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options.c
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options.c
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/*
* firewall3 - 3rd OpenWrt UCI firewall implementation
*
* Copyright (C) 2013-2014 Jo-Philipp Wich <[email protected]>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "options.h"
#include "ubus.h"
static bool
put_value(void *ptr, void *val, int elem_size, bool is_list)
{
void *copy;
if (is_list)
{
copy = malloc(elem_size);
if (!copy)
return false;
memcpy(copy, val, elem_size);
list_add_tail((struct list_head *)copy, (struct list_head *)ptr);
return true;
}
memcpy(ptr, val, elem_size);
return false;
}
static bool
parse_enum(void *ptr, const char *val, const char **values, int min, int max)
{
int i, l = strlen(val);
if (l > 0)
{
for (i = 0; i <= (max - min); i++)
{
if (!strncasecmp(val, values[i], l))
{
*((int *)ptr) = min + i;
return true;
}
}
}
return false;
}
const char *fw3_flag_names[__FW3_FLAG_MAX] = {
"filter",
"nat",
"mangle",
"raw",
"IPv4",
"IPv6",
"ACCEPT",
"REJECT",
"DROP",
"NOTRACK",
"HELPER",
"MARK",
"DSCP",
"DNAT",
"SNAT",
"MASQUERADE",
"ACCEPT",
"REJECT",
"DROP",
};
const char *fw3_reject_code_names[__FW3_REJECT_CODE_MAX] = {
"tcp-reset",
"port-unreach",
"adm-prohibited",
};
const char *fw3_limit_units[__FW3_LIMIT_UNIT_MAX] = {
"second",
"minute",
"hour",
"day",
};
const char *fw3_ipset_method_names[__FW3_IPSET_METHOD_MAX] = {
"(bug)",
"bitmap",
"hash",
"list",
};
const char *fw3_ipset_type_names[__FW3_IPSET_TYPE_MAX] = {
"(bug)",
"ip",
"port",
"mac",
"net",
"set",
};
static const char *weekdays[] = {
"monday",
"tuesday",
"wednesday",
"thursday",
"friday",
"saturday",
"sunday",
};
static const char *include_types[] = {
"script",
"restore",
};
static const char *reflection_sources[] = {
"internal",
"external",
};
static const struct { const char *name; uint8_t dscp; } dscp_classes[] = {
{ "CS0", 0x00 },
{ "CS1", 0x08 },
{ "CS2", 0x10 },
{ "CS3", 0x18 },
{ "CS4", 0x20 },
{ "CS5", 0x28 },
{ "CS6", 0x30 },
{ "CS7", 0x38 },
{ "BE", 0x00 },
{ "LE", 0x01 },
{ "AF11", 0x0a },
{ "AF12", 0x0c },
{ "AF13", 0x0e },
{ "AF21", 0x12 },
{ "AF22", 0x14 },
{ "AF23", 0x16 },
{ "AF31", 0x1a },
{ "AF32", 0x1c },
{ "AF33", 0x1e },
{ "AF41", 0x22 },
{ "AF42", 0x24 },
{ "AF43", 0x26 },
{ "EF", 0x2e }
};
bool
fw3_parse_bool(void *ptr, const char *val, bool is_list)
{
if (!strcmp(val, "true") || !strcmp(val, "yes") || !strcmp(val, "1"))
*((bool *)ptr) = true;
else
*((bool *)ptr) = false;
return true;
}
bool
fw3_parse_int(void *ptr, const char *val, bool is_list)
{
char *e;
int n = strtol(val, &e, 0);
if (e == val || *e)
return false;
*((int *)ptr) = n;
return true;
}
bool
fw3_parse_string(void *ptr, const char *val, bool is_list)
{
*((char **)ptr) = (char *)val;
return true;
}
bool
fw3_parse_target(void *ptr, const char *val, bool is_list)
{
return parse_enum(ptr, val, &fw3_flag_names[FW3_FLAG_ACCEPT],
FW3_FLAG_ACCEPT, FW3_FLAG_MASQUERADE);
}
bool
fw3_parse_reject_code(void *ptr, const char *val, bool is_list)
{
return parse_enum(ptr, val, &fw3_reject_code_names[FW3_REJECT_CODE_TCP_RESET],
FW3_REJECT_CODE_TCP_RESET, FW3_REJECT_CODE_ADM_PROHIBITED);
}
bool
fw3_parse_limit(void *ptr, const char *val, bool is_list)
{
struct fw3_limit *limit = ptr;
enum fw3_limit_unit u = FW3_LIMIT_UNIT_SECOND;
char *e;
int n;
if (*val == '!')
