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config.c
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/*
* Copyright (c) 1998-2001
* University of Southern California/Information Sciences Institute.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* Part of this program has been derived from mrouted.
* The mrouted program is covered by the license in the accompanying file
* named "LICENSE.mrouted".
*
* The mrouted program is COPYRIGHT 1989 by The Board of Trustees of
* Leland Stanford Junior University.
*
*/
#include "defs.h"
#define WARN(fmt, args...) logit(LOG_WARNING, 0, "%s:%u - " fmt, config_file, lineno, ##args)
#define BAILOUT(msg, arg...) { WARN(msg ", bailing out!", ##arg); return FALSE; }
#define IGNORING(msg, arg...) { WARN(msg ", ignoring ...", ##arg); continue; }
/* Helper macros */
#define QUERIER_TIMEOUT(qintv) (IGMP_ROBUSTNESS_VARIABLE * (qintv) + IGMP_QUERY_RESPONSE_INTERVAL / 2)
#define LINE_BUFSIZ 1024 /* Max. line length of the config file */
#define CONF_UNKNOWN -1
#define CONF_EMPTY 1
#define CONF_PHYINT 2
#define CONF_CANDIDATE_RP 3
#define CONF_RP_ADDRESS 4
#define CONF_GROUP_PREFIX 5
#define CONF_BOOTSTRAP_RP 6
#define CONF_COMPAT_THRESHOLD 7
#define CONF_SPT_THRESHOLD 8
#define CONF_DEFAULT_SOURCE_METRIC 9
#define CONF_DEFAULT_SOURCE_PREFERENCE 10
#define CONF_ALTNET 11
#define CONF_MASKLEN 12
#define CONF_SCOPED 13
#define CONF_DEFAULT_IGMP_QUERY_INTERVAL 14
#define CONF_DEFAULT_IGMP_QUERIER_TIMEOUT 15
/*
* Forward declarations.
*/
static char *next_word (char **);
static int parse_phyint (char *s);
static uint32_t ifname2addr (char *s);
static uint32_t lineno;
extern struct rp_hold *g_rp_hold;
/*
* Query the kernel to find network interfaces that are multicast-capable
* and install them in the uvifs array.
*/
void config_vifs_from_kernel(void)
{
struct ifreq *ifrp, *ifend;
struct uvif *v;
vifi_t vifi;
uint32_t n;
uint32_t addr, mask, subnet;
short flags;
int num_ifreq = 64;
struct ifconf ifc;
char *newbuf;
total_interfaces = 0; /* The total number of physical interfaces */
ifc.ifc_len = num_ifreq * sizeof(struct ifreq);
ifc.ifc_buf = calloc(ifc.ifc_len, sizeof(char));
while (ifc.ifc_buf) {
if (ioctl(udp_socket, SIOCGIFCONF, (char *)&ifc) < 0)
logit(LOG_ERR, errno, "Failed querying kernel network interfaces");
/*
* If the buffer was large enough to hold all the addresses
* then break out, otherwise increase the buffer size and
* try again.
*
* The only way to know that we definitely had enough space
* is to know that there was enough space for at least one
* more struct ifreq. ???
*/
if ((num_ifreq * sizeof(struct ifreq)) >= ifc.ifc_len + sizeof(struct ifreq))
break;
num_ifreq *= 2;
ifc.ifc_len = num_ifreq * sizeof(struct ifreq);
newbuf = realloc(ifc.ifc_buf, ifc.ifc_len);
if (newbuf == NULL)
free(ifc.ifc_buf);
ifc.ifc_buf = newbuf;
}
if (ifc.ifc_buf == NULL)
logit(LOG_ERR, 0, "config_vifs_from_kernel() ran out of memory");
ifrp = (struct ifreq *)ifc.ifc_buf;
ifend = (struct ifreq *)(ifc.ifc_buf + ifc.ifc_len);
/*
* Loop through all of the interfaces.
*/
for (; ifrp < ifend; ifrp = (struct ifreq *)((char *)ifrp + n)) {
struct ifreq ifr;
memset (&ifr, 0, sizeof (ifr));
#ifdef HAVE_SA_LEN
n = ifrp->ifr_addr.sa_len + sizeof(ifrp->ifr_name);
if (n < sizeof(*ifrp))
n = sizeof(*ifrp);
#else
n = sizeof(*ifrp);
#endif /* HAVE_SA_LEN */
/*
* Ignore any interface for an address family other than IP.
