[thirdparty/systemd.git] / src / shared / net-condition.c

/* SPDX-License-Identifier: LGPL-2.1-or-later */

#include <fnmatch.h>

#include "sd-device.h"

#include "alloc-util.h"
#include "condition.h"
#include "env-util.h"
#include "extract-word.h"
#include "log.h"
#include "net-condition.h"
#include "netif-util.h"
#include "set.h"
#include "socket-util.h"
#include "string-util.h"
#include "strv.h"
#include "wifi-util.h"

void net_match_clear(NetMatch *match) {
        if (!match)
                return;

        match->hw_addr = set_free(match->hw_addr);
        match->permanent_hw_addr = set_free(match->permanent_hw_addr);
        match->path = strv_free(match->path);
        match->driver = strv_free(match->driver);
        match->iftype = strv_free(match->iftype);
        match->kind = strv_free(match->kind);
        match->ifname = strv_free(match->ifname);
        match->property = strv_free(match->property);
        match->wlan_iftype = strv_free(match->wlan_iftype);
        match->ssid = strv_free(match->ssid);
        match->bssid = set_free(match->bssid);
}

bool net_match_is_empty(const NetMatch *match) {
        assert(match);

        return
                set_isempty(match->hw_addr) &&
                set_isempty(match->permanent_hw_addr) &&
                strv_isempty(match->path) &&
                strv_isempty(match->driver) &&
                strv_isempty(match->iftype) &&
                strv_isempty(match->kind) &&
                strv_isempty(match->ifname) &&
                strv_isempty(match->property) &&
                strv_isempty(match->wlan_iftype) &&
                strv_isempty(match->ssid) &&
                set_isempty(match->bssid);
}

static bool net_condition_test_strv(char * const *patterns, const char *string) {
        bool match = false, has_positive_rule = false;

        if (strv_isempty(patterns))
                return true;

        STRV_FOREACH(p, patterns) {
                const char *q = *p;
                bool invert;

                invert = *q == '!';
                q += invert;

                if (!invert)
                        has_positive_rule = true;

                if (string && fnmatch(q, string, 0) == 0) {
                        if (invert)
                                return false;
                        else
                                match = true;
                }
        }

        return has_positive_rule ? match : true;
}

static bool net_condition_test_ifname(char * const *patterns, const char *ifname, char * const *alternative_names) {
        if (net_condition_test_strv(patterns, ifname))
                return true;

        STRV_FOREACH(p, alternative_names)
                if (net_condition_test_strv(patterns, *p))
                        return true;

        return false;
}

static int net_condition_test_property(char * const *match_property, sd_device *device) {
        if (strv_isempty(match_property))
                return true;

        STRV_FOREACH(p, match_property) {
                _cleanup_free_ char *key = NULL;
                const char *val, *dev_val;
                bool invert, v;

                invert = **p == '!';

                val = strchr(*p + invert, '=');
                if (!val)
                        return -EINVAL;

                key = strndup(*p + invert, val - *p - invert);
                if (!key)
                        return -ENOMEM;

                val++;

                v = device &&
                        sd_device_get_property_value(device, key, &dev_val) >= 0 &&
                        fnmatch(val, dev_val, 0) == 0;

                if (invert ? v : !v)
                        return false;
        }

        return true;
}

int net_match_config(
                const NetMatch *match,
                sd_device *device,
                const struct hw_addr_data *hw_addr,
                const struct hw_addr_data *permanent_hw_addr,
                const char *driver,
                unsigned short iftype,
                const char *kind,
                const char *ifname,
                char * const *alternative_names,
                enum nl80211_iftype wlan_iftype,
                const char *ssid,
                const struct ether_addr *bssid) {