{
limit->invert = true;
while (isspace(*++val));
}
n = strtol(val, &e, 10);
if (errno == ERANGE || errno == EINVAL)
return false;
if (*e && *e++ != '/')
return false;
if (!strlen(e))
return false;
if (!parse_enum(&u, e, fw3_limit_units, 0, FW3_LIMIT_UNIT_DAY))
return false;
limit->rate = n;
limit->unit = u;
return true;
}
bool
fw3_parse_device(void *ptr, const char *val, bool is_list)
{
char *p;
struct fw3_device dev = { };
if (*val == '*')
{
dev.set = true;
dev.any = true;
put_value(ptr, &dev, sizeof(dev), is_list);
return true;
}
if (*val == '!')
{
dev.invert = true;
while (isspace(*++val));
}
if ((p = strchr(val, '@')) != NULL)
{
*p++ = 0;
snprintf(dev.network, sizeof(dev.network), "%s", p);
}
if (*val)
snprintf(dev.name, sizeof(dev.name), "%s", val);
else
return false;
dev.set = true;
put_value(ptr, &dev, sizeof(dev), is_list);
return true;
}
bool
fw3_parse_address(void *ptr, const char *val, bool is_list)
{
struct fw3_address addr = { };
struct in_addr v4;
struct in6_addr v6;
char *p = NULL, *m = NULL, *s, *e;
int bits = -1;
if (*val == '!')
{
addr.invert = true;
while (isspace(*++val));
}
s = strdup(val);
if (!s)
return false;
if ((m = strchr(s, '/')) != NULL)
*m++ = 0;
else if ((p = strchr(s, '-')) != NULL)
*p++ = 0;
if (inet_pton(AF_INET6, s, &v6))
{
addr.family = FW3_FAMILY_V6;
addr.address.v6 = v6;
if (m)
{
if (!inet_pton(AF_INET6, m, &v6))
{
bits = strtol(m, &e, 10);
if ((*e != 0) || !fw3_bitlen2netmask(addr.family, bits, &v6))
goto fail;
}
addr.mask.v6 = v6;
}
else if (p)
{
if (!inet_pton(AF_INET6, p, &addr.mask.v6))
goto fail;
addr.range = true;
}
else
{
memset(addr.mask.v6.s6_addr, 0xFF, 16);
}
}
else if (inet_pton(AF_INET, s, &v4))
{
addr.family = FW3_FAMILY_V4;
addr.address.v4 = v4;
if (m)
{
if (!inet_pton(AF_INET, m, &v4))
{
bits = strtol(m, &e, 10);
if ((*e != 0) || !fw3_bitlen2netmask(addr.family, bits, &v4))
goto fail;
}
addr.mask.v4 = v4;
}
else if (p)
{
if (!inet_pton(AF_INET, p, &addr.mask.v4))
goto fail;
addr.range = true;
}
else
{
addr.mask.v4.s_addr = 0xFFFFFFFF;
}
}
else
{
goto fail;
}
free(s);
addr.set = true;
put_value(ptr, &addr, sizeof(addr), is_list);
return true;
fail:
free(s);
return false;
}
bool
fw3_parse_network(void *ptr, const char *val, bool is_list)
{
struct fw3_device dev = { };
struct fw3_address *addr, *tmp;
LIST_HEAD(addr_list);
int n_addrs;
if (!fw3_parse_address(ptr, val, is_list))
{
if (!fw3_parse_device(&dev, val, false))
return false;
n_addrs = fw3_ubus_address(&addr_list, dev.name);
list_for_each_entry(addr, &addr_list, list)
{
addr->invert = dev.invert;
addr->resolved = true;
}
/* add an empty address member with .set = false, .resolved = true
* to signal resolving failure to callers */
if (n_addrs == 0)
{
tmp = fw3_alloc(sizeof(*tmp));
tmp->resolved = true;
list_add_tail(&tmp->list, &addr_list);
}
if (is_list)
{
list_splice_tail(&addr_list, ptr);
}
else if (!list_empty(&addr_list))
{
memcpy(ptr, list_first_entry(&addr_list, typeof(*addr), list),
sizeof(*addr));
list_for_each_entry_safe(addr, tmp, &addr_list, list)
free(addr);
}
}
return true;
}
bool
fw3_parse_mac(void *ptr, const char *val, bool is_list)
{
struct fw3_mac addr = { };
struct ether_addr *mac;
if (*val == '!')
