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comparison librtpalloc/rtpmgr_resp.c @ 184:f8c40090a0a8

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librtpalloc: new library for talking to themwi-rtp-mgr
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 11 Mar 2023 23:48:14 -0800
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183:3962d9345a09 184:f8c40090a0a8
1 /*
2 * Here we implement the collect_rtpmgr_resp() function,
3 * which is a wrapper around the mess of recvmsg
4 * with file descriptor passing.
5 */
6
7 #include <sys/types.h>
8 #include <sys/socket.h>
9 #include <stdint.h>
10 #include <string.h>
11 #include <strings.h>
12 #include "../include/rtp_alloc.h"
13 #include "rtpmgr_resp.h"
14
15 collect_rtpmgr_resp(ctrl_fd, recv_flags, out)
16 struct rtp_alloc_resp_wrap *out;
17 {
18 int rc;
19 struct iovec iov;
20 struct msghdr msg;
21 union {
22 char buf[CMSG_SPACE(sizeof(int) * 4)];
23 struct cmsghdr align;
24 } cmsgu;
25 struct cmsghdr *cmsg;
26
27 iov.iov_base = &out->resp;
28 iov.iov_len = sizeof(struct rtp_alloc_resp);
29 bzero(&msg, sizeof msg);
30 msg.msg_iov = &iov;
31 msg.msg_iovlen = 1;
32 msg.msg_control = cmsgu.buf;
33 msg.msg_controllen = CMSG_SPACE(sizeof(int) * 4);
34 rc = recvmsg(ctrl_fd, &msg, recv_flags);
35 if (rc < 0)
36 return rc;
37 out->resp_len = rc;
38 for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
39 if (cmsg->cmsg_level == SOL_SOCKET &&
40 cmsg->cmsg_type == SCM_RIGHTS)
41 break;
42 }
43 if (cmsg) {
44 switch (cmsg->cmsg_len) {
45 case CMSG_LEN(sizeof(int)):
46 out->num_fd = 1;
47 break;
48 case CMSG_LEN(sizeof(int) * 2):
49 out->num_fd = 2;
50 break;
51 case CMSG_LEN(sizeof(int) * 3):
52 out->num_fd = 3;
53 break;
54 case CMSG_LEN(sizeof(int) * 4):
55 out->num_fd = 4;
56 break;
57 default:
58 out->num_fd = 0;
59 }
60 if (out->num_fd)
61 bcopy(CMSG_DATA(cmsg), out->fd_buf,
62 sizeof(int) * out->num_fd);
63 } else
64 out->num_fd = 0;
65 return 0;
66 }