        _cleanup_free_ char *iftype_str = NULL;
        const char *path = NULL;

        assert(match);

        if (net_get_type_string(device, iftype, &iftype_str) == -ENOMEM)
                return -ENOMEM;

        if (device)
                (void) sd_device_get_property_value(device, "ID_PATH", &path);

        if (match->hw_addr && (!hw_addr || !set_contains(match->hw_addr, hw_addr)))
                return false;

        if (match->permanent_hw_addr &&
            (!permanent_hw_addr ||
             !set_contains(match->permanent_hw_addr, permanent_hw_addr)))
                return false;

        if (!net_condition_test_strv(match->path, path))
                return false;

        if (!net_condition_test_strv(match->driver, driver))
                return false;

        if (!net_condition_test_strv(match->iftype, iftype_str))
                return false;

        if (!net_condition_test_strv(match->kind, kind))
                return false;

        if (!net_condition_test_ifname(match->ifname, ifname, alternative_names))
                return false;

        if (!net_condition_test_property(match->property, device))
                return false;

        if (!net_condition_test_strv(match->wlan_iftype, nl80211_iftype_to_string(wlan_iftype)))
                return false;

        if (!net_condition_test_strv(match->ssid, ssid))
                return false;

        if (match->bssid && (!bssid || !set_contains(match->bssid, bssid)))
                return false;

        return true;
}

int config_parse_net_condition(
                const char *unit,
                const char *filename,
                unsigned line,
                const char *section,
                unsigned section_line,
                const char *lvalue,
                int ltype,
                const char *rvalue,
                void *data,
                void *userdata) {

        ConditionType cond = ltype;
        Condition **list = data, *c;
        bool negate;

        assert(filename);
        assert(lvalue);
        assert(rvalue);
        assert(data);

        if (isempty(rvalue)) {
                *list = condition_free_list_type(*list, cond);
                return 0;
        }

        negate = rvalue[0] == '!';
        if (negate)
                rvalue++;

        c = condition_new(cond, rvalue, false, negate);
        if (!c)
                return log_oom();

        /* Drop previous assignment. */
        *list = condition_free_list_type(*list, cond);

        LIST_PREPEND(conditions, *list, c);
        return 0;
}

int config_parse_match_strv(
                const char *unit,
                const char *filename,
                unsigned line,
                const char *section,
                unsigned section_line,
                const char *lvalue,
                int ltype,
                const char *rvalue,
                void *data,
                void *userdata) {

        const char *p = ASSERT_PTR(rvalue);
        char ***sv = ASSERT_PTR(data);
        bool invert;
        int r;

        assert(filename);
        assert(lvalue);

        if (isempty(rvalue)) {
                *sv = strv_free(*sv);
                return 0;
        }

        invert = *p == '!';
        p += invert;

        for (;;) {
                _cleanup_free_ char *word = NULL, *k = NULL;

                r = extract_first_word(&p, &word, NULL, EXTRACT_UNQUOTE|EXTRACT_RETAIN_ESCAPE);
                if (r == 0)
                        return 0;
                if (r == -ENOMEM)
                        return log_oom();
                if (r < 0) {
                        log_syntax(unit, LOG_WARNING, filename, line, r,
                                   "Invalid syntax, ignoring: %s", rvalue);
                        return 0;
                }

                if (invert) {
                        k = strjoin("!", word);
                        if (!k)
                                return log_oom();
                } else
                        k = TAKE_PTR(word);

                r = strv_consume(sv, TAKE_PTR(k));
                if (r < 0)
                        return log_oom();
        }
}

int config_parse_match_ifnames(
                const char *unit,
                const char *filename,
                unsigned line,
                const char *section,
                unsigned section_line,
                const char *lvalue,
                int ltype,
                const char *rvalue,
                void *data,
                void *userdata) {

        const char *p = ASSERT_PTR(rvalue);
        char ***sv = ASSERT_PTR(data);
        bool invert;
        int r;

        assert(filename);
        assert(lvalue);

        if (isempty(rvalue)) {
                *sv = strv_free(*sv);
                return 0;
        }

        invert = *p == '!';
        p += invert;

        for (;;) {
                _cleanup_free_ char *word = NULL, *k = NULL;

                r = extract_first_word(&p, &word, NULL, 0);
                if (r == 0)
                        return 0;
                if (r == -ENOMEM)
                        return log_oom();
                if (r < 0) {
                        log_syntax(unit, LOG_WARNING, filename, line, 0,
                                   "Failed to parse interface name list, ignoring: %s", rvalue);
                        return 0;
                }