{
addr.invert = true;
while (isspace(*++val));
}
if ((mac = ether_aton(val)) != NULL)
{
addr.mac = *mac;
addr.set = true;
put_value(ptr, &addr, sizeof(addr), is_list);
return true;
}
return false;
}
bool
fw3_parse_port(void *ptr, const char *val, bool is_list)
{
struct fw3_port range = { };
uint16_t n;
uint16_t m;
char *p;
if (*val == '!')
{
range.invert = true;
while (isspace(*++val));
}
n = strtoul(val, &p, 10);
if (errno == ERANGE || errno == EINVAL)
return false;
if (*p && *p != '-' && *p != ':')
return false;
if (*p)
{
m = strtoul(++p, NULL, 10);
if (errno == ERANGE || errno == EINVAL || m < n)
return false;
range.port_min = n;
range.port_max = m;
}
else
{
range.port_min = n;
range.port_max = n;
}
range.set = true;
put_value(ptr, &range, sizeof(range), is_list);
return true;
}
bool
fw3_parse_family(void *ptr, const char *val, bool is_list)
{
if (!strcmp(val, "any") || !strcmp(val, "*"))
*((enum fw3_family *)ptr) = FW3_FAMILY_ANY;
else if (!strcmp(val, "inet") || strrchr(val, '4'))
*((enum fw3_family *)ptr) = FW3_FAMILY_V4;
else if (!strcmp(val, "inet6") || strrchr(val, '6'))
*((enum fw3_family *)ptr) = FW3_FAMILY_V6;
else
return false;
return true;
}
bool
fw3_parse_icmptype(void *ptr, const char *val, bool is_list)
{
struct fw3_icmptype icmp = { };
bool v4 = false;
bool v6 = false;
char *p;
int i;
for (i = 0; i < ARRAY_SIZE(fw3_icmptype_list_v4); i++)
{
if (!strcmp(val, fw3_icmptype_list_v4[i].name))
{
icmp.type = fw3_icmptype_list_v4[i].type;
icmp.code_min = fw3_icmptype_list_v4[i].code_min;
icmp.code_max = fw3_icmptype_list_v4[i].code_max;
v4 = true;
break;
}
}
for (i = 0; i < ARRAY_SIZE(fw3_icmptype_list_v6); i++)
{
if (!strcmp(val, fw3_icmptype_list_v6[i].name))
{
icmp.type6 = fw3_icmptype_list_v6[i].type;
icmp.code6_min = fw3_icmptype_list_v6[i].code_min;
icmp.code6_max = fw3_icmptype_list_v6[i].code_max;
v6 = true;
break;
}
}
if (!v4 && !v6)
{
i = strtoul(val, &p, 10);
if ((p == val) || (*p != '/' && *p != 0) || (i > 0xFF))
return false;
icmp.type = i;
if (*p == '/')
{
val = ++p;
i = strtoul(val, &p, 10);
if ((p == val) || (*p != 0) || (i > 0xFF))
return false;
icmp.code_min = i;
icmp.code_max = i;
}
else
{
icmp.code_min = 0;
icmp.code_max = 0xFF;
}
icmp.type6 = icmp.type;
icmp.code6_min = icmp.code_min;
icmp.code6_max = icmp.code_max;
v4 = true;
v6 = true;
}
icmp.family = (v4 && v6) ? FW3_FAMILY_ANY
: (v6 ? FW3_FAMILY_V6 : FW3_FAMILY_V4);
put_value(ptr, &icmp, sizeof(icmp), is_list);
return true;
}
bool
fw3_parse_protocol(void *ptr, const char *val, bool is_list)
{
struct fw3_protocol proto = { };
struct protoent *ent;
char *e;
if (*val == '!')