*/
if (ifrp->ifr_addr.sa_family != AF_INET) {
total_interfaces++; /* Eventually may have IP address later */
continue;
}
addr = ((struct sockaddr_in *)&ifrp->ifr_addr)->sin_addr.s_addr;
/*
* Need a template to preserve address info that is
* used below to locate the next entry. (Otherwise,
* SIOCGIFFLAGS stomps over it because the requests
* are returned in a union.)
*/
memcpy(ifr.ifr_name, ifrp->ifr_name, sizeof(ifr.ifr_name));
/*
* Ignore loopback interfaces and interfaces that do not
* support multicast.
*/
if (ioctl(udp_socket, SIOCGIFFLAGS, (char *)&ifr) < 0)
logit(LOG_ERR, errno, "Failed reading interface flags for phyint %s", ifr.ifr_name);
flags = ifr.ifr_flags;
if ((flags & (IFF_LOOPBACK | IFF_MULTICAST)) != IFF_MULTICAST)
continue;
/*
* Everyone below is a potential vif interface.
* We don't care if it has wrong configuration or not configured
* at all.
*/
total_interfaces++;
/*
* Ignore any interface whose address and mask do not define a
* valid subnet number, or whose address is of the form
* {subnet,0} or {subnet,-1}.
*/
if (ioctl(udp_socket, SIOCGIFNETMASK, (char *)&ifr) < 0) {
if (!(flags & IFF_POINTOPOINT))
logit(LOG_ERR, errno, "Failed reading interface netmask for phyint %s", ifr.ifr_name);
mask = 0xffffffff;
} else {
mask = ((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr.s_addr;
}
subnet = addr & mask;
if ((!inet_valid_subnet(subnet, mask)) || (addr == subnet) || addr == (subnet | ~mask)) {
if (!(inet_valid_host(addr) && ((mask == htonl(0xfffffffe)) || (flags & IFF_POINTOPOINT)))) {
logit(LOG_WARNING, 0, "Ignoring %s, has invalid address %s and/or netmask %s",
ifr.ifr_name, inet_fmt(addr, s1, sizeof(s1)), inet_fmt(mask, s2, sizeof(s2)));
continue;
}
}
/*
* Ignore any interface that is connected to the same subnet as
* one already installed in the uvifs array.
*/
/*
* TODO: XXX: bug or "feature" is to allow only one interface per
* subnet?
*/
for (vifi = 0, v = uvifs; vifi < numvifs; ++vifi, ++v) {
if (strcmp(v->uv_name, ifr.ifr_name) == 0) {
logit(LOG_DEBUG, 0, "Ignoring %s (%s on subnet %s) (alias for vif#%u?)",
v->uv_name, inet_fmt(addr, s1, sizeof(s1)), netname(subnet, mask), vifi);
break;
}
/* we don't care about point-to-point links in same subnet */
if (flags & IFF_POINTOPOINT)
continue;
if (v->uv_flags & VIFF_POINT_TO_POINT)
continue;
#if 0
/*
* TODO: to allow different interfaces belong to
* overlapping subnet addresses, use this version instead
*/
if (((addr & mask ) == v->uv_subnet) && (v->uv_subnetmask == mask)) {
logit(LOG_WARNING, 0, "Ignoring %s, same subnet as %s", ifr.ifr_name, v->uv_name);
break;
}
#else
if ((addr & v->uv_subnetmask) == v->uv_subnet || (v->uv_subnet & mask) == subnet) {
logit(LOG_WARNING, 0, "Ignoring %s, same subnet as %s", ifr.ifr_name, v->uv_name);
break;
}
#endif /* 0 */
}
if (vifi != numvifs)
continue;
/*
* If there is room in the uvifs array, install this interface.
*/
if (numvifs == MAXVIFS) {
logit(LOG_WARNING, 0, "Too many vifs, ignoring %s", ifr.ifr_name);
continue;
}
v = &uvifs[numvifs];
zero_vif(v, FALSE);
v->uv_lcl_addr = addr;
v->uv_subnet = subnet;
v->uv_subnetmask = mask;
if (mask != htonl(0xfffffffe))
v->uv_subnetbcast = subnet | ~mask;
else
v->uv_subnetbcast = 0xffffffff;
strlcpy(v->uv_name, ifr.ifr_name, IFNAMSIZ);
/*
* Figure out MTU of interface, needed as a seed value when
* fragmenting PIM register messages. We should really do
* a PMTU check on initial PIM register send to a new RP...
