be displayed even if the
* implementation keeps them stored internally.
*/
if (route_entry->rt_type == 0) { /* set when route not up */
DEBUGMSGT(("verbose:inetCidrRouteTable:inetCidrRouteTable_cache_load", "skipping route\n"));
netsnmp_access_route_entry_free(route_entry);
return;
}
/*
* allocate an row context and set the index(es), then add it to
* the container
*/
rowreq_ctx = inetCidrRouteTable_allocate_rowreq_ctx(route_entry, NULL);
if ((NULL != rowreq_ctx) &&
(MFD_SUCCESS == inetCidrRouteTable_indexes_set
(rowreq_ctx, route_entry->rt_dest_type,
(char *) route_entry->rt_dest, route_entry->rt_dest_len,
route_entry->rt_pfx_len,
route_entry->rt_policy, route_entry->rt_policy_len,
route_entry->rt_nexthop_type,
(char *) route_entry->rt_nexthop, route_entry->rt_nexthop_len))) {
CONTAINER_INSERT(container, rowreq_ctx);
rowreq_ctx->row_status = ROWSTATUS_ACTIVE;
} else {
if (rowreq_ctx) {
snmp_log(LOG_ERR, "error setting index while loading "
"inetCidrRoute cache.\n");
inetCidrRouteTable_release_rowreq_ctx(rowreq_ctx);
} else
netsnmp_access_route_entry_free(route_entry);
}
}
static int
_load_ipv4(netsnmp_container* container, u_long *index )
{
FILE *in;
char line[256];
netsnmp_route_entry *entry = NULL;
char name[16];
int fd;
DEBUGMSGTL(("access:route:container",
"route_container_arch_load ipv4\n"));
netsnmp_assert(NULL != container);
/*
* fetch routes from the proc file-system:
*/
if (!(in = fopen("/proc/net/route", "r"))) {
NETSNMP_LOGONCE((LOG_ERR, "cannot open /proc/net/route\n"));
return -2;
}
/*
* create socket for ioctls (see NOTE[1], below)
*/
fd = socket(AF_INET, SOCK_DGRAM, 0);
if(fd < 0) {
snmp_log(LOG_ERR, "could not create socket\n");
fclose(in);
return -2;
}
fgets(line, sizeof(line), in); /* skip header */
while (fgets(line, sizeof(line), in)) {
char rtent_name[32];
int refcnt, rc;
uint32_t dest, nexthop, mask;
unsigned flags, use;
entry = netsnmp_access_route_entry_create();
/*
* as with 1.99.14:
* Iface Dest GW Flags RefCnt Use Met Mask MTU Win IRTT
* BE eth0 00000000 C0A80101 0003 0 0 0 FFFFFFFF 1500 0 0
* LE eth0 00000000 0101A8C0 0003 0 0 0 00FFFFFF 0 0 0
*/
rc = sscanf(line, "%s %x %x %x %d %u %d %x %*d %*d %*d\n",
rtent_name, &dest, &nexthop,
/*
* XXX: fix type of the args
*/
&flags, &refcnt, &use, &entry->rt_metric1,
&mask);
DEBUGMSGTL(("9:access:route:container", "line |%s|\n", line));
if (8 != rc) {
snmp_log(LOG_ERR,
"/proc/net/route data format error (%d!=8), line ==|%s|",
rc, line);
netsnmp_access_route_entry_free(entry);
continue;
}
/*
* temporary null terminated name
*/
strlcpy(name, rtent_name, sizeof(name));
/*
* don't bother to try and get the ifindex for routes with
* no interface name.
* NOTE[1]: normally we'd use netsnmp_access_interface_index_find,
* but since that will open/close a socket, and we might
* have a lot of routes, call the ioctl routine directly.
*/
if ('*' != name[0])
entry->if_index =
netsnmp_access_interface_ioctl_ifindex_get(fd,name);
/*
* arbitrary index
*/
entry->ns_rt_index = ++(*index);
#ifdef USING_IP_FORWARD_MIB_IPCIDRROUTETABLE_IPCIDRROUTETABLE_MODULE
memcpy(&entry->rt_mask, &mask, 4);
/** entry->rt_tos = XXX; */
/** rt info ?? */
#endif
/*
* copy dest & next hop
*/
entry->rt_dest_type = INETADDRESSTYPE_IPV4;
entry->rt_dest_len = 4;
memcpy(entry->rt_dest, &dest, 4);
entry->rt_nexthop_type = INETADDRESSTYPE_IPV4;
entry->rt_nexthop_len = 4;
memcpy(entry->rt_nexthop, &nexthop, 4);
/*
* count bits in mask
*/
mask = htonl(mask);
entry->rt_pfx_len = netsnmp_ipaddress_ipv4_prefix_len(mask);
#ifdef USING_IP_FORWARD_MIB_INETCIDRROUTETABLE_INETCIDRROUTETABLE_MODULE
/*
inetCidrRoutePolicy OBJECT-TYPE
SYNTAX OBJECT IDENTIFIER
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This object is an opaque object without any defined
semantics. Its purpose is to serve as an additional
index which may delineate between multiple entries to
the same destination. The value { 0 0 } shall be used
as the default value for this object."