                if (!ifname_valid_full(word, ltype)) {
                        log_syntax(unit, LOG_WARNING, filename, line, 0,
                                   "Interface name is not valid or too long, ignoring assignment: %s", word);
                        continue;
                }

                if (invert) {
                        k = strjoin("!", word);
                        if (!k)
                                return log_oom();
                } else
                        k = TAKE_PTR(word);

                r = strv_consume(sv, TAKE_PTR(k));
                if (r < 0)
                        return log_oom();
        }
}

int config_parse_match_property(
                const char *unit,
                const char *filename,
                unsigned line,
                const char *section,
                unsigned section_line,
                const char *lvalue,
                int ltype,
                const char *rvalue,
                void *data,
                void *userdata) {

        const char *p = ASSERT_PTR(rvalue);
        char ***sv = ASSERT_PTR(data);
        bool invert;
        int r;

        assert(filename);
        assert(lvalue);

        if (isempty(rvalue)) {
                *sv = strv_free(*sv);
                return 0;
        }

        invert = *p == '!';
        p += invert;

        for (;;) {
                _cleanup_free_ char *word = NULL, *k = NULL;

                r = extract_first_word(&p, &word, NULL, EXTRACT_CUNESCAPE|EXTRACT_UNQUOTE);
                if (r == 0)
                        return 0;
                if (r == -ENOMEM)
                        return log_oom();
                if (r < 0) {
                        log_syntax(unit, LOG_WARNING, filename, line, 0,
                                   "Invalid syntax, ignoring: %s", rvalue);
                        return 0;
                }

                if (!env_assignment_is_valid(word)) {
                        log_syntax(unit, LOG_WARNING, filename, line, 0,
                                   "Invalid property or value, ignoring assignment: %s", word);
                        continue;
                }

                if (invert) {
                        k = strjoin("!", word);
                        if (!k)
                                return log_oom();
                } else
                        k = TAKE_PTR(word);