{
proto.invert = true;
while (isspace(*++val));
}
if (!strcmp(val, "all") || !strcmp(val, "any") || !strcmp(val, "*"))
{
proto.any = true;
put_value(ptr, &proto, sizeof(proto), is_list);
return true;
}
else if (!strcmp(val, "icmpv6"))
{
val = "ipv6-icmp";
}
else if (!strcmp(val, "tcpudp"))
{
proto.protocol = 6;
if (put_value(ptr, &proto, sizeof(proto), is_list))
{
proto.protocol = 17;
put_value(ptr, &proto, sizeof(proto), is_list);
}
return true;
}
ent = getprotobyname(val);
if (ent)
{
proto.protocol = ent->p_proto;
put_value(ptr, &proto, sizeof(proto), is_list);
return true;
}
proto.protocol = strtoul(val, &e, 10);
if ((e == val) || (*e != 0))
return false;
put_value(ptr, &proto, sizeof(proto), is_list);
return true;
}
bool
fw3_parse_ipset_method(void *ptr, const char *val, bool is_list)
{
return parse_enum(ptr, val, &fw3_ipset_method_names[FW3_IPSET_METHOD_BITMAP],
FW3_IPSET_METHOD_BITMAP, FW3_IPSET_METHOD_LIST);
}
bool
fw3_parse_ipset_datatype(void *ptr, const char *val, bool is_list)
{
struct fw3_ipset_datatype type = { };
type.dir = "src";
if (!strncmp(val, "dest_", 5))
{
val += 5;
type.dir = "dst";
}
else if (!strncmp(val, "dst_", 4))
{
val += 4;
type.dir = "dst";
}
else if (!strncmp(val, "src_", 4))
{
val += 4;
type.dir = "src";
}
if (parse_enum(&type.type, val, &fw3_ipset_type_names[FW3_IPSET_TYPE_IP],
FW3_IPSET_TYPE_IP, FW3_IPSET_TYPE_SET))
{
put_value(ptr, &type, sizeof(type), is_list);
return true;
}
return false;
}
bool
fw3_parse_date(void *ptr, const char *val, bool is_list)
{
unsigned int year = 1970, mon = 1, day = 1, hour = 0, min = 0, sec = 0;
struct tm tm = { 0 };
time_t ts;
char *p;
year = strtoul(val, &p, 10);
if ((*p != '-' && *p) || year < 1970 || year > 2038)
goto fail;
else if (!*p)
goto ret;
mon = strtoul(++p, &p, 10);
if ((*p != '-' && *p) || mon > 12)
goto fail;
else if (!*p)
goto ret;
day = strtoul(++p, &p, 10);
if ((*p != 'T' && *p) || day > 31)
goto fail;
else if (!*p)
goto ret;
hour = strtoul(++p, &p, 10);
if ((*p != ':' && *p) || hour > 23)
goto fail;
else if (!*p)
goto ret;
min = strtoul(++p, &p, 10);
if ((*p != ':' && *p) || min > 59)
goto fail;
else if (!*p)
goto ret;
sec = strtoul(++p, &p, 10);
if (*p || sec > 59)
goto fail;
ret:
tm.tm_year = year - 1900;
tm.tm_mon = mon - 1;
tm.tm_mday = day;
tm.tm_hour = hour;
tm.tm_min = min;
tm.tm_sec = sec;
ts = mktime(&tm) - timezone;
if (ts >= 0)
{
gmtime_r(&ts, (struct tm *)ptr);
return true;
}
fail:
return false;
}
bool
fw3_parse_time(void *ptr, const char *val, bool is_list)
{
unsigned int hour = 0, min = 0, sec = 0;
char *p;
hour = strtoul(val, &p, 10);
if (*p != ':' || hour > 23)
goto fail;
min = strtoul(++p, &p, 10);
if ((*p != ':' && *p) || min > 59)
goto fail;
else if (!*p)
goto ret;
sec = strtoul(++p, &p, 10);
if (*p || sec > 59)
goto fail;
ret:
*((int *)ptr) = 60 * 60 * hour + 60 * min + sec;
return true;
fail:
return false;
}
bool
fw3_parse_weekdays(void *ptr, const char *val, bool is_list)
{
unsigned int w = 0;
char *p, *s;
if (*val == '!')
