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lib: Support fd passing using the 4.3BSD way

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This is required on Solaris

BUG: https://bugzilla.samba.org/show_bug.cgi?id=11053

Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Michael Adam <obnox@samba.org>
This commit is contained in:
Volker Lendecke 2015-09-27 00:54:42 +02:00 committed by Michael Adam
parent f4e06a9bce
commit 0499cee903
1 changed files with 80 additions and 0 deletions
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80
source3/lib/msghdr.c
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@ -21,6 +21,8 @@
#include "lib/util/iov_buf.h"
#include <sys/socket.h>
#if defined(HAVE_STRUCT_MSGHDR_MSG_CONTROL)
ssize_t msghdr_prep_fds(struct msghdr *msg, uint8_t *buf, size_t bufsize,
const int *fds, size_t num_fds)
{
@ -106,6 +108,84 @@ size_t msghdr_extract_fds(struct msghdr *msg, int *fds, size_t fds_size)
return num_fds;
}
#elif defined(HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS)
ssize_t msghdr_prep_fds(struct msghdr *msg, uint8_t *buf, size_t bufsize,
const int *fds, size_t num_fds)
{
size_t needed;
if (num_fds > INT8_MAX) {
return -1;
}
needed = sizeof(int) * num_fds;
if ((msg == NULL) || (needed > bufsize)) {
return needed;
}
memcpy(buf, fds, needed);
msg->msg_accrights = (caddr_t) buf;
msg->msg_accrightslen = needed;
return needed;
}
size_t msghdr_prep_recv_fds(struct msghdr *msg, uint8_t *buf, size_t bufsize,
size_t num_fds)
{
size_t ret = num_fds * sizeof(int);
if (bufsize < ret) {
return ret;
}
if (msg != NULL) {
if (num_fds != 0) {
msg->msg_accrights = (caddr_t) buf;
msg->msg_accrightslen = ret;
} else {
msg->msg_accrights = NULL;
msg->msg_accrightslen = 0;
}
}
return ret;
}
size_t msghdr_extract_fds(struct msghdr *msg, int *fds, size_t fds_size)
{
size_t num_fds = msg->msg_accrightslen / sizeof(int);
if ((fds != 0) && (num_fds <= fds_size)) {
memcpy(fds, msg->msg_accrights, msg->msg_accrightslen);
}
return num_fds;
}
#else
ssize_t msghdr_prep_fds(struct msghdr *msg, uint8_t *buf, size_t bufsize,
const int *fds, size_t num_fds)
{
return -1;
}
size_t msghdr_prep_recv_fds(struct msghdr *msg, uint8_t *buf, size_t bufsize,
size_t num_fds)
{
return 0;
}
size_t msghdr_extract_fds(struct msghdr *msg, int *fds, size_t fds_size)
{
return 0;
}
#endif
struct msghdr_buf {
struct msghdr msg;
struct sockaddr_storage addr;