*/
if (ioctl(udp_socket, SIOCGIFMTU, &ifr) < 0)
v->uv_mtu = 1500;
else
v->uv_mtu = ifr.ifr_mtu;
if (flags & IFF_POINTOPOINT) {
v->uv_flags |= (VIFF_REXMIT_PRUNES | VIFF_POINT_TO_POINT);
if (ioctl(udp_socket, SIOCGIFDSTADDR, (char *)&ifr) < 0)
logit(LOG_ERR, errno, "Failed reading point-to-point address for %s", v->uv_name);
else
v->uv_rmt_addr = ((struct sockaddr_in *)(&ifr.ifr_dstaddr))->sin_addr.s_addr;
} else if (mask == htonl(0xfffffffe)) {
/*
* Handle RFC 3021 /31 netmasks as point-to-point links
*/
v->uv_flags |= (VIFF_REXMIT_PRUNES | VIFF_POINT_TO_POINT);
if (addr == subnet)
v->uv_rmt_addr = addr + htonl(1);
else
v->uv_rmt_addr = subnet;
}
#ifdef __linux__
{
struct ifreq ifridx;
memset(&ifridx, 0, sizeof(ifridx));
strlcpy(ifridx.ifr_name,v->uv_name, IFNAMSIZ);
if (ioctl(udp_socket, SIOGIFINDEX, (char *) &ifridx) < 0)
logit(LOG_ERR, errno, "Failed reading interface index for %s", ifridx.ifr_name);
v->uv_ifindex = ifridx.ifr_ifindex;
}
if (v->uv_flags & VIFF_POINT_TO_POINT) {
logit(LOG_INFO, 0, "Installing %s (%s -> %s) as vif #%u-%d - rate %d",
v->uv_name, inet_fmt(addr, s1, sizeof(s1)), inet_fmt(v->uv_rmt_addr, s2, sizeof(s2)),
numvifs, v->uv_ifindex, v->uv_rate_limit);
} else {
logit(LOG_INFO, 0, "Installing %s (%s on subnet %s) as vif #%u-%d - rate %d",
v->uv_name, inet_fmt(addr, s1, sizeof(s1)), netname(subnet, mask),
numvifs, v->uv_ifindex, v->uv_rate_limit);
}
#else /* !__linux__ */
if (v->uv_flags & VIFF_POINT_TO_POINT) {
logit(LOG_INFO, 0, "Installing %s (%s -> %s) as vif #%u - rate=%d",
v->uv_name, inet_fmt(addr, s1, sizeof(s1)), inet_fmt(v->uv_rmt_addr, s2, sizeof(s2)),
numvifs, v->uv_rate_limit);
} else {
logit(LOG_INFO, 0, "Installing %s (%s on subnet %s) as vif #%u - rate %d",
v->uv_name, inet_fmt(addr, s1, sizeof(s1)), netname(subnet, mask),
numvifs, v->uv_rate_limit);
}
#endif /* __linux__ */
++numvifs;
/*
* If the interface is not yet up, set the vifs_down flag to
* remind us to check again later.
*/
if (!(flags & IFF_UP)) {
v->uv_flags |= VIFF_DOWN;
vifs_down = TRUE;
}
}
}
static int deprecated(char *word, char *new_word, int code)
{
WARN("The %s option is deprecated, replaced with %s", word, new_word);
WARN("Please update your configuration file!");
return code;
}
/**
* parse_option - Convert result of string comparisons into numerics.
* @input: Pointer to the word
*
* This function is called by config_vifs_from_file().
*
* Returns:
* A number corresponding to the code of the word, or %CONF_UNKNOWN.
