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/* ISC license. */
#include <skalibs/sysdeps.h>
#include <skalibs/nonposix.h>
#include <errno.h>
#include <sys/socket.h>
#include <sys/uio.h>
#include <skalibs/posixishard.h>
#include <skalibs/uint16.h>
#include <skalibs/uint32.h>
#include <skalibs/cbuffer.h>
#include <skalibs/djbunix.h>
#include <skalibs/allreadwrite.h>
#include <skalibs/stralloc.h>
#include <skalibs/unixmessage.h>
union aligner_u
{
struct cmsghdr cmsghdr ;
int i ;
} ;
static int const awesomeflags =
#ifdef SKALIBS_HASMSGDONTWAIT
MSG_DONTWAIT
#else
0
#endif
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#ifdef SKALIBS_HASCMSGCLOEXEC
MSG_CMSG_CLOEXEC
#else
0
#endif
;
static int unixmessage_receiver_fill (unixmessage_receiver_t *b)
{
union aligner_u ancilbuf[1 + CMSG_SPACE(b->auxb.a - 1) / sizeof(union aligner_u)] ;
struct iovec iov[2] ;
struct msghdr msghdr =
{
.msg_name = 0,
.msg_namelen = 0,
.msg_iov = iov,
.msg_iovlen = 2,
.msg_flags = 0,
.msg_control = b->fds_ok & 1 ? ancilbuf : 0,
.msg_controllen = b->fds_ok & 1 ? CMSG_SPACE(b->auxb.a - 1) : 0
} ;
ssize_t r = -1 ;
if (cbuffer_isfull(&b->mainb) || ((b->fds_ok & 1) && cbuffer_isfull(&b->auxb)))
return (errno = ENOBUFS, -1) ;
cbuffer_wpeek(&b->mainb, iov) ;
while (r < 0)
{
r = recvmsg(b->fd, &msghdr, awesomeflags) ;
if (!r || (r < 0 && errno != EINTR)) return r ;
}
if (b->fds_ok & 1)
{
struct cmsghdr *c = CMSG_FIRSTHDR(&msghdr) ;
if (c)
{
size_t auxlen ;
if (c->cmsg_level != SOL_SOCKET
|| c->cmsg_type != SCM_RIGHTS) return (errno = EPROTO, -1) ;
auxlen = (size_t)(c->cmsg_len - (CMSG_DATA(c) - (unsigned char *)c)) ;
if (auxlen && !(b->fds_ok & 2))
{
size_t i = auxlen / sizeof(int) ;
while (i--) fd_close(((int *)CMSG_DATA(c))[i]) ;
return (errno = EPROTO, -1) ;
}
#ifndef SKALIBS_HASCMSGCLOEXEC
{
size_t i = 0 ;
for (; i < auxlen / sizeof(int) ; i++)
if (coe(((int *)CMSG_DATA(c))[i]) < 0)
{
i++ ;
while (i--) fd_close(((int *)CMSG_DATA(c))[i]) ;
return -1 ;
}
}
#endif
if ((msghdr.msg_flags & MSG_CTRUNC) || cbuffer_put(&b->auxb, (char *)CMSG_DATA(c), auxlen) < auxlen)
{
size_t i = auxlen/sizeof(int) ;
while (i--) fd_close(((int *)CMSG_DATA(c))[i]) ;
return (errno = ENOBUFS, -1) ;
}
}
}
cbuffer_WSEEK(&b->mainb, r) ;
return 1 ;
}
int unixmessage_receive (unixmessage_receiver_t *b, unixmessage_t *m)
{
if (b->maindata.len == b->mainlen && b->auxdata.len == b->auxlen)
{
char pack[6] ;
if (cbuffer_len(&b->mainb) < 6)
{
ssize_t r = sanitize_read(unixmessage_receiver_fill(b)) ;
if (r <= 0) return r ;
if (cbuffer_len(&b->mainb) < 6) return (errno = EWOULDBLOCK, 0) ;
}
cbuffer_get(&b->mainb, pack, 6) ;
uint32_unpack_big(pack, &b->mainlen) ;
if (b->fds_ok & 1) uint16_unpack_big(pack + 4, &b->auxlen) ;
else b->auxlen = 0 ;
b->auxlen *= sizeof(int) ;
if (b->mainlen > UNIXMESSAGE_MAXSIZE
|| b->auxlen > ((b->fds_ok & 2) ? UNIXMESSAGE_MAXFDS * sizeof(int) : 0))
return (errno = EPROTO, -1) ;
if (!stralloc_ready(&b->maindata, b->mainlen)
|| !stralloc_ready(&b->auxdata, b->auxlen))
return -1 ;
b->maindata.len = 0 ;
b->auxdata.len = 0 ;
}
for (;;)
{
ssize_t r ;
size_t n = cbuffer_len(&b->mainb) ;
if (n > b->mainlen - b->maindata.len) n = b->mainlen - b->maindata.len ;
b->maindata.len += cbuffer_get(&b->mainb, b->maindata.s + b->maindata.len, n) ;
n = cbuffer_len(&b->auxb) ;
if (n > b->auxlen - b->auxdata.len) n = b->auxlen - b->auxdata.len ;
b->auxdata.len += cbuffer_get(&b->auxb, b->auxdata.s + b->auxdata.len, n) ;
if (b->maindata.len == b->mainlen && b->auxdata.len == b->auxlen) break ;
r = sanitize_read(unixmessage_receiver_fill(b)) ;
if (r <= 0) return r ;
}
m->s = b->maindata.s ;
m->len = b->maindata.len ;
m->fds = (int *)b->auxdata.s ;
m->nfds = b->auxdata.len / sizeof(int) ;
return 1 ;
}
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