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-rw-r--r--src/shared/net-condition.c399
1 files changed, 399 insertions, 0 deletions
diff --git a/src/shared/net-condition.c b/src/shared/net-condition.c
new file mode 100644
index 0000000..d8b0fef
--- /dev/null
+++ b/src/shared/net-condition.c
@@ -0,0 +1,399 @@
+/* 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();
+ }
+}
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