*/
static int parse_option(char *word)
{
if (EQUAL(word, ""))
return CONF_EMPTY;
if (EQUAL(word, "phyint"))
return CONF_PHYINT;
if (EQUAL(word, "cand_rp"))
return CONF_CANDIDATE_RP;
if (EQUAL(word, "rp_address"))
return CONF_RP_ADDRESS;
if (EQUAL(word, "group_prefix"))
return CONF_GROUP_PREFIX;
if (EQUAL(word, "cand_bootstrap_router"))
return CONF_BOOTSTRAP_RP;
if (EQUAL(word, "switch_register_threshold"))
return deprecated(word, "spt_threshold", CONF_COMPAT_THRESHOLD);
if (EQUAL(word, "switch_data_threshold"))
return deprecated(word, "spt_threshold", CONF_COMPAT_THRESHOLD);
if (EQUAL(word, "spt_threshold"))
return CONF_SPT_THRESHOLD;
if (EQUAL(word, "default_source_metric"))
return CONF_DEFAULT_SOURCE_METRIC;
if (EQUAL(word, "default_source_preference"))
return CONF_DEFAULT_SOURCE_PREFERENCE;
if (EQUAL(word, "default_igmp_query_interval"))
return CONF_DEFAULT_IGMP_QUERY_INTERVAL;
if (EQUAL(word, "default_igmp_querier_timeout"))
return CONF_DEFAULT_IGMP_QUERIER_TIMEOUT;
if (EQUAL(word, "altnet"))
return CONF_ALTNET;
if (EQUAL(word, "masklen"))
return CONF_MASKLEN;
if (EQUAL(word, "scoped"))
return CONF_SCOPED;
return CONF_UNKNOWN;
}
/* Check for optional /PREFIXLEN suffix to the address/group */
static void parse_prefix_len(char *token, uint32_t *len)
{
char *masklen = strchr(token, '/');
if (masklen) {
*masklen = 0;
masklen++;
if (!sscanf(masklen, "%u", len)) {
WARN("Invalid masklen '%s'", masklen);
*len = PIM_GROUP_PREFIX_DEFAULT_MASKLEN;
}
}
}
static void validate_prefix_len(uint32_t *len)
{
if (*len > (sizeof(uint32_t) * 8)) {
*len = (sizeof(uint32_t) * 8);
} else if (*len < PIM_GROUP_PREFIX_MIN_MASKLEN) {
WARN("Too small masklen %u. Defaulting to %d", *len, PIM_GROUP_PREFIX_MIN_MASKLEN);
*len = PIM_GROUP_PREFIX_MIN_MASKLEN;
}
}
/**
* parse_phyint - Parse physical interface configuration, if any.
* @s: String token
*
* Syntax:
* phyint <local-addr | ifname> [disable|enable]
* [threshold <t>] [preference <p>] [metric <m>]
* [altnet <net-addr>/<masklen>]
* [altnet <net-addr> masklen <masklen>]
* [scoped <net-addr>/<masklen>]
* [scoped <net-addr> masklen <masklen>]
*
* Returns:
* %TRUE if the parsing was successful, o.w. %FALSE
*/
static int parse_phyint(char *s)
{
char *w, c;
uint32_t local, altnet_addr, scoped_addr;
vifi_t vifi;
struct uvif *v;
u_int n, altnet_masklen = 0, scoped_masklen = 0;
struct phaddr *ph;
struct vif_acl *v_acl;
if (EQUAL((w = next_word(&s)), "")) {
WARN("Missing phyint address");
return FALSE;
}
local = ifname2addr(w);
if (!local) {
local = inet_parse(w, 4);
if (!inet_valid_host(local)) {
WARN("Invalid phyint address '%s'", w);
return FALSE;
}
}
for (vifi = 0, v = uvifs; vifi < numvifs; ++vifi, ++v) {
if (vifi == numvifs) {
WARN("phyint %s is not a valid interface", inet_fmt(local, s1, sizeof(s1)));
return FALSE;
}
if (local != v->uv_lcl_addr)
continue;
while (!EQUAL((w = next_word(&s)), "")) {
if (EQUAL(w, "disable")) {
v->uv_flags |= VIFF_DISABLED;
continue;
}
if (EQUAL(w, "enable")) {
v->uv_flags &= ~VIFF_DISABLED;
continue;
}
if (EQUAL(w, "altnet")) {
if (EQUAL((w = next_word(&s)), "")) {
WARN("Missing ALTNET for phyint %s", inet_fmt(local, s1, sizeof(s1)));
continue;
}
parse_prefix_len (w, &altnet_masklen);
altnet_addr = ifname2addr(w);
if (!altnet_addr) {
altnet_addr = inet_parse(w, 4);
if (!inet_valid_host(altnet_addr)) {
WARN("Invalid altnet address '%s'", w);
return FALSE;
}
}
if (EQUAL((w = next_word(&s)), "masklen")) {
if (EQUAL((w = next_word(&s)), "")) {
WARN("Missing ALTNET masklen for phyint %s", inet_fmt(local, s1, sizeof (s1)));
continue;
}
