| /* |
| * Message rewriting functionality |
| */ |
| /* |
| * (C) 2010-2013 by Holger Hans Peter Freyther <zecke@selfish.org> |
| * (C) 2010-2013 by On-Waves |
| * All Rights Reserved |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU Affero General Public License as published by |
| * the Free Software Foundation; either version 3 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU Affero General Public License for more details. |
| * |
| * You should have received a copy of the GNU Affero General Public License |
| * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| * |
| */ |
| |
| #include <openbsc/bsc_nat.h> |
| #include <openbsc/bsc_nat_sccp.h> |
| #include <openbsc/bsc_msc.h> |
| #include <openbsc/gsm_data.h> |
| #include <openbsc/debug.h> |
| #include <openbsc/ipaccess.h> |
| #include <openbsc/nat_rewrite_trie.h> |
| |
| #include <osmocom/core/linuxlist.h> |
| #include <osmocom/core/talloc.h> |
| #include <osmocom/gsm/gsm0808.h> |
| #include <osmocom/gsm/ipa.h> |
| |
| #include <osmocom/gsm/protocol/gsm_08_08.h> |
| #include <osmocom/gsm/protocol/gsm_04_11.h> |
| |
| #include <osmocom/sccp/sccp.h> |
| |
| static char *trie_lookup(struct nat_rewrite *trie, const char *number, |
| regoff_t off, void *ctx) |
| { |
| struct nat_rewrite_rule *rule; |
| |
| if (!trie) { |
| LOGP(DCC, LOGL_ERROR, |
| "Asked to do a table lookup but no table.\n"); |
| return NULL; |
| } |
| |
| rule = nat_rewrite_lookup(trie, number); |
| if (!rule) { |
| LOGP(DCC, LOGL_DEBUG, |
| "Couldn't find a prefix rule for %s\n", number); |
| return NULL; |
| } |
| |
| return talloc_asprintf(ctx, "%s%s", rule->rewrite, &number[off]); |
| } |
| |
| static char *match_and_rewrite_number(void *ctx, const char *number, |
| const char *imsi, struct llist_head *list, |
| struct nat_rewrite *trie) |
| { |
| struct bsc_nat_num_rewr_entry *entry; |
| char *new_number = NULL; |
| |
| /* need to find a replacement and then fix it */ |
| llist_for_each_entry(entry, list, list) { |
| regmatch_t matches[2]; |
| |
| /* check the IMSI match */ |
| if (regexec(&entry->msisdn_reg, imsi, 0, NULL, 0) != 0) |
| continue; |
| |
| /* this regexp matches... */ |
| if (regexec(&entry->num_reg, number, 2, matches, 0) == 0 |
| && matches[1].rm_eo != -1) { |
| if (entry->is_prefix_lookup) |
| new_number = trie_lookup(trie, number, |
| matches[1].rm_so, ctx); |
| else |
| new_number = talloc_asprintf(ctx, "%s%s", |
| entry->replace, |
| &number[matches[1].rm_so]); |
| } |
| |
| if (new_number) |
| break; |
| } |
| |
| return new_number; |
| } |
| |
| static char *rewrite_isdn_number(struct bsc_nat *nat, struct llist_head *rewr_list, |
| void *ctx, const char *imsi, |
| struct gsm_mncc_number *called) |
| { |
| char int_number[sizeof(called->number) + 2]; |
| char *number = called->number; |
| |
| if (llist_empty(&nat->num_rewr)) { |
| LOGP(DCC, LOGL_DEBUG, "Rewrite rules empty.\n"); |
| return NULL; |
| } |
| |
| /* only ISDN plan */ |
| if (called->plan != 1) { |
