| James Kuszmaul | 82f6c04 | 2021-01-17 11:30:16 -0800 | [diff] [blame^] | 1 | /** |
| 2 | * @file stun/rep.c STUN reply |
| 3 | * |
| 4 | * Copyright (C) 2010 Creytiv.com |
| 5 | */ |
| 6 | #include <re_types.h> |
| 7 | #include <re_mem.h> |
| 8 | #include <re_mbuf.h> |
| 9 | #include <re_sa.h> |
| 10 | #include <re_list.h> |
| 11 | #include <re_stun.h> |
| 12 | #include "stun.h" |
| 13 | |
| 14 | |
| 15 | /** |
| 16 | * Send a STUN response message |
| 17 | * |
| 18 | * @param proto Transport Protocol |
| 19 | * @param sock Socket; UDP (struct udp_sock) or TCP (struct tcp_conn) |
| 20 | * @param dst Destination network address |
| 21 | * @param presz Number of bytes in preamble, if sending over TURN |
| 22 | * @param req Matching STUN request |
| 23 | * @param key Authentication key (optional) |
| 24 | * @param keylen Number of bytes in authentication key |
| 25 | * @param fp Use STUN Fingerprint attribute |
| 26 | * @param attrc Number of attributes to encode (variable arguments) |
| 27 | * @param ... Variable list of attribute-tuples |
| 28 | * Each attribute has 2 arguments, attribute type and value |
| 29 | * |
| 30 | * @return 0 if success, otherwise errorcode |
| 31 | */ |
| 32 | int stun_reply(int proto, void *sock, const struct sa *dst, size_t presz, |
| 33 | const struct stun_msg *req, const uint8_t *key, |
| 34 | size_t keylen, bool fp, uint32_t attrc, ...) |
| 35 | { |
| 36 | struct mbuf *mb = NULL; |
| 37 | int err = ENOMEM; |
| 38 | va_list ap; |
| 39 | |
| 40 | if (!sock || !req) |
| 41 | return EINVAL; |
| 42 | |
| 43 | mb = mbuf_alloc(256); |
| 44 | if (!mb) |
| 45 | goto out; |
| 46 | |
| 47 | va_start(ap, attrc); |
| 48 | mb->pos = presz; |
| 49 | err = stun_msg_vencode(mb, stun_msg_method(req), |
| 50 | STUN_CLASS_SUCCESS_RESP, stun_msg_tid(req), |
| 51 | NULL, key, keylen, fp, 0x00, attrc, ap); |
| 52 | va_end(ap); |
| 53 | if (err) |
| 54 | goto out; |
| 55 | |
| 56 | mb->pos = presz; |
| 57 | err = stun_send(proto, sock, dst, mb); |
| 58 | |
| 59 | out: |
| 60 | mem_deref(mb); |
| 61 | |
| 62 | return err; |
| 63 | } |
| 64 | |
| 65 | |
| 66 | /** |
| 67 | * Send a STUN error response |
| 68 | * |
| 69 | * @param proto Transport Protocol |
| 70 | * @param sock Socket; UDP (struct udp_sock) or TCP (struct tcp_conn) |
| 71 | * @param dst Destination network address |
| 72 | * @param presz Number of bytes in preamble, if sending over TURN |
| 73 | * @param req Matching STUN request |
| 74 | * @param scode Status code |
| 75 | * @param reason Reason string |
| 76 | * @param key Authentication key (optional) |
| 77 | * @param keylen Number of bytes in authentication key |
| 78 | * @param fp Use STUN Fingerprint attribute |
| 79 | * @param attrc Number of attributes to encode (variable arguments) |
| 80 | * @param ... Variable list of attribute-tuples |
| 81 | * Each attribute has 2 arguments, attribute type and value |
| 82 | * |
| 83 | * @return 0 if success, otherwise errorcode |
| 84 | */ |
| 85 | int stun_ereply(int proto, void *sock, const struct sa *dst, size_t presz, |
| 86 | const struct stun_msg *req, uint16_t scode, |
| 87 | const char *reason, const uint8_t *key, size_t keylen, |
| 88 | bool fp, uint32_t attrc, ...) |
| 89 | { |
| 90 | struct stun_errcode ec; |
| 91 | struct mbuf *mb = NULL; |
| 92 | int err = ENOMEM; |
| 93 | va_list ap; |
| 94 | |
| 95 | if (!sock || !req || !scode || !reason) |
| 96 | return EINVAL; |
| 97 | |
| 98 | mb = mbuf_alloc(256); |
| 99 | if (!mb) |
| 100 | goto out; |
| 101 | |
| 102 | ec.code = scode; |
| 103 | ec.reason = (char *)reason; |
| 104 | |
| 105 | va_start(ap, attrc); |
| 106 | mb->pos = presz; |
| 107 | err = stun_msg_vencode(mb, stun_msg_method(req), STUN_CLASS_ERROR_RESP, |
| 108 | stun_msg_tid(req), &ec, key, keylen, |
| 109 | fp, 0x00, attrc, ap); |
| 110 | va_end(ap); |
| 111 | if (err) |
| 112 | goto out; |
| 113 | |
| 114 | mb->pos = presz; |
| 115 | err = stun_send(proto, sock, dst, mb); |
| 116 | |
| 117 | out: |
| 118 | mem_deref(mb); |
| 119 | |
| 120 | return err; |
| 121 | } |