if (!sscanf(w, "%u", &altnet_masklen)) {
WARN("Invalid altnet masklen '%s' for phyint %s", w, inet_fmt(local, s1, sizeof(s1)));
continue;
}
}
ph = (struct phaddr *)calloc(1, sizeof(struct phaddr));
if (!ph)
return FALSE;
if (altnet_masklen) {
VAL_TO_MASK(ph->pa_subnetmask, altnet_masklen);
} else {
ph->pa_subnetmask = v->uv_subnetmask;
}
ph->pa_subnet = altnet_addr & ph->pa_subnetmask;
ph->pa_subnetbcast = ph->pa_subnet | ~ph->pa_subnetmask;
if (altnet_addr & ~ph->pa_subnetmask)
WARN("Extra subnet %s/%d has host bits set", inet_fmt(altnet_addr, s1, sizeof(s1)), altnet_masklen);
ph->pa_next = v->uv_addrs;
v->uv_addrs = ph;
logit(LOG_DEBUG, 0, "ALTNET: %s/%d", inet_fmt(altnet_addr, s1, sizeof(s1)), altnet_masklen);
} /* altnet */
/* scoped mcast groups/masklen */
if (EQUAL(w, "scoped")) {
if (EQUAL((w = next_word(&s)), "")) {
WARN("Missing SCOPED for phyint %s", inet_fmt(local, s1, sizeof(s1)));
continue;
}
parse_prefix_len (w, &scoped_masklen);
scoped_addr = ifname2addr(w);
if (!scoped_addr) {
scoped_addr = inet_parse(w, 4);
if (!IN_MULTICAST(ntohl(scoped_addr))) {
WARN("Invalid scoped address '%s'", w);
return FALSE;
}
}
if (EQUAL((w = next_word(&s)), "masklen")) {
if (EQUAL((w = next_word(&s)), "")) {
WARN("Missing SCOPED masklen for phyint %s", inet_fmt(local, s1, sizeof(s1)));
continue;
}
if (sscanf(w, "%u", &scoped_masklen) != 1) {
WARN("Invalid scoped masklen '%s' for phyint %s", w, inet_fmt(local, s1, sizeof(s1)));
continue;
}
}
/* Invalid config. VAL_TO_MASK() also requires len > 0 or shift op will fail. */
if (!scoped_masklen) {
WARN("Too small (0) scoped masklen for phyint %s", inet_fmt(local, s1, sizeof(s1)));
continue;
}
v_acl = (struct vif_acl *)calloc(1, sizeof(struct vif_acl));
if (!v_acl)
return FALSE;
VAL_TO_MASK(v_acl->acl_mask, scoped_masklen);
v_acl->acl_addr = scoped_addr & v_acl->acl_mask;
if (scoped_addr & ~v_acl->acl_mask)
WARN("Boundary spec %s/%d has host bits set", inet_fmt(scoped_addr, s1, sizeof(s1)), scoped_masklen);
v_acl->acl_next = v->uv_acl;
v->uv_acl = v_acl;
logit(LOG_DEBUG, 0, "SCOPED %s/%x", inet_fmt(v_acl->acl_addr, s1, sizeof(s1)), v_acl->acl_mask);
} /* scoped */
if (EQUAL(w, "threshold")) {
if (EQUAL((w = next_word(&s)), "")) {
WARN("Missing threshold for phyint %s", inet_fmt(local, s1, sizeof(s1)));
continue;
}
if (sscanf(w, "%u%c", &n, &c) != 1 || n < 1 || n > 255 ) {
WARN("Invalid threshold '%s' for phyint %s", w, inet_fmt(local, s1, sizeof(s1)));
continue;
}
v->uv_threshold = n;
continue;
} /* threshold */
if (EQUAL(w, "preference")) {
if (EQUAL((w = next_word(&s)), "")) {
WARN("Missing preference for phyint %s", inet_fmt(local, s1, sizeof(s1)));
continue;
}
if (sscanf(w, "%u%c", &n, &c) != 1 || n < 1 || n > 255 ) {
WARN("Invalid preference '%s' for phyint %s", w, inet_fmt(local, s1, sizeof(s1)));
continue;
}
IF_DEBUG(DEBUG_ASSERT) {
logit(LOG_DEBUG, 0, "Config setting default local preference on %s to %d", inet_fmt(local, s1, sizeof(s1)), n);
}
v->uv_local_pref = n;
continue;
}
if (EQUAL(w, "metric")) {
if (EQUAL((w = next_word(&s)), "")) {
WARN("Missing metric for phyint %s", inet_fmt(local, s1, sizeof(s1)));
continue;
}
if (sscanf(w, "%u%c", &n, &c) != 1 || n < 1 || n > 1024 ) {
WARN("Invalid metric '%s' for phyint %s", w, inet_fmt(local, s1, sizeof(s1)));
continue;
}
IF_DEBUG(DEBUG_ASSERT) {
logit(LOG_DEBUG, 0, "Setting default local metric on %s to %d", inet_fmt(local, s1, sizeof(s1)), n);
}
v->uv_local_metric = n;
continue;
}
} /* if not empty */
break;
}
return TRUE;
}
/**
* parse_candidateRP - Parse candidate Rendez-Vous Point information.
