FreeCalypso > hg > themwi-system-sw
comparison rtp-mgr/ctrl_prot.c @ 179:b79d6334f543
themwi-rtp-mgr: RTP port allocation split out of themwi-mgw
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sat, 11 Mar 2023 20:19:14 -0800 |
parents | mgw/ctrl_prot.c@f062c32a5116 |
children | 565477d07418 |
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178:b259e2722485 | 179:b79d6334f543 |
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1 /* | |
2 * In this module we implement our control socket protocol. | |
3 */ | |
4 | |
5 #include <sys/types.h> | |
6 #include <sys/socket.h> | |
7 #include <sys/uio.h> | |
8 #include <netinet/in.h> | |
9 #include <stdio.h> | |
10 #include <stdint.h> | |
11 #include <stdlib.h> | |
12 #include <string.h> | |
13 #include <strings.h> | |
14 #include <syslog.h> | |
15 #include <unistd.h> | |
16 #include "../include/tmgw_const.h" | |
17 #include "../include/rtp_alloc.h" | |
18 #include "struct.h" | |
19 #include "select.h" | |
20 | |
21 extern struct bind_range_cfg bind_range_gsm, bind_range_pstn; | |
22 | |
23 void | |
24 free_rtp_end(roe) | |
25 struct rtp_one_end *roe; | |
26 { | |
27 close(roe->rtp_fd); | |
28 close(roe->rtcp_fd); | |
29 } | |
30 | |
31 void | |
32 ctrl_message_handler(fd) | |
33 { | |
34 struct rtp_alloc_req req; | |
35 struct rtp_alloc_resp resp; | |
36 struct rtp_one_end rtp_gsm, rtp_pstn; | |
37 struct iovec iov; | |
38 struct msghdr msg; | |
39 int fd_out[4], num_fd, *fd_bufptr; | |
40 union { | |
41 char buf[CMSG_SPACE(sizeof fd_out)]; | |
42 struct cmsghdr align; | |
43 } cmsgu; | |
44 struct cmsghdr *cmsg; | |
45 int rc; | |
46 | |
47 /* receive request */ | |
48 rc = recv(fd, &req, sizeof req, 0); | |
49 if (rc < sizeof req) { | |
50 syslog(LOG_DEBUG, "ctrl connection closing"); | |
51 close(fd); | |
52 FD_CLR(fd, &select_for_read); | |
53 return; | |
54 } | |
55 /* start preparing response */ | |
56 bzero(&resp, sizeof resp); | |
57 resp.transact_ref = req.transact_ref; | |
58 switch (req.ep_type) { | |
59 case TMGW_EP_TYPE_DUMMY_GSM: | |
60 case TMGW_EP_TYPE_DUMMY_PSTN: | |
61 case TMGW_EP_TYPE_GATEWAY: | |
62 break; | |
63 default: | |
64 resp.res = RTP_ALLOC_ERR_PARAM; | |
65 error_resp: send(fd, &resp, sizeof resp, 0); | |
66 return; | |
67 } | |
68 /* allocate resources */ | |
69 if (req.ep_type & TMGW_EP_HAS_GSM_SOCK) { | |
70 rc = get_rtp_port_pair(&rtp_gsm, &bind_range_gsm); | |
71 if (rc < 0) { | |
72 syslog(LOG_ERR, | |
73 "unable to get local port pair on GSM side"); | |
74 resp.res = RTP_ALLOC_ERR_RSRC; | |
75 goto error_resp; | |
76 } | |
77 } | |
78 if (req.ep_type & TMGW_EP_HAS_PSTN_SOCK) { | |
79 rc = get_rtp_port_pair(&rtp_pstn, &bind_range_pstn); | |
80 if (rc < 0) { | |
81 syslog(LOG_ERR, | |
82 "unable to get local port pair on PSTN side"); | |
83 if (req.ep_type & TMGW_EP_HAS_GSM_SOCK) | |
84 free_rtp_end(&rtp_gsm); | |
85 resp.res = RTP_ALLOC_ERR_RSRC; | |
86 goto error_resp; | |
87 } | |
88 } | |
89 /* finish ordinary body of response */ | |
90 resp.res = RTP_ALLOC_OK; | |
91 if (req.ep_type & TMGW_EP_HAS_GSM_SOCK) | |
92 bcopy(&rtp_gsm.bound_addr, &resp.gsm_addr, | |
93 sizeof(struct sockaddr_in)); | |
94 if (req.ep_type & TMGW_EP_HAS_PSTN_SOCK) | |
95 bcopy(&rtp_pstn.bound_addr, &resp.pstn_addr, | |
96 sizeof(struct sockaddr_in)); | |
97 iov.iov_base = &resp; | |
98 iov.iov_len = sizeof resp; | |
99 /* file descriptor passing voodoo */ | |
100 switch (req.ep_type) { | |
101 case TMGW_EP_TYPE_DUMMY_GSM: | |
102 num_fd = 2; | |
103 fd_out[0] = rtp_gsm.rtp_fd; | |
104 fd_out[1] = rtp_gsm.rtcp_fd; | |
105 break; | |
106 case TMGW_EP_TYPE_DUMMY_PSTN: | |
107 num_fd = 2; | |
108 fd_out[0] = rtp_pstn.rtp_fd; | |
109 fd_out[1] = rtp_pstn.rtcp_fd; | |
110 break; | |
111 case TMGW_EP_TYPE_GATEWAY: | |
112 num_fd = 4; | |
113 fd_out[0] = rtp_gsm.rtp_fd; | |
114 fd_out[1] = rtp_gsm.rtcp_fd; | |
115 fd_out[2] = rtp_pstn.rtp_fd; | |
116 fd_out[3] = rtp_pstn.rtcp_fd; | |
117 } | |
118 bzero(&msg, sizeof msg); | |
119 msg.msg_iov = &iov; | |
120 msg.msg_iovlen = 1; | |
121 msg.msg_control = cmsgu.buf; | |
122 msg.msg_controllen = CMSG_SPACE(sizeof(int) * num_fd); | |
123 cmsg = CMSG_FIRSTHDR(&msg); | |
124 cmsg->cmsg_level = SOL_SOCKET; | |
125 cmsg->cmsg_type = SCM_RIGHTS; | |
126 cmsg->cmsg_len = CMSG_LEN(sizeof(int) * num_fd); | |
127 fd_bufptr = (int *) CMSG_DATA(cmsg); | |
128 bcopy(fd_out, fd_bufptr, sizeof(int) * num_fd); | |
129 sendmsg(fd, &msg, 0); | |
130 } |