Harald Welte | e0590df | 2009-02-15 03:34:15 +0000 | [diff] [blame] | 1 | #include <stdio.h> |
Harald Welte | 91b5b0d | 2009-02-06 12:51:39 +0000 | [diff] [blame] | 2 | #include <openbsc/tlv.h> |
| 3 | |
Harald Welte | e0590df | 2009-02-15 03:34:15 +0000 | [diff] [blame] | 4 | int tlv_dump(struct tlv_parsed *dec) |
| 5 | { |
| 6 | int i; |
| 7 | |
| 8 | for (i = 0; i <= 0xff; i++) { |
| 9 | if (!dec->lv[i].val) |
| 10 | continue; |
| 11 | printf("T=%02x L=%d\n", i, dec->lv[i].len); |
| 12 | } |
| 13 | return 0; |
| 14 | } |
| 15 | |
Harald Welte | 7bc4cbc | 2009-02-21 12:59:22 +0000 | [diff] [blame] | 16 | int tlv_parse(struct tlv_parsed *dec, const struct tlv_definition *def, |
| 17 | const u_int8_t *buf, int buf_len) |
Harald Welte | 91b5b0d | 2009-02-06 12:51:39 +0000 | [diff] [blame] | 18 | { |
Harald Welte | 2fa7934 | 2009-02-14 19:07:10 +0000 | [diff] [blame] | 19 | u_int8_t tag, len = 1; |
Harald Welte | 7bc4cbc | 2009-02-21 12:59:22 +0000 | [diff] [blame] | 20 | const u_int8_t *pos; |
Harald Welte | 2fa7934 | 2009-02-14 19:07:10 +0000 | [diff] [blame] | 21 | int num_parsed = 0; |
Harald Welte | 91b5b0d | 2009-02-06 12:51:39 +0000 | [diff] [blame] | 22 | |
Harald Welte | 2fa7934 | 2009-02-14 19:07:10 +0000 | [diff] [blame] | 23 | memset(dec, 0, sizeof(*dec)); |
Harald Welte | 91b5b0d | 2009-02-06 12:51:39 +0000 | [diff] [blame] | 24 | |
Harald Welte | 2fa7934 | 2009-02-14 19:07:10 +0000 | [diff] [blame] | 25 | for (pos = buf; pos < buf+buf_len; pos += len) { |
| 26 | tag = *pos; |
| 27 | /* FIXME: use tables for knwon IEI */ |
Harald Welte | e0590df | 2009-02-15 03:34:15 +0000 | [diff] [blame] | 28 | switch (def->def[tag].type) { |
| 29 | case TLV_TYPE_T: |
Harald Welte | 2fa7934 | 2009-02-14 19:07:10 +0000 | [diff] [blame] | 30 | /* GSM TS 04.07 11.2.4: Type 1 TV or Type 2 T */ |
| 31 | dec->lv[tag].val = pos; |
| 32 | dec->lv[tag].len = 0; |
| 33 | len = 1; |
| 34 | num_parsed++; |
Harald Welte | e0590df | 2009-02-15 03:34:15 +0000 | [diff] [blame] | 35 | break; |
| 36 | case TLV_TYPE_TV: |
| 37 | dec->lv[tag].val = pos+1; |
| 38 | dec->lv[tag].len = 1; |
| 39 | len = 2; |
| 40 | num_parsed++; |
| 41 | break; |
| 42 | case TLV_TYPE_FIXED: |
| 43 | dec->lv[tag].val = pos+1; |
| 44 | dec->lv[tag].len = def->def[tag].fixed_len; |
| 45 | len = def->def[tag].fixed_len + 1; |
| 46 | num_parsed++; |
| 47 | break; |
| 48 | case TLV_TYPE_TLV: |
Harald Welte | 2fa7934 | 2009-02-14 19:07:10 +0000 | [diff] [blame] | 49 | /* GSM TS 04.07 11.2.4: Type 4 TLV */ |
| 50 | if (pos + 1 > buf + buf_len) |
| 51 | return -1; |
| 52 | dec->lv[tag].val = pos+2; |
| 53 | dec->lv[tag].len = *(pos+1); |
| 54 | len = dec->lv[tag].len + 2; |
| 55 | if (pos + len > buf + buf_len) |
| 56 | return -2; |
| 57 | num_parsed++; |
Harald Welte | e0590df | 2009-02-15 03:34:15 +0000 | [diff] [blame] | 58 | break; |
| 59 | case TLV_TYPE_TL16V: |
| 60 | if (pos + 2 > buf + buf_len) |
| 61 | return -1; |
| 62 | dec->lv[tag].val = pos+3; |
| 63 | dec->lv[tag].len = *(pos+1) << 8 | *(pos+2); |
| 64 | len = dec->lv[tag].len + 3; |
| 65 | if (pos + len > buf + buf_len) |
| 66 | return -2; |
| 67 | num_parsed++; |
| 68 | break; |
Harald Welte | 2fa7934 | 2009-02-14 19:07:10 +0000 | [diff] [blame] | 69 | } |
Harald Welte | 91b5b0d | 2009-02-06 12:51:39 +0000 | [diff] [blame] | 70 | } |
Harald Welte | e0590df | 2009-02-15 03:34:15 +0000 | [diff] [blame] | 71 | //tlv_dump(dec); |
Harald Welte | 2fa7934 | 2009-02-14 19:07:10 +0000 | [diff] [blame] | 72 | return num_parsed; |
Harald Welte | 91b5b0d | 2009-02-06 12:51:39 +0000 | [diff] [blame] | 73 | } |
Harald Welte | e0590df | 2009-02-15 03:34:15 +0000 | [diff] [blame] | 74 | |