*/
/*
* on linux, default routes all look alike, and would have the same
* indexed based on dest and next hop. So we use the if index
* as the policy, to distinguise between them. Hopefully this is
* unique.
* xxx-rks: It should really only be for the duplicate case, but that
* would be more complicated than I want to get into now. Fix later.
*/
if (0 == nexthop) {
entry->rt_policy = calloc(3, sizeof(oid));
entry->rt_policy[2] = entry->if_index;
entry->rt_policy_len = sizeof(oid)*3;
}
#endif
/*
* get protocol and type from flags
*/
entry->rt_type = _type_from_flags(flags);
entry->rt_proto = (flags & RTF_DYNAMIC)
? IANAIPROUTEPROTOCOL_ICMP : IANAIPROUTEPROTOCOL_LOCAL;
/*
* insert into container
*/
if (CONTAINER_INSERT(container, entry) < 0)
{
DEBUGMSGTL(("access:route:container", "error with route_entry: insert into container failed.\n"));
netsnmp_access_route_entry_free(entry);
continue;
}
}
fclose(in);
close(fd);
return 0;
}
static int
_load_ipv6(netsnmp_container* container, u_long *index )
{
FILE *in;
char line[256];
netsnmp_route_entry *entry = NULL;
static int log_open_err = 1;
DEBUGMSGTL(("access:route:container",
"route_container_arch_load ipv6\n"));
netsnmp_assert(NULL != container);
/*
* fetch routes from the proc file-system:
*/
if (!(in = fopen("/proc/net/ipv6_route", "r"))) {
if (1 == log_open_err) {
NETSNMP_LOGONCE((LOG_ERR, "cannot open /proc/net/ipv6_route\n"));
log_open_err = 0;
}
return -2;
}
/*
* if we turned off logging of open errors, turn it back on now that
* we have been able to open the file.
*/
if (0 == log_open_err)
log_open_err = 1;
fgets(line,sizeof(line),in); /* skip header */
while (fgets(line, sizeof(line), in)) {
char c_name[IFNAMSIZ+1];
char c_dest[33], c_src[33], c_next[33];
int rc;
unsigned int dest_pfx, flags;
size_t buf_len, buf_offset;
u_char *temp_uchar_ptr;
entry = netsnmp_access_route_entry_create();
/*
* based on /usr/src/linux/net/ipv6/route.c, kernel 2.6.7:
*
* [ Dest addr / plen ]
* fe80000000000000025056fffec00008 80 \
*
* [ (?subtree) : src addr/plen : 0/0]
* 00000000000000000000000000000000 00 \
*
* [ next hop ][ metric ][ref ctn][ use ]
* 00000000000000000000000000000000 00000000 00000000 00000000 \
*
* [ flags ][dev name]
* 80200001 lo
*/
rc = sscanf(line, "%32s %2x %32s %*x %32s %x %*x %*x %x %"
SNMP_MACRO_VAL_TO_STR(IFNAMSIZ) "s\n",
c_dest, &dest_pfx, c_src, /*src_pfx,*/ c_next,
&entry->rt_metric1, /** ref,*/ /* use, */ &flags, c_name);
DEBUGMSGTL(("9:access:route:container", "line |%s|\n", line));
if (7 != rc) {
snmp_log(LOG_ERR,
"/proc/net/ipv6_route data format error (%d!=8), "
"line ==|%s|", rc, line);
continue;
}
/*
* temporary null terminated name
*/
c_name[ sizeof(c_name)-1 ] = 0;
entry->if_index = se_find_value_in_slist("interfaces", c_name);
if(SE_DNE == entry->if_index) {
snmp_log(LOG_ERR,"unknown interface in /proc/net/ipv6_route "
"('%s')\n", c_name);
netsnmp_access_route_entry_free(entry);
continue;
}
/*
* arbitrary index
*/
entry->ns_rt_index = ++(*index);
#ifdef USING_IP_FORWARD_MIB_IPCIDRROUTETABLE_IPCIDRROUTETABLE_MODULE
/** entry->rt_mask = mask; */ /* IPv4 only */
/** entry->rt_tos = XXX; */
/** rt info ?? */
#endif
/*
* convert hex addresses to binary
*/
entry->rt_dest_type = INETADDRESSTYPE_IPV6;
entry->rt_dest_len = 16;
buf_len = sizeof(entry->rt_dest);
buf_offset = 0;
temp_uchar_ptr = entry->rt_dest;
netsnmp_hex_to_binary(&temp_uchar_ptr, &buf_len, &buf_offset, 0,
c_dest, NULL);
entry->rt_nexthop_type = INETADDRESSTYPE_IPV6;
entry->rt_nexthop_len = 16;
buf_len = sizeof(entry->rt_nexthop);
buf_offset = 0;
temp_uchar_ptr = entry->rt_nexthop;
netsnmp_hex_to_binary(&temp_uchar_ptr, &buf_len, &buf_offset, 0,
c_next, NULL);
entry->rt_pfx_len = dest_pfx;
#ifdef USING_IP_FORWARD_MIB_INETCIDRROUTETABLE_INETCIDRROUTETABLE_MODULE
/*
inetCidrRoutePolicy OBJECT-TYPE
SYNTAX OBJECT IDENTIFIER
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This object is an opaque object without any defined
semantics. Its purpose is to serve as an additional
index which may delineate between multiple entries to
the same destination. The value { 0 0 } shall be used
as the default value for this object."