| LOGP(DCC, LOGL_DEBUG, "Called plan is not 1 it was %d\n", |
| called->plan); |
| return NULL; |
| } |
| |
| /* international, prepend */ |
| if (called->type == 1) { |
| int_number[0] = '+'; |
| memcpy(&int_number[1], number, strlen(number) + 1); |
| number = int_number; |
| } |
| |
| return match_and_rewrite_number(ctx, number, |
| imsi, rewr_list, nat->num_rewr_trie); |
| } |
| |
| static void update_called_number(struct gsm_mncc_number *called, |
| const char *chosen_number) |
| { |
| if (strncmp(chosen_number, "00", 2) == 0) { |
| called->type = 1; |
| strncpy(called->number, chosen_number + 2, sizeof(called->number)); |
| } else { |
| /* rewrite international to unknown */ |
| if (called->type == 1) |
| called->type = 0; |
| strncpy(called->number, chosen_number, sizeof(called->number)); |
| } |
| |
| called->number[sizeof(called->number) - 1] = '\0'; |
| } |
| |
| /** |
| * Rewrite non global numbers... according to rules based on the IMSI |
| */ |
| static struct msgb *rewrite_setup(struct bsc_nat *nat, struct msgb *msg, |
| struct bsc_nat_parsed *parsed, const char *imsi, |
| struct gsm48_hdr *hdr48, const uint32_t len) |
| { |
| struct tlv_parsed tp; |
| unsigned int payload_len; |
| struct gsm_mncc_number called; |
| struct msgb *out; |
| char *new_number_pre = NULL, *new_number_post = NULL, *chosen_number; |
| uint8_t *outptr; |
| const uint8_t *msgptr; |
| int sec_len; |
| |
| /* decode and rewrite the message */ |
| payload_len = len - sizeof(*hdr48); |
| tlv_parse(&tp, &gsm48_att_tlvdef, hdr48->data, payload_len, 0, 0); |
| |
| /* no number, well let us ignore it */ |
| if (!TLVP_PRESENT(&tp, GSM48_IE_CALLED_BCD)) |
| return NULL; |
| |
| memset(&called, 0, sizeof(called)); |
| gsm48_decode_called(&called, |
| TLVP_VAL(&tp, GSM48_IE_CALLED_BCD) - 1); |
| |
| /* check if it looks international and stop */ |
| LOGP(DCC, LOGL_DEBUG, |
| "Pre-Rewrite for IMSI(%s) Plan(%d) Type(%d) Number(%s)\n", |
| imsi, called.plan, called.type, called.number); |
| new_number_pre = rewrite_isdn_number(nat, &nat->num_rewr, msg, imsi, &called); |
| |
| if (!new_number_pre) { |
| LOGP(DCC, LOGL_DEBUG, "No IMSI(%s) match found, returning message.\n", |
| imsi); |
| return NULL; |
| } |
| |
| if (strlen(new_number_pre) > sizeof(called.number)) { |
| LOGP(DCC, LOGL_ERROR, "Number %s is too long for structure.\n", |
| new_number_pre); |
| talloc_free(new_number_pre); |
| return NULL; |
| } |
| update_called_number(&called, new_number_pre); |
| |
| /* another run through the re-write engine with other rules */ |
| LOGP(DCC, LOGL_DEBUG, |
| "Post-Rewrite for IMSI(%s) Plan(%d) Type(%d) Number(%s)\n", |
| imsi, called.plan, called.type, called.number); |
| new_number_post = rewrite_isdn_number(nat, &nat->num_rewr_post, msg, |
| imsi, &called); |
| chosen_number = new_number_post ? new_number_post : new_number_pre; |
| |
| |
| if (strlen(chosen_number) > sizeof(called.number)) { |
| LOGP(DCC, LOGL_ERROR, "Number %s is too long for structure.\n", |