{
fw3_setbit(*(uint8_t *)ptr, 0);
while (isspace(*++val));
}
if (!(s = strdup(val)))
return false;
for (p = strtok(s, " \t"); p; p = strtok(NULL, " \t"))
{
if (!parse_enum(&w, p, weekdays, 1, 7))
{
w = strtoul(p, &p, 10);
if (*p || w < 1 || w > 7)
{
free(s);
return false;
}
}
fw3_setbit(*(uint8_t *)ptr, w);
}
free(s);
return true;
}
bool
fw3_parse_monthdays(void *ptr, const char *val, bool is_list)
{
unsigned int d;
char *p, *s;
if (*val == '!')
{
fw3_setbit(*(uint32_t *)ptr, 0);
while (isspace(*++val));
}
if (!(s = strdup(val)))
return false;
for (p = strtok(s, " \t"); p; p = strtok(NULL, " \t"))
{
d = strtoul(p, &p, 10);
if (*p || d < 1 || d > 31)
{
free(s);
return false;
}
fw3_setbit(*(uint32_t *)ptr, d);
}
free(s);
return true;
}
bool
fw3_parse_include_type(void *ptr, const char *val, bool is_list)
{
return parse_enum(ptr, val, include_types,
FW3_INC_TYPE_SCRIPT, FW3_INC_TYPE_RESTORE);
}
bool
fw3_parse_reflection_source(void *ptr, const char *val, bool is_list)
{
return parse_enum(ptr, val, reflection_sources,
FW3_REFLECTION_INTERNAL, FW3_REFLECTION_EXTERNAL);
}
bool
fw3_parse_mark(void *ptr, const char *val, bool is_list)
{
uint32_t n;
char *s, *e;
struct fw3_mark *m = ptr;
if (*val == '!')
{
m->invert = true;
while (isspace(*++val));
}
if ((s = strchr(val, '/')) != NULL)
*s++ = 0;
n = strtoul(val, &e, 0);
if (e == val || *e)
return false;
m->mark = n;
m->mask = 0xFFFFFFFF;
if (s)
{
n = strtoul(s, &e, 0);
if (e == s || *e)
return false;
m->mask = n;
}
m->set = true;
return true;
}
bool
fw3_parse_dscp(void *ptr, const char *val, bool is_list)
{
uint32_t n;
char *e;
struct fw3_dscp *d = ptr;
if (*val == '!')
{
d->invert = true;
while (isspace(*++val));
}
for (n = 0; n < sizeof(dscp_classes) / sizeof(dscp_classes[0]); n++)
{
if (strcmp(dscp_classes[n].name, val))
continue;
d->set = true;
d->dscp = dscp_classes[n].dscp;
return true;
}
n = strtoul(val, &e, 0);
if (e == val || *e || n > 0x3F)
return false;
d->set = true;
d->dscp = n;
return true;
}
bool
fw3_parse_setmatch(void *ptr, const char *val, bool is_list)
{
struct fw3_setmatch *m = ptr;
char *p, *s;
int i;
if (*val == '!')
{
m->invert = true;
while (isspace(*++val));
}
if (!(s = strdup(val)))
return false;
if (!(p = strtok(s, " \t")))
{
free(s);
return false;
}
snprintf(m->name, sizeof(m->name), "%s", p);
for (i = 0, p = strtok(NULL, " \t,");
i < 3 && p != NULL;
i++, p = strtok(NULL, " \t,"))
{
if (!strncmp(p, "dest", 4) || !strncmp(p, "dst", 3))
m->dir[i] = "dst";
else if (!strncmp(p, "src", 3))
m->dir[i] = "src";
}
free(s);
m->set = true;
return true;
}
bool
fw3_parse_direction(void *ptr, const char *val, bool is_list)
{
bool *is_out = ptr;
bool valid = true;
if (!strcmp(val, "in") || !strcmp(val, "ingress"))
*is_out = false;
else if (!strcmp(val, "out") || !strcmp(val, "egress"))
*is_out = true;
else
valid = false;
return valid;
}
bool
fw3_parse_cthelper(void *ptr, const char *val, bool is_list)
{
struct fw3_cthelpermatch m = { };
if (*val == '!')
{
m.invert = true;
while (isspace(*++val));
}
if (*val)
{
m.set = true;
snprintf(m.name, sizeof(m.name), "%s", val);
put_value(ptr, &m, sizeof(m), is_list);
return true;
}
return false;
}
bool
fw3_parse_setentry(void *ptr, const char *val, bool is_list)