                r = strv_consume(sv, TAKE_PTR(k));
                if (r < 0)
                        return log_oom();
        }
}
Commit	Line	Data
cca2da15	1	/* SPDX-License-Identifier: LGPL-2.1-or-later */
7e19cc54	2
6553db60	3	#include <fnmatch.h>
69a283c5 DDM	4
69a283c5 DDM	5	#include "sd-device.h"
7e19cc54	6
b78d73fa	7	#include "alloc-util.h"
7e19cc54 YW	8	#include "condition.h"
7e19cc54 YW	9	#include "env-util.h"
69a283c5	10	#include "extract-word.h"
7e19cc54 YW	11	#include "log.h"
7e19cc54 YW	12	#include "net-condition.h"
b5cc5591	13	#include "netif-util.h"
69a283c5	14	#include "set.h"
7e19cc54	15	#include "socket-util.h"
69a283c5	16	#include "string-util.h"
7e19cc54	17	#include "strv.h"
abad436d	18	#include "wifi-util.h"
7e19cc54	19
5722fb89 YW	20	void net_match_clear(NetMatch *match) {
	21	if (!match)
	22	return;
	23
52135071 YW	24	match->hw_addr = set_free(match->hw_addr);
52135071 YW	25	match->permanent_hw_addr = set_free(match->permanent_hw_addr);
5722fb89 YW	26	match->path = strv_free(match->path);
	27	match->driver = strv_free(match->driver);
	28	match->iftype = strv_free(match->iftype);
65022cd7	29	match->kind = strv_free(match->kind);
5722fb89 YW	30	match->ifname = strv_free(match->ifname);
5722fb89 YW	31	match->property = strv_free(match->property);
77f75f4f	32	match->wlan_iftype = strv_free(match->wlan_iftype);
5722fb89	33	match->ssid = strv_free(match->ssid);
c6df73ca	34	match->bssid = set_free(match->bssid);
5722fb89 YW	35	}
	36
	37	bool net_match_is_empty(const NetMatch *match) {
	38	assert(match);
	39
	40	return
52135071 YW	41	set_isempty(match->hw_addr) &&
52135071 YW	42	set_isempty(match->permanent_hw_addr) &&
5722fb89 YW	43	strv_isempty(match->path) &&
	44	strv_isempty(match->driver) &&
	45	strv_isempty(match->iftype) &&
65022cd7	46	strv_isempty(match->kind) &&
5722fb89 YW	47	strv_isempty(match->ifname) &&
5722fb89 YW	48	strv_isempty(match->property) &&
77f75f4f	49	strv_isempty(match->wlan_iftype) &&
5722fb89 YW	50	strv_isempty(match->ssid) &&
	51	set_isempty(match->bssid);
	52	}
	53
7e19cc54	54	static bool net_condition_test_strv(char * const patterns, const char string) {
7e19cc54 YW	55	bool match = false, has_positive_rule = false;
	56
	57	if (strv_isempty(patterns))
	58	return true;
	59
	60	STRV_FOREACH(p, patterns) {
	61	const char q = p;
	62	bool invert;
	63
	64	invert = *q == '!';
	65	q += invert;
	66
	67	if (!invert)
	68	has_positive_rule = true;
	69
	70	if (string && fnmatch(q, string, 0) == 0) {
	71	if (invert)
	72	return false;
	73	else
	74	match = true;
	75	}
	76	}
	77
	78	return has_positive_rule ? match : true;
	79	}
	80
	81	static bool net_condition_test_ifname(char * const patterns, const char ifname, char * const *alternative_names) {
	82	if (net_condition_test_strv(patterns, ifname))
	83	return true;
	84
7e19cc54 YW	85	STRV_FOREACH(p, alternative_names)
	86	if (net_condition_test_strv(patterns, *p))
	87	return true;
	88
	89	return false;
	90	}
	91
	92	static int net_condition_test_property(char * const match_property, sd_device device) {
7e19cc54 YW	93	if (strv_isempty(match_property))
	94	return true;
	95
	96	STRV_FOREACH(p, match_property) {
	97	_cleanup_free_ char *key = NULL;
	98	const char val, dev_val;
	99	bool invert, v;
	100
	101	invert = **p == '!';
	102
	103	val = strchr(*p + invert, '=');
	104	if (!val)
	105	return -EINVAL;
	106
	107	key = strndup(p + invert, val - p - invert);
	108	if (!key)
	109	return -ENOMEM;
	110
	111	val++;
	112
	113	v = device &&
	114	sd_device_get_property_value(device, key, &dev_val) >= 0 &&
	115	fnmatch(val, dev_val, 0) == 0;
	116
	117	if (invert ? v : !v)
	118	return false;