| chosen_number); |
| talloc_free(new_number_pre); |
| talloc_free(new_number_post); |
| return NULL; |
| } |
| |
| /* |
| * Need to create a new message now based on the old onew |
| * with a new number. We can sadly not patch this in place |
| * so we will need to regenerate it. |
| */ |
| |
| out = msgb_alloc_headroom(4096, 128, "changed-setup"); |
| if (!out) { |
| LOGP(DCC, LOGL_ERROR, "Failed to allocate.\n"); |
| talloc_free(new_number_pre); |
| talloc_free(new_number_post); |
| return NULL; |
| } |
| |
| /* copy the header */ |
| outptr = msgb_put(out, sizeof(*hdr48)); |
| memcpy(outptr, hdr48, sizeof(*hdr48)); |
| |
| /* copy everything up to the number */ |
| sec_len = TLVP_VAL(&tp, GSM48_IE_CALLED_BCD) - 2 - &hdr48->data[0]; |
| outptr = msgb_put(out, sec_len); |
| memcpy(outptr, &hdr48->data[0], sec_len); |
| |
| /* create the new number */ |
| update_called_number(&called, chosen_number); |
| LOGP(DCC, LOGL_DEBUG, |
| "Chosen number for IMSI(%s) is Plan(%d) Type(%d) Number(%s)\n", |
| imsi, called.plan, called.type, called.number); |
| gsm48_encode_called(out, &called); |
| |
| /* copy thre rest */ |
| msgptr = TLVP_VAL(&tp, GSM48_IE_CALLED_BCD) + |
| TLVP_LEN(&tp, GSM48_IE_CALLED_BCD); |
| sec_len = payload_len - (msgptr - &hdr48->data[0]); |
| outptr = msgb_put(out, sec_len); |
| memcpy(outptr, msgptr, sec_len); |
| |
| talloc_free(new_number_pre); |
| talloc_free(new_number_post); |
| return out; |
| } |
| |
| /** |
| * Find a new SMSC address, returns an allocated string that needs to be |
| * freed or is NULL. |
| */ |
| static char *find_new_smsc(struct bsc_nat *nat, void *ctx, const char *imsi, |
| const char *smsc_addr, const char *dest_nr) |
| { |
| struct bsc_nat_num_rewr_entry *entry; |
| char *new_number = NULL; |
| uint8_t dest_match = llist_empty(&nat->tpdest_match); |
| |
| /* We will find a new number now */ |
| llist_for_each_entry(entry, &nat->smsc_rewr, list) { |
| regmatch_t matches[2]; |
| |
| /* check the IMSI match */ |
| if (regexec(&entry->msisdn_reg, imsi, 0, NULL, 0) != 0) |
| continue; |
| |
| /* this regexp matches... */ |
| if (regexec(&entry->num_reg, smsc_addr, 2, matches, 0) == 0 && |
| matches[1].rm_eo != -1) |
| new_number = talloc_asprintf(ctx, "%s%s", |
| entry->replace, |
| &smsc_addr[matches[1].rm_so]); |
| if (new_number) |
| break; |
| } |
| |
| if (!new_number) |
| return NULL; |
| |
| /* |
| * now match the number against another list |
| */ |
| llist_for_each_entry(entry, &nat->tpdest_match, list) { |
| /* check the IMSI match */ |
| if (regexec(&entry->msisdn_reg, imsi, 0, NULL, 0) != 0) |
| continue; |
| |
| if (regexec(&entry->num_reg, dest_nr, 0, NULL, 0) == 0) { |
| dest_match = 1; |
| break; |
| } |
| } |
| |
| if (!dest_match) { |
| talloc_free(new_number); |
| return NULL; |
| } |
| |
| return new_number; |
| } |
| |
| /** |
| * Clear the TP-SRR from the TPDU header |
| */ |
| static uint8_t sms_new_tpdu_hdr(struct bsc_nat *nat, const char *imsi, |
