cosmopolitan/libc/sock/recvfrom.c

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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi
Copyright 2020 Justine Alexandra Roberts Tunney
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Permission to use, copy, modify, and/or distribute this software for
any purpose with or without fee is hereby granted, provided that the
above copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
PERFORMANCE OF THIS SOFTWARE.
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*/
#include "libc/calls/cp.internal.h"
#include "libc/calls/internal.h"
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#include "libc/calls/struct/iovec.h"
#include "libc/calls/struct/iovec.internal.h"
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#include "libc/dce.h"
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#include "libc/intrin/asan.internal.h"
#include "libc/intrin/strace.internal.h"
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#include "libc/nt/winsock.h"
#include "libc/sock/internal.h"
#include "libc/sock/sock.h"
#include "libc/sock/struct/sockaddr.h"
#include "libc/sock/struct/sockaddr.internal.h"
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#include "libc/sock/syscall_fd.internal.h"
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#include "libc/sysv/errfuns.h"
/**
* Receives data from network.
*
* @param fd is the file descriptor returned by socket()
* @param buf is where received network data gets copied
* @param size is the byte capacity of buf
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* @param flags is a bitmask which may contain any of the following:
* - `MSG_DONTWAIT` to force `O_NONBLOCK` behavior for this call
* - `MSG_OOB` is broadly supported (untested by cosmo)
* - `MSG_PEEK` is broadly supported (untested by cosmo)
* - `MSG_WAITALL` is broadly supported (untested by cosmo)
* - `MSG_DONTROUTE` is broadly supported (untested by cosmo)
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* @param opt_out_srcaddr receives the binary ip:port of the data's origin
* @param opt_inout_srcaddrsize is srcaddr capacity which gets updated
* @return number of bytes received, 0 on remote close, or -1 w/ errno
* @error EINTR, EHOSTUNREACH, ECONNRESET (UDP ICMP Port Unreachable),
* EPIPE (if MSG_NOSIGNAL), EMSGSIZE, ENOTSOCK, EFAULT, etc.
* @cancellationpoint
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* @asyncsignalsafe
* @restartable (unless SO_RCVTIMEO)
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*/
ssize_t recvfrom(int fd, void *buf, size_t size, int flags,
struct sockaddr *opt_out_srcaddr,
uint32_t *opt_inout_srcaddrsize) {
ssize_t rc;
struct sockaddr_storage addr = {0};
uint32_t addrsize = sizeof(addr);
BEGIN_CANCELLATION_POINT;
if (IsAsan() && !__asan_is_valid(buf, size)) {
rc = efault();
} else if (fd < g_fds.n && g_fds.p[fd].kind == kFdZip) {
rc = enotsock();
} else if (!IsWindows()) {
rc = sys_recvfrom(fd, buf, size, flags, &addr, &addrsize);
} else if (__isfdopen(fd)) {
if (__isfdkind(fd, kFdSocket)) {
rc = sys_recvfrom_nt(&g_fds.p[fd], (struct iovec[]){{buf, size}}, 1,
flags, &addr, &addrsize);
} else if (__isfdkind(fd, kFdFile) && !opt_out_srcaddr) { /* socketpair */
if (!flags) {
rc = sys_read_nt(&g_fds.p[fd], (struct iovec[]){{buf, size}}, 1, -1);
} else {
rc = einval();
}
} else {
rc = enotsock();
}
} else {
rc = ebadf();
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}
if (rc != -1) {
if (IsBsd()) {
__convert_bsd_to_sockaddr(&addr);
}
__write_sockaddr(&addr, opt_out_srcaddr, opt_inout_srcaddrsize);
}
END_CANCELLATION_POINT;
DATATRACE("recvfrom(%d, [%#.*hhs%s], %'zu, %#x) → %'ld% lm", fd,
MAX(0, MIN(40, rc)), buf, rc > 40 ? "..." : "", size, flags, rc);
return rc;
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}