FreeCalypso > hg > themwi-rtp-mgr

comparison rtp-mgr/ctrl_prot.c @ 2:247f4bbde24c

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rtp-mgr: daemon ported over
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 27 May 2024 19:42:19 +0000
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1:560a3765ab30 2:247f4bbde24c
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 <themwi/rtp/rtp_alloc_if.h>
17 #include "struct.h"
18 #include "select.h"
19
20 extern struct bind_range_cfg bind_range_gsm, bind_range_pstn;
21
22 static void
23 free_rtp_end(roe)
24 struct rtp_one_end *roe;
25 {
26 close(roe->rtp_fd);
27 close(roe->rtcp_fd);
28 }
29
30 static void
31 close_fds(fd_list, num_fd)
32 int *fd_list, num_fd;
33 {
34 int i;
35
36 for (i = 0; i < num_fd; i++)
37 close(fd_list[i]);
38 }
39
40 void
41 ctrl_message_handler(fd)
42 {
43 struct rtp_alloc_req req;
44 struct rtp_alloc_resp resp;
45 struct rtp_one_end rtp_gsm, rtp_pstn;
46 struct iovec iov;
47 struct msghdr msg;
48 int fd_out[4], num_fd, *fd_bufptr;
49 union {
50 char buf[CMSG_SPACE(sizeof fd_out)];
51 struct cmsghdr align;
52 } cmsgu;
53 struct cmsghdr *cmsg;
54 int rc;
55
56 /* receive request */
57 rc = recv(fd, &req, sizeof req, 0);
58 if (rc < sizeof req) {
59 syslog(LOG_DEBUG, "ctrl connection closing");
60 close(fd);
61 FD_CLR(fd, &select_for_read);
62 return;
63 }
64 /* start preparing response */
65 bzero(&resp, sizeof resp);
66 resp.transact_ref = req.transact_ref;
67 switch (req.ep_type) {
68 case RTP_ALLOC_TYPE_GSM:
69 case RTP_ALLOC_TYPE_PSTN:
70 case RTP_ALLOC_TYPE_GSM2PSTN:
71 case RTP_ALLOC_TYPE_GSM2GSM:
72 break;
73 default:
74 resp.res = RTP_ALLOC_ERR_PARAM;
75 error_resp: send(fd, &resp, sizeof resp, 0);
76 return;
77 }
78 /* allocate resources */
79 if (req.ep_type & RTP_ALLOC_DO_GSM1) {
80 rc = get_rtp_port_pair(&rtp_gsm, &bind_range_gsm);
81 if (rc < 0) {
82 syslog(LOG_ERR,
83 "unable to get local port pair on GSM side");
84 resp.res = RTP_ALLOC_ERR_RSRC;
85 goto error_resp;
86 }
87 }
88 if (req.ep_type & RTP_ALLOC_DO_PSTN) {
89 rc = get_rtp_port_pair(&rtp_pstn, &bind_range_pstn);
90 if (rc < 0) {
91 syslog(LOG_ERR,
92 "unable to get local port pair on PSTN side");
93 if (req.ep_type & RTP_ALLOC_DO_GSM1)
94 free_rtp_end(&rtp_gsm);
95 resp.res = RTP_ALLOC_ERR_RSRC;
96 goto error_resp;
97 }
98 }
99 if (req.ep_type & RTP_ALLOC_DO_GSM2) {
100 rc = get_rtp_port_pair(&rtp_pstn, &bind_range_gsm);
101 if (rc < 0) {
102 syslog(LOG_ERR,
103 "unable to get 2nd local port pair on GSM side");
104 free_rtp_end(&rtp_gsm);
105 resp.res = RTP_ALLOC_ERR_RSRC;
106 goto error_resp;
107 }
108 }
109 /* finish ordinary body of response */
110 resp.res = RTP_ALLOC_OK;
111 if (req.ep_type & RTP_ALLOC_DO_GSM1)
112 bcopy(&rtp_gsm.bound_addr, &resp.gsm_addr,
113 sizeof(struct sockaddr_in));
114 if (req.ep_type & (RTP_ALLOC_DO_PSTN | RTP_ALLOC_DO_GSM2))
115 bcopy(&rtp_pstn.bound_addr, &resp.pstn_addr,
116 sizeof(struct sockaddr_in));
117 iov.iov_base = &resp;
118 iov.iov_len = sizeof resp;
119 /* file descriptor passing voodoo */
120 switch (req.ep_type) {
121 case RTP_ALLOC_TYPE_GSM:
122 num_fd = 2;
123 fd_out[0] = rtp_gsm.rtp_fd;
124 fd_out[1] = rtp_gsm.rtcp_fd;
125 break;
126 case RTP_ALLOC_TYPE_PSTN:
127 num_fd = 2;
128 fd_out[0] = rtp_pstn.rtp_fd;
129 fd_out[1] = rtp_pstn.rtcp_fd;
130 break;
131 case RTP_ALLOC_TYPE_GSM2PSTN:
132 case RTP_ALLOC_TYPE_GSM2GSM:
133 num_fd = 4;
134 fd_out[0] = rtp_gsm.rtp_fd;
135 fd_out[1] = rtp_gsm.rtcp_fd;
136 fd_out[2] = rtp_pstn.rtp_fd;
137 fd_out[3] = rtp_pstn.rtcp_fd;
138 }
139 bzero(&msg, sizeof msg);
140 msg.msg_iov = &iov;
141 msg.msg_iovlen = 1;
142 msg.msg_control = cmsgu.buf;
143 msg.msg_controllen = CMSG_SPACE(sizeof(int) * num_fd);
144 cmsg = CMSG_FIRSTHDR(&msg);
145 cmsg->cmsg_level = SOL_SOCKET;
146 cmsg->cmsg_type = SCM_RIGHTS;
147 cmsg->cmsg_len = CMSG_LEN(sizeof(int) * num_fd);
148 fd_bufptr = (int *) CMSG_DATA(cmsg);
149 bcopy(fd_out, fd_bufptr, sizeof(int) * num_fd);
150 sendmsg(fd, &msg, 0);
151 close_fds(fd_out, num_fd);
152 }