From a12fcb3cee2d489b8648a2398812d7bed2f25faa Mon Sep 17 00:00:00 2001 From: Hans Dedecker Date: Sat, 15 May 2021 20:52:41 +0200 Subject: config: log config parse failures to syslog An invalid config setting for an interface lead to a flush of all config settings of the related interface and thus made the interface unusable. Change the behavior by logging config parse failures to syslog and not flushing all config settings Signed-off-by: Hans Dedecker --- README | 2 +- src/config.c | 130 ++++++++++++++++++++++++++++++++++++++--------------------- 2 files changed, 86 insertions(+), 46 deletions(-) diff --git a/README b/README index f9cbb11..bd63b0e 100644 --- a/README +++ b/README @@ -136,7 +136,7 @@ ra_retranstime integer 0 Retransmit Time in milliseconds to be advertised in RA messages ra_hoplimit integer 0 Current hoplimit to be advertised in RA messages -ra_mtu integer 0 MTU to be advertised in +ra_mtu integer - MTU to be advertised in RA messages ra_dns bool 1 Announce DNS configuration in RA messages (RFC8106) diff --git a/src/config.c b/src/config.c index 78b5855..e46ecb0 100644 --- a/src/config.c +++ b/src/config.c @@ -440,6 +440,8 @@ int config_parse_interface(void *data, size_t len, const char *name, bool overwr struct interface *iface; struct blob_attr *tb[IFACE_ATTR_MAX], *c; bool get_addrs = false; + int mode; + const char *ifname = NULL; blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, data, len); @@ -474,7 +476,6 @@ int config_parse_interface(void *data, size_t len, const char *name, bool overwr get_addrs = overwrite = true; } - const char *ifname = NULL; if (overwrite) { if ((c = tb[IFACE_ATTR_IFNAME])) ifname = blobmsg_get_string(c); @@ -522,18 +523,24 @@ int config_parse_interface(void *data, size_t len, const char *name, bool overwr if ((c = tb[IFACE_ATTR_LEASETIME])) { double time = parse_leasetime(c); - if (time < 0) - goto err; - iface->dhcp_leasetime = time; + if (time >= 0) + iface->dhcp_leasetime = time; + else + syslog(LOG_ERR, "Invalid %s value configured for interface '%s'", + iface_attrs[IFACE_ATTR_LEASETIME].name, iface->name); + } if ((c = tb[IFACE_ATTR_PREFERRED_LIFETIME])) { double time = parse_leasetime(c); - if (time < 0) - goto err; - iface->preferred_lifetime = time; + if (time >= 0) + iface->preferred_lifetime = time; + else + syslog(LOG_ERR, "Invalid %s value configured for interface '%s'", + iface_attrs[IFACE_ATTR_PREFERRED_LIFETIME].name, iface->name); + } if ((c = tb[IFACE_ATTR_START])) { @@ -570,7 +577,6 @@ int config_parse_interface(void *data, size_t len, const char *name, bool overwr } } - int mode; if ((c = tb[IFACE_ATTR_RA])) { if ((mode = parse_mode(blobmsg_get_string(c))) >= 0) { iface->ra = mode; @@ -578,7 +584,8 @@ int config_parse_interface(void *data, size_t len, const char *name, bool overwr if (iface->ra != MODE_DISABLED) iface->ignore = false; } else - goto err; + syslog(LOG_ERR, "Invalid %s mode configured for interface '%s'", + iface_attrs[IFACE_ATTR_RA].name, iface->name); } if ((c = tb[IFACE_ATTR_DHCPV4])) { @@ -589,9 +596,9 @@ int config_parse_interface(void *data, size_t len, const char *name, bool overwr if (iface->dhcpv4 != MODE_DISABLED) iface->ignore = false; } - } - else - goto err; + } else + syslog(LOG_ERR, "Invalid %s mode configured for interface %s", + iface_attrs[IFACE_ATTR_DHCPV4].name, iface->name); } if ((c = tb[IFACE_ATTR_DHCPV6])) { @@ -601,7 +608,8 @@ int config_parse_interface(void *data, size_t len, const char *name, bool overwr if (iface->dhcpv6 != MODE_DISABLED) iface->ignore = false; } else - goto err; + syslog(LOG_ERR, "Invalid %s mode configured for interface '%s'", + iface_attrs[IFACE_ATTR_DHCPV6].name, iface->name); } if ((c = tb[IFACE_ATTR_NDP])) { @@ -611,7 +619,8 @@ int config_parse_interface(void *data, size_t len, const char *name, bool overwr if (iface->ndp != MODE_DISABLED) iface->ignore = false; } else - goto err; + syslog(LOG_ERR, "Invalid %s mode configured for interface '%s'", + iface_attrs[IFACE_ATTR_NDP].name, iface->name); } if ((c = tb[IFACE_ATTR_ROUTER])) { @@ -619,10 +628,11 @@ int config_parse_interface(void *data, size_t len, const char *name, bool overwr unsigned rem; blobmsg_for_each_attr(cur, c, rem) { + struct in_addr addr4; + if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false)) continue; - struct in_addr addr4; if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) { iface->dhcpv4_router = realloc(iface->dhcpv4_router, (++iface->dhcpv4_router_cnt) * sizeof(*iface->dhcpv4_router)); @@ -631,7 +641,8 @@ int config_parse_interface(void *data, size_t len, const char *name, bool overwr iface->dhcpv4_router[iface->dhcpv4_router_cnt - 1] = addr4; } else - goto err; + syslog(LOG_ERR, "Invalid %s value configured for interface '%s'", + iface_attrs[IFACE_ATTR_ROUTER].name, iface->name); } } @@ -641,14 +652,19 @@ int config_parse_interface(void *data, size_t len, const char *name, bool overwr iface->always_rewrite_dns = true; blobmsg_for_each_attr(cur, c, rem) { + struct in_addr addr4; + struct in6_addr addr6; + if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false)) continue; - struct in_addr addr4; - struct in6_addr addr6; if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) { - if (addr4.s_addr == INADDR_ANY) - goto err; + if (addr4.s_addr == INADDR_ANY) { + syslog(LOG_ERR, "Invalid %s value configured for interface '%s'", + iface_attrs[IFACE_ATTR_DNS].name, iface->name); + + continue; + } iface->dhcpv4_dns = realloc(iface->dhcpv4_dns, (++iface->dhcpv4_dns_cnt) * sizeof(*iface->dhcpv4_dns)); @@ -657,8 +673,12 @@ int config_parse_interface(void *data, size_t len, const char *name, bool overwr iface->dhcpv4_dns[iface->dhcpv4_dns_cnt - 1] = addr4; } else if (inet_pton(AF_INET6, blobmsg_get_string(cur), &addr6) == 1) { - if (IN6_IS_ADDR_UNSPECIFIED(&addr6)) - goto err; + if (IN6_IS_ADDR_UNSPECIFIED(&addr6)) { + syslog(LOG_ERR, "Invalid %s value configured for interface '%s'", + iface_attrs[IFACE_ATTR_DNS].name, iface->name); + + continue; + } iface->dns = realloc(iface->dns, (++iface->dns_cnt) * sizeof(*iface->dns)); @@ -667,7 +687,8 @@ int config_parse_interface(void *data, size_t len, const char *name, bool overwr iface->dns[iface->dns_cnt - 1] = addr6; } else - goto err; + syslog(LOG_ERR, "Invalid %s value configured for interface '%s'", + iface_attrs[IFACE_ATTR_DNS].name, iface->name); } } @@ -679,18 +700,27 @@ int config_parse_interface(void *data, size_t len, const char *name, bool overwr unsigned rem; blobmsg_for_each_attr(cur, c, rem) { - if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false)) - continue; - uint8_t buf[256]; char *domain = blobmsg_get_string(cur); size_t domainlen = strlen(domain); + int len; + + if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false)) + continue; + + domain = blobmsg_get_string(cur); + domainlen = strlen(domain); + if (domainlen > 0 && domain[domainlen - 1] == '.') domain[domainlen - 1] = 0; - int len = dn_comp(domain, buf, sizeof(buf), NULL, NULL); - if (len <= 0) - goto err; + len = dn_comp(domain, buf, sizeof(buf), NULL, NULL); + if (len <= 0) { + syslog(LOG_ERR, "Invalid %s value configured for interface '%s'", + iface_attrs[IFACE_ATTR_DOMAIN].name, iface->name); + + continue; + } iface->search = realloc(iface->search, iface->search_len + len); if (!iface->search) @@ -748,41 +778,49 @@ int config_parse_interface(void *data, size_t len, const char *name, bool overwr } if ((c = tb[IFACE_ATTR_RA_FLAGS])) { - iface->ra_flags = 0; if (parse_ra_flags(&iface->ra_flags, c) < 0) - goto err; + syslog(LOG_ERR, "Invalid %s value configured for interface '%s'", + iface_attrs[IFACE_ATTR_RA_FLAGS].name, iface->name); } if ((c = tb[IFACE_ATTR_RA_REACHABLETIME])) { uint32_t ra_reachabletime = blobmsg_get_u32(c); - if (ra_reachabletime > 3600000) - goto err; - iface->ra_reachabletime = ra_reachabletime; + if (ra_reachabletime <= 3600000) + iface->ra_reachabletime = ra_reachabletime; + else + syslog(LOG_ERR, "Invalid %s value configured for interface '%s'", + iface_attrs[IFACE_ATTR_RA_REACHABLETIME].name, iface->name); } if ((c = tb[IFACE_ATTR_RA_RETRANSTIME])) { uint32_t ra_retranstime = blobmsg_get_u32(c); - if (ra_retranstime > 60000) - goto err; - iface->ra_retranstime = ra_retranstime; + if (ra_retranstime <= 60000) + iface->ra_retranstime = ra_retranstime; + else + syslog(LOG_ERR, "Invalid %s value configured for interface '%s'", + iface_attrs[IFACE_ATTR_RA_RETRANSTIME].name, iface->name); } if ((c = tb[IFACE_ATTR_RA_HOPLIMIT])) { uint32_t ra_hoplimit = blobmsg_get_u32(c); - if (ra_hoplimit > 255) - goto err; - iface->ra_hoplimit = ra_hoplimit; + if (ra_hoplimit <= 255) + iface->ra_hoplimit = ra_hoplimit; + else + syslog(LOG_ERR, "Invalid %s value configured for interface '%s'", + iface_attrs[IFACE_ATTR_RA_HOPLIMIT].name, iface->name); } if ((c = tb[IFACE_ATTR_RA_MTU])) { uint32_t ra_mtu = blobmsg_get_u32(c); - if (ra_mtu < 1280 || ra_mtu > 65535) - goto err; - iface->ra_mtu = ra_mtu; + if (ra_mtu >= 1280 || ra_mtu <= 65535) + iface->ra_mtu = ra_mtu; + else + syslog(LOG_ERR, "Invalid %s value configured for interface '%s'", + iface_attrs[IFACE_ATTR_RA_MTU].name, iface->name); } if ((c = tb[IFACE_ATTR_RA_SLAAC])) @@ -819,7 +857,8 @@ int config_parse_interface(void *data, size_t len, const char *name, bool overwr else if (!strcmp(prio, "medium") || !strcmp(prio, "default")) iface->route_preference = 0; else - goto err; + syslog(LOG_ERR, "Invalid %s mode configured for interface '%s'", + iface_attrs[IFACE_ATTR_RA_PREFERENCE].name, iface->name); } if ((c = tb[IFACE_ATTR_PD_MANAGER])) @@ -828,7 +867,8 @@ int config_parse_interface(void *data, size_t len, const char *name, bool overwr if ((c = tb[IFACE_ATTR_PD_CER]) && inet_pton(AF_INET6, blobmsg_get_string(c), &iface->dhcpv6_pd_cer) < 1) - goto err; + syslog(LOG_ERR, "Invalid %s value configured for interface '%s'", + iface_attrs[IFACE_ATTR_PD_CER].name, iface->name); if ((c = tb[IFACE_ATTR_NDPROXY_ROUTING])) iface->learn_routes = blobmsg_get_bool(c); -- cgit v1.2.3