	119	}
	120
	121	return true;
	122	}
	123
1a3caa49	124	int net_match_config(
5722fb89	125	const NetMatch *match,
7e19cc54	126	sd_device *device,
52135071 YW	127	const struct hw_addr_data *hw_addr,
52135071 YW	128	const struct hw_addr_data *permanent_hw_addr,
5722fb89 YW	129	const char *driver,
5722fb89 YW	130	unsigned short iftype,
65022cd7	131	const char *kind,
5722fb89	132	const char *ifname,
7e19cc54	133	char * const *alternative_names,
77f75f4f	134	enum nl80211_iftype wlan_iftype,
5722fb89 YW	135	const char *ssid,
	136	const struct ether_addr *bssid) {
	137
c2b2df60	138	_cleanup_free_ char *iftype_str = NULL;
5722fb89	139	const char *path = NULL;
7e19cc54	140
5722fb89	141	assert(match);
7e19cc54	142
613701a4 YW	143	if (net_get_type_string(device, iftype, &iftype_str) == -ENOMEM)
613701a4 YW	144	return -ENOMEM;
7e19cc54	145
613701a4	146	if (device)
5722fb89	147	(void) sd_device_get_property_value(device, "ID_PATH", &path);
7e19cc54	148
52135071	149	if (match->hw_addr && (!hw_addr \|\| !set_contains(match->hw_addr, hw_addr)))
7e19cc54 YW	150	return false;
7e19cc54 YW	151
52135071 YW	152	if (match->permanent_hw_addr &&
	153	(!permanent_hw_addr \|\|
	154	!set_contains(match->permanent_hw_addr, permanent_hw_addr)))
7e19cc54 YW	155	return false;
7e19cc54 YW	156
5722fb89	157	if (!net_condition_test_strv(match->path, path))
7e19cc54 YW	158	return false;
7e19cc54 YW	159
5722fb89	160	if (!net_condition_test_strv(match->driver, driver))
7e19cc54 YW	161	return false;
7e19cc54 YW	162
5722fb89	163	if (!net_condition_test_strv(match->iftype, iftype_str))
7e19cc54 YW	164	return false;
7e19cc54 YW	165
65022cd7 YW	166	if (!net_condition_test_strv(match->kind, kind))
	167	return false;
	168
5722fb89	169	if (!net_condition_test_ifname(match->ifname, ifname, alternative_names))
7e19cc54 YW	170	return false;
7e19cc54 YW	171
5722fb89	172	if (!net_condition_test_property(match->property, device))
7e19cc54 YW	173	return false;
7e19cc54 YW	174
77f75f4f	175	if (!net_condition_test_strv(match->wlan_iftype, nl80211_iftype_to_string(wlan_iftype)))
7e19cc54 YW	176	return false;
7e19cc54 YW	177
5722fb89	178	if (!net_condition_test_strv(match->ssid, ssid))
7e19cc54 YW	179	return false;
7e19cc54 YW	180
5722fb89	181	if (match->bssid && (!bssid \|\| !set_contains(match->bssid, bssid)))
7e19cc54 YW	182	return false;
	183
	184	return true;
	185	}
	186
	187	int config_parse_net_condition(
	188	const char *unit,
	189	const char *filename,
	190	unsigned line,
	191	const char *section,
	192	unsigned section_line,
	193	const char *lvalue,
	194	int ltype,
	195	const char *rvalue,
	196	void *data,
	197	void *userdata) {
	198
	199	ConditionType cond = ltype;
	200	Condition *list = data, c;
	201	bool negate;
	202
	203	assert(filename);
	204	assert(lvalue);
	205	assert(rvalue);
	206	assert(data);
	207
	208	if (isempty(rvalue)) {
	209	list = condition_free_list_type(list, cond);
	210	return 0;
	211	}
	212
	213	negate = rvalue[0] == '!';
	214	if (negate)
	215	rvalue++;
	216
	217	c = condition_new(cond, rvalue, false, negate);
	218	if (!c)
	219	return log_oom();
	220
	221	/* Drop previous assignment. */
	222	list = condition_free_list_type(list, cond);
	223
	224	LIST_PREPEND(conditions, *list, c);
	225	return 0;
	226	}
	227
	228	int config_parse_match_strv(
	229	const char *unit,
	230	const char *filename,
	231	unsigned line,
	232	const char *section,
	233	unsigned section_line,
	234	const char *lvalue,
	235	int ltype,
	236	const char *rvalue,
	237	void *data,
	238	void *userdata) {
	239
99534007 DT	240	const char *p = ASSERT_PTR(rvalue);
99534007 DT	241	char ***sv = ASSERT_PTR(data);