| const char *dest_nr, uint8_t hdr) |
| { |
| struct bsc_nat_num_rewr_entry *entry; |
| |
| /* We will find a new number now */ |
| llist_for_each_entry(entry, &nat->sms_clear_tp_srr, list) { |
| /* check the IMSI match */ |
| if (regexec(&entry->msisdn_reg, imsi, 0, NULL, 0) != 0) |
| continue; |
| if (regexec(&entry->num_reg, dest_nr, 0, NULL, 0) != 0) |
| continue; |
| |
| /* matched phone number and imsi */ |
| return hdr & ~0x20; |
| } |
| |
| return hdr; |
| } |
| |
| /** |
| * Check if we need to rewrite the number. For this SMS. |
| */ |
| static char *sms_new_dest_nr(struct bsc_nat *nat, void *ctx, |
| const char *imsi, const char *dest_nr) |
| { |
| return match_and_rewrite_number(ctx, dest_nr, imsi, |
| &nat->sms_num_rewr, NULL); |
| } |
| |
| /** |
| * This is a helper for GSM 04.11 8.2.5.2 Destination address element |
| */ |
| void sms_encode_addr_element(struct msgb *out, const char *new_number, |
| int format, int tp_data) |
| { |
| uint8_t new_addr_len; |
| uint8_t new_addr[26]; |
| |
| /* |
| * Copy the new number. We let libosmocore encode it, then set |
| * the extension followed after the length. Depending on if |
| * we want to write RP we will let the TLV code add the |
| * length for us or we need to use strlen... This is not very clear |
| * as of 03.40 and 04.11. |
| */ |
| new_addr_len = gsm48_encode_bcd_number(new_addr, ARRAY_SIZE(new_addr), |
| 1, new_number); |
| new_addr[1] = format; |
| if (tp_data) { |
| uint8_t *data = msgb_put(out, new_addr_len); |
| memcpy(data, new_addr, new_addr_len); |
| data[0] = strlen(new_number); |
| } else { |
| msgb_lv_put(out, new_addr_len - 1, new_addr + 1); |
| } |
| } |
| |
| static struct msgb *sms_create_new(uint8_t type, uint8_t ref, |
| struct gsm48_hdr *old_hdr48, |
| const uint8_t *orig_addr_ptr, |
| int orig_addr_len, const char *new_number, |
| const uint8_t *data_ptr, int data_len, |
| uint8_t tpdu_first_byte, |
| const int old_dest_len, const char *new_dest_nr) |
| { |
| struct gsm48_hdr *new_hdr48; |
| struct msgb *out; |
| |
| /* |
| * We need to re-create the patched structure. This is why we have |
| * saved the above pointers. |
| */ |
| out = msgb_alloc_headroom(4096, 128, "changed-smsc"); |
| if (!out) { |
| LOGP(DNAT, LOGL_ERROR, "Failed to allocate.\n"); |
| return NULL; |
| } |
| |
| out->l2h = out->data; |
| msgb_v_put(out, GSM411_MT_RP_DATA_MO); |
| msgb_v_put(out, ref); |
| msgb_lv_put(out, orig_addr_len, orig_addr_ptr); |
| |
| sms_encode_addr_element(out, new_number, 0x91, 0); |
| |
| |
| /* Patch the TPDU from here on */ |
| |
| /** |
| * Do we need to put a new TP-Destination-Address (TP-DA) here or |
| * can we copy the old thing? For the TP-DA we need to find out the |
| * new size. |
| */ |
| if (new_dest_nr) { |
| uint8_t *data, *new_size; |
| |
| /* reserve the size and write the header */ |
| new_size = msgb_put(out, 1); |
| out->l3h = new_size + 1; |
| msgb_v_put(out, tpdu_first_byte); |