* @s: String token
*
* Syntax:
* cand_rp [address | ifname] [priority <0-255>] [time <10-16383>]
*
* Returns:
* %TRUE if the parsing was successful, o.w. %FALSE
*/
int parse_candidateRP(char *s)
{
u_int time = PIM_DEFAULT_CAND_RP_ADV_PERIOD;
u_int priority = PIM_DEFAULT_CAND_RP_PRIORITY;
char *w;
uint32_t local = INADDR_ANY_N;
cand_rp_flag = FALSE;
my_cand_rp_adv_period = PIM_DEFAULT_CAND_RP_ADV_PERIOD;
while (!EQUAL((w = next_word(&s)), "")) {
if (EQUAL(w, "priority")) {
if (EQUAL((w = next_word(&s)), "")) {
WARN("Missing priority, defaulting to %u", w, PIM_DEFAULT_CAND_RP_PRIORITY);
priority = PIM_DEFAULT_CAND_RP_PRIORITY;
continue;
}
if (sscanf(w, "%u", &priority) != 1) {
WARN("Invalid priority %s, defaulting to %u", w, PIM_DEFAULT_CAND_RP_PRIORITY);
priority = PIM_DEFAULT_CAND_RP_PRIORITY;
}
if (priority > PIM_MAX_CAND_RP_PRIORITY) {
WARN("Too high Cand-RP priority %u, defaulting to %d", priority, PIM_MAX_CAND_RP_PRIORITY);
priority = PIM_MAX_CAND_RP_PRIORITY;
}
continue;
}
if (EQUAL(w, "time")) {
if (EQUAL((w = next_word(&s)), "")) {
WARN("Missing Cand-RP announce interval, defaulting to %u", PIM_DEFAULT_CAND_RP_ADV_PERIOD);
time = PIM_DEFAULT_CAND_RP_ADV_PERIOD;
continue;
}
if (sscanf(w, "%u", &time) != 1) {
WARN("Invalid Cand-RP announce interval, defaulting to %u", PIM_DEFAULT_CAND_RP_ADV_PERIOD);
time = PIM_DEFAULT_CAND_RP_ADV_PERIOD;
continue;
}
if (time < PIM_MIN_CAND_RP_ADV_PERIOD)
time = PIM_MIN_CAND_RP_ADV_PERIOD;
if (time > PIM_MAX_CAND_RP_ADV_PERIOD)
time = PIM_MAX_CAND_RP_ADV_PERIOD;
my_cand_rp_adv_period = time;
continue;
}
/* Cand-RP interface or address */
local = ifname2addr(w);
if (!local)
local = inet_parse(w, 4);
if (!inet_valid_host(local)) {
local = max_local_address();
WARN("Invalid Cand-RP address '%s', defaulting to %s", w, inet_fmt(local, s1, sizeof(s1)));
} else if (local_address(local) == NO_VIF) {
local = max_local_address();
WARN("Cand-RP address '%s' is not local, defaulting to %s", w, inet_fmt(local, s1, sizeof(s1)));
}
}
if (local == INADDR_ANY_N) {
/* If address not provided, use the max. local */
local = max_local_address();
}
my_cand_rp_address = local;
my_cand_rp_priority = priority;
my_cand_rp_adv_period = time;
cand_rp_flag = TRUE;
logit(LOG_INFO, 0, "Local Cand-RP address %s, priority %u, interval %u sec",
inet_fmt(local, s1, sizeof(s1)), priority, time);
return TRUE;
}
/**
* parse_group_prefix - Parse group_prefix configured information.
* @s: String token
* Syntax:
* group_prefix <group-addr>[/<masklen>]
* <group-addr> [masklen <masklen>]
*
* Returns:
* %TRUE if the parsing was successful, o.w. %FALSE
*/
int parse_group_prefix(char *s)
{
char *w;
uint32_t group_addr;
uint32_t masklen = PIM_GROUP_PREFIX_DEFAULT_MASKLEN;
w = next_word(&s);
if (EQUAL(w, "")) {
WARN("Missing group_prefix address");
return FALSE;
}
parse_prefix_len (w, &masklen);
group_addr = inet_parse(w, 4);
if (!IN_MULTICAST(ntohl(group_addr))) {
WARN("Group address '%s' is not a valid multicast address", inet_fmt(group_addr, s1, sizeof(s1)));
return FALSE;
}
/* Was if (!(~(*cand_rp_adv_message.prefix_cnt_ptr))) which Arm GCC 4.4.2 dislikes:
* --> "config.c:693: warning: promoted ~unsigned is always non-zero"
* The prefix_cnt_ptr is a uint8_t so it seems this check was to prevent overruns.