7e19cc54 YW	242	bool invert;
	243	int r;
	244
	245	assert(filename);
	246	assert(lvalue);
7e19cc54 YW	247
	248	if (isempty(rvalue)) {
	249	sv = strv_free(sv);
	250	return 0;
	251	}
	252
	253	invert = *p == '!';
	254	p += invert;
	255
	256	for (;;) {
	257	_cleanup_free_ char word = NULL, k = NULL;
	258
	259	r = extract_first_word(&p, &word, NULL, EXTRACT_UNQUOTE\|EXTRACT_RETAIN_ESCAPE);
	260	if (r == 0)
	261	return 0;
	262	if (r == -ENOMEM)
	263	return log_oom();
	264	if (r < 0) {
	265	log_syntax(unit, LOG_WARNING, filename, line, r,
	266	"Invalid syntax, ignoring: %s", rvalue);
	267	return 0;
	268	}
	269
	270	if (invert) {
	271	k = strjoin("!", word);
	272	if (!k)
	273	return log_oom();
	274	} else
	275	k = TAKE_PTR(word);
	276
	277	r = strv_consume(sv, TAKE_PTR(k));
	278	if (r < 0)
	279	return log_oom();
	280	}
	281	}
	282
	283	int config_parse_match_ifnames(
	284	const char *unit,
	285	const char *filename,
	286	unsigned line,
	287	const char *section,
	288	unsigned section_line,
	289	const char *lvalue,
	290	int ltype,
	291	const char *rvalue,
	292	void *data,
	293	void *userdata) {
	294
99534007 DT	295	const char *p = ASSERT_PTR(rvalue);
99534007 DT	296	char ***sv = ASSERT_PTR(data);
7e19cc54 YW	297	bool invert;
	298	int r;
	299
	300	assert(filename);
	301	assert(lvalue);
7e19cc54 YW	302
	303	if (isempty(rvalue)) {
	304	sv = strv_free(sv);
	305	return 0;
	306	}
	307
	308	invert = *p == '!';
	309	p += invert;
	310
	311	for (;;) {
	312	_cleanup_free_ char word = NULL, k = NULL;
	313
	314	r = extract_first_word(&p, &word, NULL, 0);
	315	if (r == 0)
	316	return 0;
	317	if (r == -ENOMEM)
	318	return log_oom();
	319	if (r < 0) {
	320	log_syntax(unit, LOG_WARNING, filename, line, 0,
	321	"Failed to parse interface name list, ignoring: %s", rvalue);
	322	return 0;
	323	}
	324
	325	if (!ifname_valid_full(word, ltype)) {
	326	log_syntax(unit, LOG_WARNING, filename, line, 0,
	327	"Interface name is not valid or too long, ignoring assignment: %s", word);
	328	continue;
	329	}
	330
	331	if (invert) {
	332	k = strjoin("!", word);
	333	if (!k)
	334	return log_oom();
	335	} else
	336	k = TAKE_PTR(word);
	337
	338	r = strv_consume(sv, TAKE_PTR(k));
	339	if (r < 0)
	340	return log_oom();
	341	}
	342	}
	343
	344	int config_parse_match_property(
	345	const char *unit,
	346	const char *filename,
	347	unsigned line,
	348	const char *section,
	349	unsigned section_line,
	350	const char *lvalue,
	351	int ltype,
	352	const char *rvalue,
	353	void *data,
	354	void *userdata) {
	355
99534007 DT	356	const char *p = ASSERT_PTR(rvalue);
99534007 DT	357	char ***sv = ASSERT_PTR(data);
7e19cc54 YW	358	bool invert;
	359	int r;
	360
	361	assert(filename);
	362	assert(lvalue);
7e19cc54 YW	363
	364	if (isempty(rvalue)) {
	365	sv = strv_free(sv);
	366	return 0;
	367	}
	368
	369	invert = *p == '!';
	370	p += invert;
	371
	372	for (;;) {
	373	_cleanup_free_ char word = NULL, k = NULL;
	374
	375	r = extract_first_word(&p, &word, NULL, EXTRACT_CUNESCAPE\|EXTRACT_UNQUOTE);
	376	if (r == 0)
	377	return 0;
	378	if (r == -ENOMEM)
	379	return log_oom();
	380	if (r < 0) {
	381	log_syntax(unit, LOG_WARNING, filename, line, 0,
	382	"Invalid syntax, ignoring: %s", rvalue);
	383	return 0;
	384	}
	385
	386	if (!env_assignment_is_valid(word)) {
	387	log_syntax(unit, LOG_WARNING, filename, line, 0,
	388	"Invalid property or value, ignoring assignment: %s", word);
	389	continue;
	390	}
	391
	392	if (invert) {
	393	k = strjoin("!", word);
	394	if (!k)
	395	return log_oom();
	396	} else
	397	k = TAKE_PTR(word);
	398
	399	r = strv_consume(sv, TAKE_PTR(k));
	400	if (r < 0)
	401	return log_oom();
	402	}
	403	}