diff options
Diffstat (limited to 'src/libsystemd/sd-bus/bus-internal.c')
| -rw-r--r-- | src/libsystemd/sd-bus/bus-internal.c | 338 |
1 files changed, 338 insertions, 0 deletions
diff --git a/src/libsystemd/sd-bus/bus-internal.c b/src/libsystemd/sd-bus/bus-internal.c new file mode 100644 index 0000000..a249b84 --- /dev/null +++ b/src/libsystemd/sd-bus/bus-internal.c @@ -0,0 +1,338 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ + +#include "alloc-util.h" +#include "bus-internal.h" +#include "bus-message.h" +#include "escape.h" +#include "hexdecoct.h" +#include "string-util.h" + +bool object_path_is_valid(const char *p) { + const char *q; + bool slash; + + if (!p) + return false; + + if (p[0] != '/') + return false; + + if (p[1] == 0) + return true; + + for (slash = true, q = p+1; *q; q++) + if (*q == '/') { + if (slash) + return false; + + slash = true; + } else { + bool good; + + good = ascii_isalpha(*q) || + ascii_isdigit(*q) || + *q == '_'; + + if (!good) + return false; + + slash = false; + } + + if (slash) + return false; + + return (q - p) <= BUS_PATH_SIZE_MAX; +} + +char* object_path_startswith(const char *a, const char *b) { + const char *p; + + if (!object_path_is_valid(a) || + !object_path_is_valid(b)) + return NULL; + + if (streq(b, "/")) + return (char*) a + 1; + + p = startswith(a, b); + if (!p) + return NULL; + + if (*p == 0) + return (char*) p; + + if (*p == '/') + return (char*) p + 1; + + return NULL; +} + +bool interface_name_is_valid(const char *p) { + const char *q; + bool dot, found_dot = false; + + 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 = + ascii_isalpha(*q) || + (!dot && ascii_isdigit(*q)) || + *q == '_'; + + if (!good) { + if (DEBUG_LOGGING) { + _cleanup_free_ char *iface = cescape(p); + log_debug("The interface %s is invalid as it contains special character", strnull(iface)); + } + return false; + } + + dot = false; + } + + if (q - p > SD_BUS_MAXIMUM_NAME_LENGTH) + 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 = false, 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 = + ascii_isalpha(*q) || + ((!dot || unique) && ascii_isdigit(*q)) || + IN_SET(*q, '_', '-'); + + if (!good) + return false; + + dot = false; + } + + if (q - p > SD_BUS_MAXIMUM_NAME_LENGTH) + 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 = + ascii_isalpha(*q) || + ascii_isdigit(*q) || + *q == '_'; + + if (!good) + return false; + } + + if (q - p > SD_BUS_MAXIMUM_NAME_LENGTH) + return false; + + return true; +} + +/* + * Complex pattern match + * This checks whether @a is a 'complex-prefix' of @b, or @b is a + * 'complex-prefix' of @a, based on strings that consist of labels with @c as + * separator. This function returns true if: + * - both strings are equal + * - either is a prefix of the other and ends with @c + * The second rule makes sure that either string needs to be fully included in + * the other, and the string which is considered the prefix needs to end with a + * separator. + */ +static bool complex_pattern_check(char c, const char *a, const char *b) { + bool separator = false; + + if (!a && !b) + return true; + + if (!a || !b) + return false; + + for (;;) { + if (*a != *b) + return (separator && (*a == 0 || *b == 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); +} + +/* + * Simple pattern match + * This checks whether @a is a 'simple-prefix' of @b, based on strings that + * consist of labels with @c as separator. This function returns true, if: + * - if @a and @b are equal + * - if @a is a prefix of @b, and the first following character in @b (or the + * last character in @a) is @c + * The second rule basically makes sure that if @a is a prefix of @b, then @b + * must follow with a new label separated by @c. It cannot extend the label. + */ +static bool simple_pattern_check(char c, const char *a, const char *b) { + bool separator = false; + + if (!a && !b) + return true; + + if (!a || !b) + return false; + + for (;;) { + if (*a != *b) + return *a == 0 && (*b == c || separator); + + if (*a == 0) + return true; + + separator = *a == c; + + 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_SIGNAL; + else if (streq(s, "method_call")) + *u = SD_BUS_MESSAGE_METHOD_CALL; + else if (streq(s, "error")) + *u = SD_BUS_MESSAGE_METHOD_ERROR; + else if (streq(s, "method_return")) + *u = SD_BUS_MESSAGE_METHOD_RETURN; + else + return -EINVAL; + + return 0; +} + +const char *bus_message_type_to_string(uint8_t u) { + if (u == SD_BUS_MESSAGE_SIGNAL) + return "signal"; + else if (u == SD_BUS_MESSAGE_METHOD_CALL) + return "method_call"; + else if (u == SD_BUS_MESSAGE_METHOD_ERROR) + return "error"; + else if (u == SD_BUS_MESSAGE_METHOD_RETURN) + return "method_return"; + else + return NULL; +} + +char *bus_address_escape(const char *v) { + const char *a; + char *r, *b; + + r = new(char, strlen(v)*3+1); + if (!r) + return NULL; + + for (a = v, b = r; *a; a++) { + + if (ascii_isdigit(*a) || + ascii_isalpha(*a) || + strchr("_-/.", *a)) + *(b++) = *a; + else { + *(b++) = '%'; + *(b++) = hexchar(*a >> 4); + *(b++) = hexchar(*a & 0xF); + } + } + + *b = 0; + return r; +} + +int bus_maybe_reply_error(sd_bus_message *m, int r, sd_bus_error *error) { + assert(m); + + if (sd_bus_error_is_set(error) || r < 0) { + if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL) + sd_bus_reply_method_errno(m, r, error); + } else + return r; + + log_debug("Failed to process message type=%s sender=%s destination=%s path=%s interface=%s member=%s cookie=%" PRIu64 " reply_cookie=%" PRIu64 " signature=%s error-name=%s error-message=%s: %s", + bus_message_type_to_string(m->header->type), + strna(sd_bus_message_get_sender(m)), + strna(sd_bus_message_get_destination(m)), + strna(sd_bus_message_get_path(m)), + strna(sd_bus_message_get_interface(m)), + strna(sd_bus_message_get_member(m)), + BUS_MESSAGE_COOKIE(m), + m->reply_cookie, + strna(m->root_container.signature), + strna(m->error.name), + strna(m->error.message), + bus_error_message(error, r)); + + return 1; +} |