Harald Welte | 908085c | 2014-10-01 16:18:11 +0800 | [diff] [blame] | 1 | #include <stdio.h> |
| 2 | #include <stdint.h> |
| 3 | #include <stdlib.h> |
| 4 | #include <string.h> |
| 5 | |
| 6 | #include <osmocom/gsm/apn.h> |
| 7 | |
| 8 | #define APN_OI_GPRS_FMT "mnc%03u.mcc%03u.gprs" |
| 9 | #define APN_GPRS_FMT "%s.mnc%03u.mcc%03u.gprs" |
| 10 | |
| 11 | static char apn_strbuf[APN_MAXLEN+1]; |
| 12 | |
| 13 | char *osmo_apn_qualify(unsigned int mcc, unsigned int mnc, const char *ni) |
| 14 | { |
| 15 | snprintf(apn_strbuf, sizeof(apn_strbuf)-1, APN_GPRS_FMT, |
| 16 | ni, mnc, mcc); |
| 17 | apn_strbuf[sizeof(apn_strbuf)-1] = '\0'; |
| 18 | |
| 19 | return apn_strbuf; |
| 20 | } |
| 21 | |
| 22 | char *osmo_apn_qualify_from_imsi(const char *imsi, |
| 23 | const char *ni, int have_3dig_mnc) |
| 24 | { |
| 25 | char cbuf[3+1], nbuf[3+1]; |
| 26 | |
| 27 | strncpy(cbuf, imsi, 3); |
| 28 | cbuf[3] = '\0'; |
| 29 | |
| 30 | if (have_3dig_mnc) { |
| 31 | strncpy(nbuf, imsi+3, 3); |
| 32 | nbuf[3] = '\0'; |
| 33 | } else { |
| 34 | strncpy(nbuf, imsi+3, 2); |
| 35 | nbuf[2] = '\0'; |
| 36 | } |
| 37 | return osmo_apn_qualify(atoi(cbuf), atoi(nbuf), ni); |
| 38 | } |
Jacob Erlbeck | 8114294 | 2015-11-17 08:42:05 +0100 | [diff] [blame] | 39 | |
| 40 | /** |
| 41 | * Convert an encoded APN into a dot-separated string. |
| 42 | * |
| 43 | * \param out_str the destination buffer (size must be >= max(app_enc_len,1)) |
| 44 | * \param apn_enc the encoded APN |
| 45 | * \param apn_enc_len the length of the encoded APN |
| 46 | * |
| 47 | * \returns out_str on success and NULL otherwise |
| 48 | */ |
| 49 | char * osmo_apn_to_str(char *out_str, const uint8_t *apn_enc, size_t apn_enc_len) |
| 50 | { |
| 51 | char *str = out_str; |
| 52 | size_t rest_chars = apn_enc_len; |
| 53 | |
| 54 | while (rest_chars > 0 && apn_enc[0]) { |
| 55 | size_t label_size = apn_enc[0]; |
| 56 | if (label_size + 1 > rest_chars) |
| 57 | return NULL; |
| 58 | |
| 59 | memmove(str, apn_enc + 1, label_size); |
| 60 | str += label_size; |
| 61 | rest_chars -= label_size + 1; |
| 62 | apn_enc += label_size + 1; |
| 63 | |
| 64 | if (rest_chars) |
| 65 | *(str++) = '.'; |
| 66 | } |
| 67 | str[0] = '\0'; |
| 68 | |
| 69 | return out_str; |
| 70 | } |
| 71 | |
| 72 | /** |
| 73 | * Convert a dot-separated string into an encoded APN. |
| 74 | * |
| 75 | * \param apn_enc the encoded APN |
| 76 | * \param max_apn_enc_len the size of the apn_enc buffer |
| 77 | * \param str the source string |
| 78 | * |
| 79 | * \returns out_str on success and NULL otherwise |
| 80 | */ |
| 81 | int osmo_apn_from_str(uint8_t *apn_enc, size_t max_apn_enc_len, const char *str) |
| 82 | { |
| 83 | uint8_t *last_len_field; |
| 84 | int len; |
| 85 | |
| 86 | /* Can we even write the length field to the output? */ |
| 87 | if (max_apn_enc_len == 0) |
| 88 | return -1; |
| 89 | |
| 90 | /* Remember where we need to put the length once we know it */ |
| 91 | last_len_field = apn_enc; |
| 92 | len = 1; |
| 93 | apn_enc += 1; |
| 94 | |
| 95 | while (str[0]) { |
| 96 | if (len >= max_apn_enc_len) |
| 97 | return -1; |
| 98 | |
| 99 | if (str[0] == '.') { |
| 100 | *last_len_field = (apn_enc - last_len_field) - 1; |
| 101 | last_len_field = apn_enc; |
| 102 | } else { |
| 103 | *apn_enc = str[0]; |
| 104 | } |
| 105 | apn_enc += 1; |
| 106 | str += 1; |
| 107 | len += 1; |
| 108 | } |
| 109 | |
| 110 | *last_len_field = (apn_enc - last_len_field) - 1; |
| 111 | |
| 112 | return len; |
| 113 | } |