1 #include <sys/socket.h>
2 #include <limits.h>
3 #include <time.h>
4 #include <sys/time.h>
5 #include <string.h>
6 #include <errno.h>
7 #include "syscall.h"
8
9 hidden void __convert_scm_timestamps(struct msghdr *, socklen_t);
10
__convert_scm_timestamps(struct msghdr * msg,socklen_t csize)11 void __convert_scm_timestamps(struct msghdr *msg, socklen_t csize)
12 {
13 if (SCM_TIMESTAMP == SCM_TIMESTAMP_OLD) return;
14 if (!msg->msg_control || !msg->msg_controllen) return;
15
16 struct cmsghdr *cmsg, *last=0;
17 long tmp;
18 long long tvts[2];
19 int type = 0;
20
21 for (cmsg=CMSG_FIRSTHDR(msg); cmsg; cmsg=CMSG_NXTHDR(msg, cmsg)) {
22 if (cmsg->cmsg_level==SOL_SOCKET) switch (cmsg->cmsg_type) {
23 case SCM_TIMESTAMP_OLD:
24 if (type) break;
25 type = SCM_TIMESTAMP;
26 goto common;
27 case SCM_TIMESTAMPNS_OLD:
28 type = SCM_TIMESTAMPNS;
29 common:
30 memcpy(&tmp, CMSG_DATA(cmsg), sizeof tmp);
31 tvts[0] = tmp;
32 memcpy(&tmp, CMSG_DATA(cmsg) + sizeof tmp, sizeof tmp);
33 tvts[1] = tmp;
34 break;
35 }
36 last = cmsg;
37 }
38 if (!last || !type) return;
39 if (CMSG_SPACE(sizeof tvts) > csize-msg->msg_controllen) {
40 msg->msg_flags |= MSG_CTRUNC;
41 return;
42 }
43 msg->msg_controllen += CMSG_SPACE(sizeof tvts);
44 cmsg = CMSG_NXTHDR(msg, last);
45 cmsg->cmsg_level = SOL_SOCKET;
46 cmsg->cmsg_type = type;
47 cmsg->cmsg_len = CMSG_LEN(sizeof tvts);
48 memcpy(CMSG_DATA(cmsg), &tvts, sizeof tvts);
49 }
50
recvmsg(int fd,struct msghdr * msg,int flags)51 ssize_t recvmsg(int fd, struct msghdr *msg, int flags)
52 {
53 ssize_t r;
54 if (!msg) {
55 errno = EFAULT;
56 return -1;
57 }
58 socklen_t orig_controllen = msg->msg_controllen;
59 #if LONG_MAX > INT_MAX
60 struct msghdr h, *orig = msg;
61 if (msg) {
62 h = *msg;
63 h.__pad1 = h.__pad2 = 0;
64 msg = &h;
65 }
66 #endif
67 r = socketcall_cp(recvmsg, fd, msg, flags, 0, 0, 0);
68 if (r >= 0) __convert_scm_timestamps(msg, orig_controllen);
69 #if LONG_MAX > INT_MAX
70 if (orig) *orig = h;
71 #endif
72 return r;
73 }
74