diff options
Diffstat (limited to 'reglib.c')
| -rw-r--r-- | reglib.c | 74 |
1 files changed, 74 insertions, 0 deletions
@@ -7,6 +7,8 @@ #include <stdlib.h> #include <sys/mman.h> #include <fcntl.h> +#include <stdbool.h> +#include <unistd.h> #include <arpa/inet.h> /* ntohl */ @@ -281,3 +283,75 @@ reglib_get_country_idx(unsigned int idx, const char *file) return rd; } + +struct ieee80211_regdomain * +reglib_get_country_alpha2(const char *alpha2, const char *file) +{ + int fd; + struct stat stat; + uint8_t *db; + struct regdb_file_header *header; + struct regdb_file_reg_country *countries; + int dblen, siglen, num_countries; + struct ieee80211_regdomain *rd = NULL; + struct regdb_file_reg_country *country; + unsigned int i; + bool found_country = false; + + fd = open(file, O_RDONLY); + + if (fd < 0) + return NULL; + + if (fstat(fd, &stat)) + return NULL; + + dblen = stat.st_size; + + db = mmap(NULL, dblen, PROT_READ, MAP_PRIVATE, fd, 0); + if (db == MAP_FAILED) + return NULL; + + header = crda_get_file_ptr(db, dblen, sizeof(*header), 0); + + if (ntohl(header->magic) != REGDB_MAGIC) + return NULL; + + if (ntohl(header->version) != REGDB_VERSION) + return NULL; + + siglen = ntohl(header->signature_length); + /* adjust dblen so later sanity checks don't run into the signature */ + dblen -= siglen; + + if (dblen <= (int)sizeof(*header)) + return NULL; + + /* verify signature */ + if (!crda_verify_db_signature(db, dblen, siglen)) + return NULL; + + num_countries = ntohl(header->reg_country_num); + countries = crda_get_file_ptr(db, dblen, + sizeof(struct regdb_file_reg_country) * num_countries, + header->reg_country_ptr); + + for (i = 0; i < num_countries; i++) { + country = countries + i; + if (memcmp(country->alpha2, alpha2, 2) == 0) { + found_country = 1; + break; + } + } + + if (!found_country) + goto out; + + rd = country2rd(db, dblen, country); + if (!rd) + goto out; + +out: + close(fd); + return rd; +} |