*/
/*
* on linux, default routes all look alike, and would have the same
* indexed based on dest and next hop. So we use our arbitrary index
* as the policy, to distinguish between them.
*/
entry->rt_policy = calloc(3, sizeof(oid));
entry->rt_policy[2] = entry->ns_rt_index;
entry->rt_policy_len = sizeof(oid)*3;
#endif
/*
* get protocol and type from flags
*/
entry->rt_type = _type_from_flags(flags);
entry->rt_proto = (flags & RTF_DYNAMIC)
? IANAIPROUTEPROTOCOL_ICMP : IANAIPROUTEPROTOCOL_LOCAL;
/*
* insert into container
*/
CONTAINER_INSERT(container, entry);
}
fclose(in);
return 0;
}
static int
_load_routing_table_from_sysctl(netsnmp_container* container, int *index,
int family)
{
char *buf, *lim, *next;
int mib[6];
size_t needed;
int err;
u_char dest_len, dest_type;
struct rt_msghdr *rtm;
buf = NULL;
err = 0;
if (family == AF_INET) {
dest_len = 4;
dest_type = INETADDRESSTYPE_IPV4;
} else if (family == AF_INET6) {
dest_len = 16;
dest_type = INETADDRESSTYPE_IPV6;
} else {
err = EINVAL;
goto out;
}
mib[0] = CTL_NET;
mib[1] = PF_ROUTE;
mib[2] = 0;
mib[3] = family;
mib[4] = NET_RT_DUMP;
mib[5] = 0;
if (sysctl(mib, (sizeof(mib) / sizeof(mib[0])), NULL, &needed, NULL,
0) == -1) {
err = errno;
goto out;
}
if ((buf = malloc(needed)) == NULL) {
err = ENOMEM;
goto out;
}
if (sysctl(mib, (sizeof(mib) / sizeof(mib[0])), buf, &needed, NULL,
0) == -1) {
err = errno;
goto out;
}
lim = buf + needed;
for (next = buf; next < lim; next += rtm->rtm_msglen) {
struct sockaddr *if_name = NULL, *if_addr = NULL;
struct sockaddr *dest_sa = NULL, *gateway_sa = NULL, *netmask_sa = NULL;
netsnmp_route_entry *entry;
char *addr_ptr;
rtm = (struct rt_msghdr*)next;
/*
* Some code in netstat checks for this ("netmasks done" case).
* Filter this out (I don't know why it should exist).
