diff options
Diffstat (limited to 'src/shared/net-condition.c')
-rw-r--r-- | src/shared/net-condition.c | 428 |
1 files changed, 428 insertions, 0 deletions
diff --git a/src/shared/net-condition.c b/src/shared/net-condition.c new file mode 100644 index 0000000000..bdc8bc3fe4 --- /dev/null +++ b/src/shared/net-condition.c @@ -0,0 +1,428 @@ +/* SPDX-License-Identifier: LGPL-2.1+ */ + +#include <netinet/ether.h> + +#include "condition.h" +#include "env-util.h" +#include "log.h" +#include "net-condition.h" +#include "network-util.h" +#include "socket-util.h" +#include "string-table.h" +#include "strv.h" + +void net_match_clear(NetMatch *match) { + if (!match) + return; + + match->mac = set_free_free(match->mac); + match->permanent_mac = set_free_free(match->permanent_mac); + match->path = strv_free(match->path); + match->driver = strv_free(match->driver); + match->iftype = strv_free(match->iftype); + match->ifname = strv_free(match->ifname); + match->property = strv_free(match->property); + match->wifi_iftype = strv_free(match->wifi_iftype); + match->ssid = strv_free(match->ssid); + match->bssid = set_free_free(match->bssid); +} + +bool net_match_is_empty(const NetMatch *match) { + assert(match); + + return + set_isempty(match->mac) && + set_isempty(match->permanent_mac) && + strv_isempty(match->path) && + strv_isempty(match->driver) && + strv_isempty(match->iftype) && + strv_isempty(match->ifname) && + strv_isempty(match->property) && + strv_isempty(match->wifi_iftype) && + strv_isempty(match->ssid) && + set_isempty(match->bssid); +} + +static bool net_condition_test_strv(char * const *patterns, const char *string) { + char * const *p; + 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; + + char * const *p; + 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) { + char * const *p; + + 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; +} + +static const char *const wifi_iftype_table[NL80211_IFTYPE_MAX+1] = { + [NL80211_IFTYPE_ADHOC] = "ad-hoc", + [NL80211_IFTYPE_STATION] = "station", + [NL80211_IFTYPE_AP] = "ap", + [NL80211_IFTYPE_AP_VLAN] = "ap-vlan", + [NL80211_IFTYPE_WDS] = "wds", + [NL80211_IFTYPE_MONITOR] = "monitor", + [NL80211_IFTYPE_MESH_POINT] = "mesh-point", + [NL80211_IFTYPE_P2P_CLIENT] = "p2p-client", + [NL80211_IFTYPE_P2P_GO] = "p2p-go", + [NL80211_IFTYPE_P2P_DEVICE] = "p2p-device", + [NL80211_IFTYPE_OCB] = "ocb", + [NL80211_IFTYPE_NAN] = "nan", +}; + +DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(wifi_iftype, enum nl80211_iftype); + +bool net_match_config( + const NetMatch *match, + sd_device *device, + const struct ether_addr *mac, + const struct ether_addr *permanent_mac, + const char *driver, + unsigned short iftype, + const char *ifname, + char * const *alternative_names, + enum nl80211_iftype wifi_iftype, + const char *ssid, + const struct ether_addr *bssid) { + + _cleanup_free_ char *iftype_str; + const char *path = NULL; + + assert(match); + + iftype_str = link_get_type_string(device, iftype); + + if (device) { + const char *mac_str; + + (void) sd_device_get_property_value(device, "ID_PATH", &path); + if (!driver) + (void) sd_device_get_property_value(device, "ID_NET_DRIVER", &driver); + if (!ifname) + (void) sd_device_get_sysname(device, &ifname); + if (!mac && + sd_device_get_sysattr_value(device, "address", &mac_str) >= 0) + mac = ether_aton(mac_str); + } + + if (match->mac && (!mac || !set_contains(match->mac, mac))) + return false; + + if (match->permanent_mac && + (!permanent_mac || + ether_addr_is_null(permanent_mac) || + !set_contains(match->permanent_mac, permanent_mac))) + 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_ifname(match->ifname, ifname, alternative_names)) + return false; + + if (!net_condition_test_property(match->property, device)) + return false; + + if (!net_condition_test_strv(match->wifi_iftype, wifi_iftype_to_string(wifi_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 = rvalue; + char ***sv = data; + bool invert; + int r; + + assert(filename); + assert(lvalue); + assert(rvalue); + assert(data); + + 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 = rvalue; + char ***sv = data; + bool invert; + int r; + + assert(filename); + assert(lvalue); + assert(rvalue); + assert(data); + + 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 = rvalue; + char ***sv = data; + bool invert; + int r; + + assert(filename); + assert(lvalue); + assert(rvalue); + assert(data); + + 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(); + } +} |