| msgb_v_put(out, data_ptr[1]); |
| |
| /* encode the new number and put it */ |
| if (strncmp(new_dest_nr, "00", 2) == 0) |
| sms_encode_addr_element(out, new_dest_nr + 2, 0x91, 1); |
| else |
| sms_encode_addr_element(out, new_dest_nr, 0x81, 1); |
| |
| /* Copy the rest after the TP-DS */ |
| data = msgb_put(out, data_len - 2 - 1 - old_dest_len); |
| memcpy(data, &data_ptr[2 + 1 + old_dest_len], data_len - 2 - 1 - old_dest_len); |
| |
| /* fill in the new size */ |
| new_size[0] = msgb_l3len(out); |
| } else { |
| msgb_v_put(out, data_len); |
| msgb_tv_fixed_put(out, tpdu_first_byte, data_len - 1, &data_ptr[1]); |
| } |
| |
| /* prepend GSM 04.08 header */ |
| new_hdr48 = (struct gsm48_hdr *) msgb_push(out, sizeof(*new_hdr48) + 1); |
| memcpy(new_hdr48, old_hdr48, sizeof(*old_hdr48)); |
| new_hdr48->data[0] = msgb_l2len(out); |
| |
| return out; |
| } |
| |
| /** |
| * Parse the SMS and check if it needs to be rewritten |
| */ |
| static struct msgb *rewrite_sms(struct bsc_nat *nat, struct msgb *msg, |
| struct bsc_nat_parsed *parsed, const char *imsi, |
| struct gsm48_hdr *hdr48, const uint32_t len) |
| { |
| unsigned int payload_len; |
| unsigned int cp_len; |
| |
| uint8_t ref; |
| uint8_t orig_addr_len, *orig_addr_ptr; |
| uint8_t dest_addr_len, *dest_addr_ptr; |
| uint8_t data_len, *data_ptr; |
| char smsc_addr[30]; |
| |
| |
| uint8_t dest_len, orig_dest_len; |
| char _dest_nr[30]; |
| char *dest_nr; |
| char *new_dest_nr; |
| |
| char *new_number = NULL; |
| uint8_t tpdu_hdr; |
| struct msgb *out; |
| |
| payload_len = len - sizeof(*hdr48); |
| if (payload_len < 1) { |
| LOGP(DNAT, LOGL_ERROR, "SMS too short for things. %d\n", payload_len); |
| return NULL; |
| } |
| |
| cp_len = hdr48->data[0]; |
| if (payload_len + 1 < cp_len) { |
| LOGP(DNAT, LOGL_ERROR, "SMS RPDU can not fit in: %d %d\n", cp_len, payload_len); |
| return NULL; |
| } |
| |
| if (hdr48->data[1] != GSM411_MT_RP_DATA_MO) |
| return NULL; |
| |
| if (cp_len < 5) { |
| LOGP(DNAT, LOGL_ERROR, "RD-DATA can not fit in the CP len: %d\n", cp_len); |
| return NULL; |
| } |
| |
| /* RP */ |
| ref = hdr48->data[2]; |
| orig_addr_len = hdr48->data[3]; |
| orig_addr_ptr = &hdr48->data[4]; |
| |
| /* the +1 is for checking if the following element has some space */ |
| if (cp_len < 3 + orig_addr_len + 1) { |
| LOGP(DNAT, LOGL_ERROR, "RP-Originator addr does not fit: %d\n", orig_addr_len); |
| return NULL; |
| } |
| |
| dest_addr_len = hdr48->data[3 + orig_addr_len + 1]; |
| dest_addr_ptr = &hdr48->data[3 + orig_addr_len + 2]; |
| |
| if (cp_len < 3 + orig_addr_len + 1 + dest_addr_len + 1) { |
| LOGP(DNAT, LOGL_ERROR, "RP-Destination addr does not fit: %d\n", dest_addr_len); |
| return NULL; |
| } |
| gsm48_decode_bcd_number(smsc_addr, ARRAY_SIZE(smsc_addr), dest_addr_ptr - 1, 1); |
| |
| data_len = hdr48->data[3 + orig_addr_len + 1 + dest_addr_len + 1]; |
| data_ptr = &hdr48->data[3 + orig_addr_len + 1 + dest_addr_len + 2]; |
| |
