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

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

#include <netinet/ether.h>

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