mirror of
https://github.com/jart/cosmopolitan.git
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105 lines
4.7 KiB
C
105 lines
4.7 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/cp.internal.h"
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#include "libc/calls/internal.h"
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#include "libc/calls/struct/iovec.h"
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#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"
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#include "libc/intrin/strace.internal.h"
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#include "libc/nt/winsock.h"
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#include "libc/sock/internal.h"
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#include "libc/sock/sock.h"
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#include "libc/sock/struct/sockaddr.h"
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#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"
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/**
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* Receives data from network.
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*
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* This function blocks unless MSG_DONTWAIT is passed. In that case, the
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* non-error EWOULDBLOCK might be returned. It basically means we didn't
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* wait around to learn an amount of bytes were written that we know in
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* advance are guaranteed to be atomic.
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*
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* @param fd is the file descriptor returned by socket()
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* @param buf is where received network data gets copied
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* @param size is the byte capacity of buf
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* @param flags can have `MSG_OOB`, `MSG_PEEK`, and `MSG_DONTWAIT`
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* @param opt_out_srcaddr receives the binary ip:port of the data's origin
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* @param opt_inout_srcaddrsize is srcaddr capacity which gets updated
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* @return number of bytes received, 0 on remote close, or -1 w/ errno
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* @error EINTR, EHOSTUNREACH, ECONNRESET (UDP ICMP Port Unreachable),
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* EPIPE (if MSG_NOSIGNAL), EMSGSIZE, ENOTSOCK, EFAULT, etc.
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* @cancelationpoint
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* @asyncsignalsafe
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* @restartable (unless SO_RCVTIMEO)
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*/
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ssize_t recvfrom(int fd, void *buf, size_t size, int flags,
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struct sockaddr *opt_out_srcaddr,
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uint32_t *opt_inout_srcaddrsize) {
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ssize_t rc;
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struct sockaddr_storage addr = {0};
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uint32_t addrsize = sizeof(addr);
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BEGIN_CANCELATION_POINT;
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if (IsAsan() && !__asan_is_valid(buf, size)) {
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rc = efault();
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} else if (fd < g_fds.n && g_fds.p[fd].kind == kFdZip) {
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rc = enotsock();
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} else if (!IsWindows()) {
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rc = sys_recvfrom(fd, buf, size, flags, &addr, &addrsize);
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} else if (__isfdopen(fd)) {
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if (__isfdkind(fd, kFdSocket)) {
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rc = sys_recvfrom_nt(fd, (struct iovec[]){{buf, size}}, 1, flags, &addr,
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&addrsize);
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if (rc != -1 && addrsize == sizeof(addr)) {
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addrsize = 0;
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}
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} else if (__isfdkind(fd, kFdFile) && !opt_out_srcaddr) { /* socketpair */
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if (!flags) {
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rc = sys_read_nt(fd, (struct iovec[]){{buf, size}}, 1, -1);
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} else {
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rc = einval();
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}
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} else {
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rc = enotsock();
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}
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} else {
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rc = ebadf();
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}
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if (rc != -1) {
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if (addrsize) {
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if (IsBsd()) {
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__convert_bsd_to_sockaddr(&addr);
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}
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__write_sockaddr(&addr, opt_out_srcaddr, opt_inout_srcaddrsize);
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} else {
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*opt_inout_srcaddrsize = 0;
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}
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}
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END_CANCELATION_POINT;
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DATATRACE("recvfrom(%d, [%#.*hhs%s], %'zu, %#x) → %'ld% lm", fd,
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MAX(0, MIN(40, rc)), buf, rc > 40 ? "..." : "", size, flags, rc);
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return rc;
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}
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