| if (cp_len < 3 + orig_addr_len + 1 + dest_addr_len + 1 + data_len) { |
| LOGP(DNAT, LOGL_ERROR, "RP-Data does not fit: %d\n", data_len); |
| return NULL; |
| } |
| |
| if (data_len < 3) { |
| LOGP(DNAT, LOGL_ERROR, "SMS-SUBMIT is too short.\n"); |
| return NULL; |
| } |
| |
| /* TP-PDU starts here */ |
| if ((data_ptr[0] & 0x03) != GSM340_SMS_SUBMIT_MS2SC) |
| return NULL; |
| |
| /* |
| * look into the phone number. The length is in semi-octets, we will |
| * need to add the byte for the number type as well. |
| */ |
| orig_dest_len = data_ptr[2]; |
| dest_len = ((orig_dest_len + 1) / 2) + 1; |
| if (data_len < dest_len + 3 || dest_len < 2) { |
| LOGP(DNAT, LOGL_ERROR, "SMS-SUBMIT can not have TP-DestAddr.\n"); |
| return NULL; |
| } |
| |
| if ((data_ptr[3] & 0x80) == 0) { |
| LOGP(DNAT, LOGL_ERROR, "TP-DestAddr has extension. Not handled.\n"); |
| return NULL; |
| } |
| |
| if ((data_ptr[3] & 0x0F) == 0) { |
| LOGP(DNAT, LOGL_ERROR, "TP-DestAddr is of unknown type.\n"); |
| return NULL; |
| } |
| |
| /** |
| * Besides of what I think I read in GSM 03.40 and 04.11 the TP-DA |
| * contains the semi-octets as length (strlen), change it to the |
| * the number of bytes, but then change it back. |
| */ |
| data_ptr[2] = dest_len; |
| gsm48_decode_bcd_number(_dest_nr + 2, ARRAY_SIZE(_dest_nr) - 2, |
| &data_ptr[2], 1); |
| data_ptr[2] = orig_dest_len; |
| if ((data_ptr[3] & 0x70) == 0x10) { |
| _dest_nr[0] = _dest_nr[1] = '0'; |
| dest_nr = &_dest_nr[0]; |
| } else { |
| dest_nr = &_dest_nr[2]; |
| } |
| |
| /** |
| * Call functions to rewrite the data |
| */ |
| tpdu_hdr = sms_new_tpdu_hdr(nat, imsi, dest_nr, data_ptr[0]); |
| new_number = find_new_smsc(nat, msg, imsi, smsc_addr, dest_nr); |
| new_dest_nr = sms_new_dest_nr(nat, msg, imsi, dest_nr); |
| |
| if (tpdu_hdr == data_ptr[0] && !new_number && !new_dest_nr) |
| return NULL; |
| |
| out = sms_create_new(GSM411_MT_RP_DATA_MO, ref, hdr48, |
| orig_addr_ptr, orig_addr_len, |
| new_number ? new_number : smsc_addr, |
| data_ptr, data_len, tpdu_hdr, |
| dest_len, new_dest_nr); |
| talloc_free(new_number); |
| talloc_free(new_dest_nr); |
| return out; |
| } |
| |
| struct msgb *bsc_nat_rewrite_msg(struct bsc_nat *nat, struct msgb *msg, struct bsc_nat_parsed *parsed, const char *imsi) |
| { |
| struct gsm48_hdr *hdr48; |
| uint32_t len; |
| uint8_t msg_type, proto; |
| struct msgb *new_msg = NULL, *sccp; |
| uint8_t link_id; |
| |
| if (!imsi || strlen(imsi) < 5) |
| return msg; |
| |
| /* only care about DTAP messages */ |
| if (parsed->bssap != BSSAP_MSG_DTAP) |
| return msg; |
| if (!parsed->dest_local_ref) |
| return msg; |
| |
| hdr48 = bsc_unpack_dtap(parsed, msg, &len); |
| if (!hdr48) |
| return msg; |
| |
| link_id = msg->l3h[1]; |
| proto = gsm48_hdr_pdisc(hdr48); |
| msg_type = gsm48_hdr_msg_type(hdr48); |
| |
| if (proto == GSM48_PDISC_CC && msg_type == GSM48_MT_CC_SETUP) |
| new_msg = rewrite_setup(nat, msg, parsed, imsi, hdr48, len); |
| else if (proto == GSM48_PDISC_SMS && msg_type == GSM411_MT_CP_DATA) |