*/
if (rtm->rtm_addrs == RTA_DST)
continue;
entry = netsnmp_access_route_entry_create();
if (entry == NULL)
return -3;
memset(entry->rt_dest, 0, dest_len);
entry->rt_mask = 0;
memset(entry->rt_nexthop, 0, dest_len);
addr_ptr = (char *)(rtm + 1);
if (rtm->rtm_addrs & RTA_DST) {
dest_sa = (struct sockaddr *)addr_ptr;
addr_ptr += SA_SIZE(dest_sa);
}
if (rtm->rtm_addrs & RTA_GATEWAY) {
gateway_sa = (struct sockaddr *)addr_ptr;
addr_ptr += SA_SIZE(gateway_sa);
}
if (rtm->rtm_addrs & RTA_NETMASK) {
netmask_sa = (struct sockaddr *)addr_ptr;
addr_ptr += SA_SIZE(netmask_sa);
}
if (rtm->rtm_addrs & RTA_IFP) {
if_name = (struct sockaddr *)addr_ptr;
addr_ptr += SA_SIZE(if_name);
}
if (rtm->rtm_addrs & RTA_IFA) {
if_addr = (struct sockaddr *)addr_ptr;
addr_ptr += SA_SIZE(if_addr);
}
entry->if_index = rtm->rtm_index;
/* arbitrary index */
entry->ns_rt_index = ++(*index);
/* copy dest & next hop */
entry->rt_dest_type = dest_type;
entry->rt_dest_len = dest_len;
if (rtm->rtm_addrs & RTA_DST) {
if (family == AF_INET)
memcpy(entry->rt_dest,
&((struct sockaddr_in*)dest_sa)->sin_addr, dest_len);
#ifdef NETSNMP_ENABLE_IPV6
if (family == AF_INET6)
memcpy(entry->rt_dest,
&((struct sockaddr_in6*)dest_sa)->sin6_addr, dest_len);
#endif
}
entry->rt_nexthop_type = dest_type;
entry->rt_nexthop_len = dest_len;
if (rtm->rtm_addrs & RTA_GATEWAY) {
if (family == AF_INET)
memcpy(entry->rt_nexthop,
&((struct sockaddr_in*)gateway_sa)->sin_addr, dest_len);
#ifdef NETSNMP_ENABLE_IPV6
if (family == AF_INET6)
memcpy(entry->rt_nexthop,
&((struct sockaddr_in6*)gateway_sa)->sin6_addr, dest_len);
#endif
}
else {
if (family == AF_INET)
memcpy(entry->rt_nexthop,
&((struct sockaddr_in*)if_addr)->sin_addr, dest_len);
#ifdef NETSNMP_ENABLE_IPV6
if (family == AF_INET6)
memcpy(entry->rt_nexthop,
&((struct sockaddr_in6*)if_addr)->sin6_addr, dest_len);
#endif
}
if (family == AF_INET) {
if (netmask_sa) {
/* count bits in mask */
entry->rt_pfx_len = netsnmp_ipaddress_ipv4_prefix_len(
((struct sockaddr_in *)netmask_sa)->sin_addr.s_addr);
memcpy(&entry->rt_mask, &((struct sockaddr_in *)netmask_sa)->sin_addr, 4);
}
else {
entry->rt_pfx_len = 32;
}
}
#ifdef NETSNMP_ENABLE_IPV6
if (family == AF_INET6) {
if (netmask_sa) {
/* count bits in mask */
entry->rt_pfx_len = netsnmp_ipaddress_ipv6_prefix_len(
((struct sockaddr_in6 *)netmask_sa)->sin6_addr);
memcpy(&entry->rt_mask, &((struct sockaddr_in6 *)netmask_sa)->sin6_addr, 16);
}
else {
entry->rt_pfx_len = 128;
}
}
#endif
#ifdef USING_IP_FORWARD_MIB_INETCIDRROUTETABLE_INETCIDRROUTETABLE_MODULE
/*
inetCidrRoutePolicy OBJECT-TYPE
SYNTAX OBJECT IDENTIFIER
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This object is an opaque object without any defined
semantics. Its purpose is to serve as an additional
index which may delineate between multiple entries to
the same destination. The value { 0 0 } shall be used
as the default value for this object."
*/
entry->rt_policy = calloc(3, sizeof(oid));
entry->rt_policy[2] = entry->if_index;
entry->rt_policy_len = sizeof(oid)*3;
#endif
entry->rt_type = _type_from_flags(rtm->rtm_flags);
entry->rt_age = rtm->rtm_rmx.rmx_expire;
entry->rt_nexthop_as = 0;
/* entry->rt_metric1 = rtm->rtm_rmx.rmx_hopcount; */
if (rtm->rtm_flags & RTF_DYNAMIC)
entry->rt_proto = IANAIPROUTEPROTOCOL_ICMP;
else if (rtm->rtm_flags & RTF_STATIC)
entry->rt_proto = IANAIPROUTEPROTOCOL_NETMGMT;
#ifdef RTF_LOCAL
else if (rtm->rtm_flags & RTF_LOCAL)
entry->rt_proto = IANAIPROUTEPROTOCOL_LOCAL;
#endif
else
entry->rt_proto = IANAIPROUTEPROTOCOL_OTHER;
if (CONTAINER_INSERT(container, entry) < 0) {
DEBUGMSGTL(("access:route:container",
"error with route_entry: insert into container failed.\n"));
netsnmp_access_route_entry_free(entry);
continue;
}
}
out:
free(buf);
return err;
}
void
_access_route_entry_release(netsnmp_route_entry * entry, void *context)
{
netsnmp_access_route_entry_free(entry);
}