* I've changed the check to see if we've already read 255 entries, if so the cnt
* is maximized and we need to tell the user. --Joachim Nilsson 2010-01-16 */
if (*cand_rp_adv_message.prefix_cnt_ptr == 255) {
WARN("Too many multicast groups configured!");
return FALSE;
}
if (EQUAL((w = next_word(&s)), "masklen")) {
w = next_word(&s);
if (!sscanf(w, "%u", &masklen))
masklen = PIM_GROUP_PREFIX_DEFAULT_MASKLEN;
}
validate_prefix_len(&masklen);
PUT_EGADDR(group_addr, (uint8_t)masklen, 0, cand_rp_adv_message.insert_data_ptr);
(*cand_rp_adv_message.prefix_cnt_ptr)++;
logit(LOG_INFO, 0, "Adding Cand-RP group prefix %s/%d", inet_fmt(group_addr, s1, sizeof(s1)), masklen);
return TRUE;
}
/**
* parseBSR - Parse the candidate BSR configured information.
* @s: String token
*
* Syntax:
* cand_bootstrap_router [address | ifname] [priority <0-255>]
*/
int parseBSR(char *s)
{
char *w;
uint32_t local = INADDR_ANY_N;
uint32_t priority = PIM_DEFAULT_BSR_PRIORITY;
cand_bsr_flag = FALSE;
while (!EQUAL((w = next_word(&s)), "")) {
if (EQUAL(w, "priority")) {
if (EQUAL((w = next_word(&s)), "")) {
WARN("Missing Cand-BSR priority, defaulting to %u", PIM_DEFAULT_BSR_PRIORITY);
priority = PIM_DEFAULT_BSR_PRIORITY;
continue;
}
if (sscanf(w, "%u", &priority) != 1) {
WARN("Invalid Cand-BSR priority %s, defaulting to %u", PIM_DEFAULT_BSR_PRIORITY);
priority = PIM_DEFAULT_BSR_PRIORITY;
continue;
}
if (priority > PIM_MAX_CAND_BSR_PRIORITY) {
WARN("Too high Cand-BSR priority %u, defaulting to %d", priority, PIM_MAX_CAND_BSR_PRIORITY);
priority = PIM_MAX_CAND_BSR_PRIORITY;
}
my_bsr_priority = (uint8_t)priority;
continue;
}
/* Cand-BSR interface or address */
local = ifname2addr(w);
if (!local)
local = inet_parse(w, 4);
if (!inet_valid_host(local)) {
local = max_local_address();
WARN("Invalid Cand-BSR address '%s', defaulting to %s", w, inet_fmt(local, s1, sizeof(s1)));
continue;
}
if (local_address(local) == NO_VIF) {
local = max_local_address();
WARN("Cand-BSR address '%s' is not local, defaulting to %s", w, inet_fmt(local, s1, sizeof(s1)));
}
}
if (local == INADDR_ANY_N) {
/* If address not provided, use the max. local */
local = max_local_address();
}
my_bsr_address = local;
my_bsr_priority = priority;
MASKLEN_TO_MASK(RP_DEFAULT_IPV4_HASHMASKLEN, my_bsr_hash_mask);
cand_bsr_flag = TRUE;
logit(LOG_INFO, 0, "Local Cand-BSR address %s, priority %u", inet_fmt(local, s1, sizeof(s1)), priority);
return TRUE;
}
/**
* parse_rp_address - Parse rp_address config option.
* @s: String token.
*
* This is an extension to the original pimd to add pimd.conf support for static
* Rendez-Vous Point addresses.
*
* The function has been extended by pjf@asn.pl, of Lintrack, to allow specifying
* multicast group addresses as well.
*
* Syntax:
* rp_address <ADDRESS> [<GROUP>[</LENGTH> masklen <LENGTH>]
*
* Returns:
* When parsing @s is successful this function returns %TRUE, otherwise %FALSE.