| new_msg = rewrite_sms(nat, msg, parsed, imsi, hdr48, len); |
| |
| if (!new_msg) |
| return msg; |
| |
| /* wrap with DTAP, SCCP, then IPA. TODO: Stop copying */ |
| gsm0808_prepend_dtap_header(new_msg, link_id); |
| sccp = sccp_create_dt1(parsed->dest_local_ref, new_msg->data, new_msg->len); |
| talloc_free(new_msg); |
| |
| if (!sccp) { |
| LOGP(DNAT, LOGL_ERROR, "Failed to allocate.\n"); |
| return msg; |
| } |
| |
| ipa_prepend_header(sccp, IPAC_PROTO_SCCP); |
| |
| /* the parsed hangs off from msg but it needs to survive */ |
| talloc_steal(sccp, parsed); |
| msgb_free(msg); |
| return sccp; |
| } |
| |
| static void num_rewr_free_data(struct bsc_nat_num_rewr_entry *entry) |
| { |
| regfree(&entry->msisdn_reg); |
| regfree(&entry->num_reg); |
| talloc_free(entry->replace); |
| } |
| |
| void bsc_nat_num_rewr_entry_adapt(void *ctx, struct llist_head *head, |
| const struct osmo_config_list *list) |
| { |
| struct bsc_nat_num_rewr_entry *entry, *tmp; |
| struct osmo_config_entry *cfg_entry; |
| |
| /* free the old data */ |
| llist_for_each_entry_safe(entry, tmp, head, list) { |
| num_rewr_free_data(entry); |
| llist_del(&entry->list); |
| talloc_free(entry); |
| } |
| |
| |
| if (!list) |
| return; |
| |
| llist_for_each_entry(cfg_entry, &list->entry, list) { |
| char *regexp; |
| if (cfg_entry->text[0] == '+') { |
| LOGP(DNAT, LOGL_ERROR, |
| "Plus is not allowed in the number\n"); |
| continue; |
| } |
| |
| entry = talloc_zero(ctx, struct bsc_nat_num_rewr_entry); |
| if (!entry) { |
| LOGP(DNAT, LOGL_ERROR, |
| "Allocation of the num_rewr entry failed.\n"); |
| continue; |
| } |
| |
| entry->replace = talloc_strdup(entry, cfg_entry->text); |
| if (!entry->replace) { |
| LOGP(DNAT, LOGL_ERROR, |
| "Failed to copy the replacement text.\n"); |
| talloc_free(entry); |
| continue; |
| } |
| |
| if (strcmp("prefix_lookup", entry->replace) == 0) |
| entry->is_prefix_lookup = 1; |
| |
| /* we will now build a regexp string */ |
| if (cfg_entry->mcc[0] == '^') { |
| regexp = talloc_strdup(entry, cfg_entry->mcc); |
| } else { |
| regexp = talloc_asprintf(entry, "^%s%s", |
| cfg_entry->mcc[0] == '*' ? |
| "[0-9][0-9][0-9]" : cfg_entry->mcc, |
| cfg_entry->mnc[0] == '*' ? |
| "[0-9][0-9]" : cfg_entry->mnc); |
| } |
| |
| if (!regexp) { |
| LOGP(DNAT, LOGL_ERROR, "Failed to create a regexp string.\n"); |
| talloc_free(entry); |
| continue; |
| } |
| |
| if (regcomp(&entry->msisdn_reg, regexp, 0) != 0) { |
| LOGP(DNAT, LOGL_ERROR, |
| "Failed to compile regexp '%s'\n", regexp); |
| talloc_free(regexp); |
| talloc_free(entry); |
| continue; |
| } |
| |
| talloc_free(regexp); |
| if (regcomp(&entry->num_reg, cfg_entry->option, REG_EXTENDED) != 0) { |
| LOGP(DNAT, LOGL_ERROR, |
| "Failed to compile regexp '%s'\n", cfg_entry->option); |
| regfree(&entry->msisdn_reg); |
| talloc_free(entry); |
| continue; |
| } |
| |
| /* we have copied the number */ |
| llist_add_tail(&entry->list, head); |
| } |
| } |