bus: parse uid/gid/pid/tid meta data from kdbus messages

[elogind.git] / src / libsystemd-bus / bus-internal.c

diff --git a/src/libsystemd-bus/bus-internal.c b/src/libsystemd-bus/bus-internal.c
index e58a8b1da1963405951666367b7bc5a2be738ac6..317f6a8a9cdea436647a59536b670fa6492236dc 100644 (file)
--- a/src/libsystemd-bus/bus-internal.c
+++ b/src/libsystemd-bus/bus-internal.c
@@ -60,3 +60,172 @@ bool object_path_is_valid(const char *p) {
 
         return true;
 }
 
         return true;
 }

+
+bool interface_name_is_valid(const char *p) {
+        const char *q;
+        bool dot, found_dot;
+
+        if (isempty(p))
+                return false;
+
+        for (dot = true, q = p; *q; q++)
+                if (*q == '.') {
+                        if (dot)
+                                return false;
+
+                        found_dot = dot = true;
+                } else {
+                        bool good;
+
+                        good =
+                                (*q >= 'a' && *q <= 'z') ||
+                                (*q >= 'A' && *q <= 'Z') ||
+                                (!dot && *q >= '0' && *q <= '9') ||
+                                *q == '_';
+
+                        if (!good)
+                                return false;
+
+                        dot = false;
+                }
+
+        if (q - p > 255)
+                return false;
+
+        if (dot)
+                return false;
+
+        if (!found_dot)
+                return false;
+
+        return true;
+}
+
+bool service_name_is_valid(const char *p) {
+        const char *q;
+        bool dot, found_dot, unique;
+
+        if (isempty(p))
+                return false;
+
+        unique = p[0] == ':';
+
+        for (dot = true, q = unique ? p+1 : p; *q; q++)
+                if (*q == '.') {
+                        if (dot)
+                                return false;
+
+                        found_dot = dot = true;
+                } else {
+                        bool good;
+
+                        good =
+                                (*q >= 'a' && *q <= 'z') ||
+                                (*q >= 'A' && *q <= 'Z') ||
+                                ((!dot || unique) && *q >= '0' && *q <= '9') ||
+                                *q == '_' || *q == '-';
+
+                        if (!good)
+                                return false;
+
+                        dot = false;
+                }
+
+        if (q - p > 255)
+                return false;
+
+        if (dot)
+                return false;
+
+        if (!found_dot)
+                return false;
+
+        return true;
+
+}
+
+bool member_name_is_valid(const char *p) {
+        const char *q;
+
+        if (isempty(p))
+                return false;
+
+        for (q = p; *q; q++) {
+                bool good;
+
+                good =
+                        (*q >= 'a' && *q <= 'z') ||
+                        (*q >= 'A' && *q <= 'Z') ||
+                        (*q >= '0' && *q <= '9') ||
+                        *q == '_';
+
+                if (!good)
+                        return false;
+        }
+
+        if (q - p > 255)
+                return false;
+
+        return true;
+}
+
+static bool complex_pattern_check(char c, const char *a, const char *b) {
+        bool separator = false;
+
+        for (;;) {
+                if (*a != *b)
+                        return (separator && (*a == 0 || *b == 0)) ||
+                                (*a == 0 && *b == c && b[1] == 0) ||
+                                (*b == 0 && *a == c && a[1] == 0);
+
+                if (*a == 0)
+                        return true;
+
+                separator = *a == c;
+
+                a++, b++;
+        }
+}
+
+bool namespace_complex_pattern(const char *pattern, const char *value) {
+        return complex_pattern_check('.', pattern, value);
+}
+
+bool path_complex_pattern(const char *pattern, const char *value) {
+        return complex_pattern_check('/', pattern, value);
+}
+
+static bool simple_pattern_check(char c, const char *a, const char *b) {
+        for (;;) {
+                if (*a != *b)
+                        return *a == 0 && *b == c;
+
+                if (*a == 0)
+                        return true;
+
+                a++, b++;
+        }
+}
+
+bool namespace_simple_pattern(const char *pattern, const char *value) {
+        return simple_pattern_check('.', pattern, value);
+}
+
+bool path_simple_pattern(const char *pattern, const char *value) {
+        return simple_pattern_check('/', pattern, value);
+}
+
+int bus_message_type_from_string(const char *s, uint8_t *u) {
+        if (streq(s, "signal"))
+                *u = SD_BUS_MESSAGE_TYPE_SIGNAL;
+        else if (streq(s, "method_call"))
+                *u = SD_BUS_MESSAGE_TYPE_METHOD_CALL;
+        else if (streq(s, "error"))
+                *u = SD_BUS_MESSAGE_TYPE_METHOD_ERROR;
+        else if (streq(s, "method_return"))
+                *u = SD_BUS_MESSAGE_TYPE_METHOD_RETURN;
+        else
+                return -EINVAL;
+
+        return 0;
+}