*/
int parse_rp_address(char *s)
{
char *w;
uint32_t local = 0xffffff;
uint32_t group_addr = htonl(INADDR_UNSPEC_GROUP);
uint32_t masklen = PIM_GROUP_PREFIX_DEFAULT_MASKLEN;
struct rp_hold *rph;
/* next is RP addr */
w = next_word(&s);
if (EQUAL(w, "")) {
logit(LOG_WARNING, 0, "Missing rp_address argument");
return FALSE;
}
local = inet_parse(w, 4);
if (local == 0xffffff) {
WARN("Invalid rp_address %s", w);
return FALSE;
}
/* next is group addr if exist */
w = next_word(&s);
if (!EQUAL(w, "")) {
parse_prefix_len (w, &masklen);
group_addr = inet_parse(w, 4);
if (!IN_MULTICAST(ntohl(group_addr))) {
WARN("%s is not a valid multicast address", inet_fmt(group_addr, s1, sizeof(s1)));
return FALSE;
}
/* next is prefix or priority if exist */
while (!EQUAL((w = next_word(&s)), "")) {
if (EQUAL(w, "masklen")) {
w = next_word(&s);
if (!sscanf(w, "%u", &masklen)) {
WARN("Invalid masklen %s. Defaulting to %d)", w, PIM_GROUP_PREFIX_DEFAULT_MASKLEN);
masklen = PIM_GROUP_PREFIX_DEFAULT_MASKLEN;
}
}
/* Unused, but keeping for backwards compatibility for people who
* may still have this option in their pimd.conf
* The priority of a static RP is hardcoded to always be 1, see Juniper's
* configuration or similar sources for reference. */
if (EQUAL(w, "priority")) {
w = next_word(&s);
WARN("The priority of static RP's is, as of pimd 2.2.0, always 1.");
}
}
} else {
group_addr = htonl(INADDR_UNSPEC_GROUP);
masklen = PIM_GROUP_PREFIX_MIN_MASKLEN;
}
validate_prefix_len(&masklen);
rph = calloc(1, sizeof(*rph));
if (!rph) {
logit(LOG_WARNING, 0, "Out of memory when parsing rp-address %s",
inet_fmt(local, s1, sizeof(s1)));
return FALSE;
}
rph->address = local;
rph->group = group_addr;
VAL_TO_MASK(rph->mask, masklen);
/* attach at the beginning */
rph->next = g_rp_hold;
g_rp_hold = rph;
logit(LOG_INFO, 0, "Local static RP: %s, group %s/%d",
inet_fmt(local, s1, sizeof(s1)), inet_fmt(group_addr, s2, sizeof(s2)), masklen);
return TRUE;
}
/**
* parse_compat_threshold - Parse old deprecated pimd.conf thresholds
* @line:
*
* This is a backwards compatible parser for the two older threshold
* settings used in pimd prior to v2.2.0. The switchover mechanism has
* been completely changed, however, so we simply read the settings as
* if they where the same as the new spt_threshold, only converting the
* rate argument differently (bps vs kbps). Last line to be read is
* what is activated in pimd as spt-threshold.
*
* Note, previously the parser was very lenient to errors, but since the
* default has changed it is much more strict. Any syntax error and pimd
* bails out ignoring the line.
*
* Syntax:
* switch_register_threshold [rate <BPS> interval <SEC>]
* switch_data_threshold [rate <BPS> interval <SEC>]
*
* Returns:
* When parsing @line is successful, returns %TRUE, otherwise %FALSE.
*/
static int parse_compat_threshold(char *line)
{
char *w;
int rate = -1;
int interval = -1;
while (!EQUAL((w = next_word(&line)), "")) {
if (EQUAL(w, "rate")) {
if (EQUAL((w = next_word(&line)), ""))
BAILOUT("Missing rate value in compat threshold parser");
/* 10 --> 1,000,000,000 == 100 Gbps */
if (sscanf(w, "%10d", &rate) != 1)
BAILOUT("Invalid rate value %s in compat threshold parser", w);
continue;
}
if (EQUAL(w, "interval")) {
if (EQUAL((w = next_word(&line)), ""))
IGNORING("Missing interval value in compat threshold parser");
/* 5 --> 99,999 ~= 27h */
if (sscanf(w, "%5d", &interval) != 1)
IGNORING("Invalid interval %s in compat threshold parser", w);
continue;
}
}
/* Set polling mode */
spt_threshold.mode = SPT_RATE;
/* Only accept values if they don't messup for new spt-threshold */
if (interval >= TIMER_INTERVAL)
spt_threshold.interval = interval;