mirror of https://gerrit.osmocom.org/libosmocore
114 lines
2.4 KiB
C
114 lines
2.4 KiB
C
#include <stdio.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <osmocom/gsm/apn.h>
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#define APN_OI_GPRS_FMT "mnc%03u.mcc%03u.gprs"
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#define APN_GPRS_FMT "%s.mnc%03u.mcc%03u.gprs"
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static char apn_strbuf[APN_MAXLEN+1];
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char *osmo_apn_qualify(unsigned int mcc, unsigned int mnc, const char *ni)
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{
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snprintf(apn_strbuf, sizeof(apn_strbuf)-1, APN_GPRS_FMT,
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ni, mnc, mcc);
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apn_strbuf[sizeof(apn_strbuf)-1] = '\0';
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return apn_strbuf;
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}
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char *osmo_apn_qualify_from_imsi(const char *imsi,
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const char *ni, int have_3dig_mnc)
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{
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char cbuf[3+1], nbuf[3+1];
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strncpy(cbuf, imsi, 3);
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cbuf[3] = '\0';
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if (have_3dig_mnc) {
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strncpy(nbuf, imsi+3, 3);
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nbuf[3] = '\0';
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} else {
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strncpy(nbuf, imsi+3, 2);
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nbuf[2] = '\0';
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}
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return osmo_apn_qualify(atoi(cbuf), atoi(nbuf), ni);
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}
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/**
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* Convert an encoded APN into a dot-separated string.
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*
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* \param out_str the destination buffer (size must be >= max(app_enc_len,1))
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* \param apn_enc the encoded APN
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* \param apn_enc_len the length of the encoded APN
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*
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* \returns out_str on success and NULL otherwise
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*/
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char * osmo_apn_to_str(char *out_str, const uint8_t *apn_enc, size_t apn_enc_len)
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{
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char *str = out_str;
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size_t rest_chars = apn_enc_len;
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while (rest_chars > 0 && apn_enc[0]) {
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size_t label_size = apn_enc[0];
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if (label_size + 1 > rest_chars)
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return NULL;
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memmove(str, apn_enc + 1, label_size);
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str += label_size;
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rest_chars -= label_size + 1;
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apn_enc += label_size + 1;
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if (rest_chars)
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*(str++) = '.';
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}
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str[0] = '\0';
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return out_str;
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}
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/**
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* Convert a dot-separated string into an encoded APN.
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*
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* \param apn_enc the encoded APN
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* \param max_apn_enc_len the size of the apn_enc buffer
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* \param str the source string
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*
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* \returns out_str on success and NULL otherwise
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*/
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int osmo_apn_from_str(uint8_t *apn_enc, size_t max_apn_enc_len, const char *str)
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{
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uint8_t *last_len_field;
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int len;
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/* Can we even write the length field to the output? */
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if (max_apn_enc_len == 0)
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return -1;
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/* Remember where we need to put the length once we know it */
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last_len_field = apn_enc;
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len = 1;
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apn_enc += 1;
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while (str[0]) {
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if (len >= max_apn_enc_len)
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return -1;
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if (str[0] == '.') {
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*last_len_field = (apn_enc - last_len_field) - 1;
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last_len_field = apn_enc;
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} else {
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*apn_enc = str[0];
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}
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apn_enc += 1;
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str += 1;
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len += 1;
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}
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*last_len_field = (apn_enc - last_len_field) - 1;
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return len;
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}
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