From c57844b08bced71778f38f2346464c3e0836287c Mon Sep 17 00:00:00 2001
From: Mattias Andrée <maandree@kth.se>
Date: Fri, 1 Nov 2019 22:06:40 +0100
Subject: Add some functions and add functions with _failed suffix
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Signed-off-by: Mattias Andrée <maandree@kth.se>
---
 recv.c | 124 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 124 insertions(+)
 create mode 100644 recv.c

(limited to 'recv.c')

diff --git a/recv.c b/recv.c
new file mode 100644
index 0000000..03985ba
--- /dev/null
+++ b/recv.c
@@ -0,0 +1,124 @@
+/* See LICENSE file for copyright and license details. */
+#include "internal.h"
+
+
+void
+liberror_recv_failed(int fd, void *buf, size_t n, int flags, const char *fname)
+{
+	const char *desc;
+	int saved_errno, val;
+	struct timeval tv;
+	switch (errno) {
+#if defined(EAGAIN)
+	case EAGAIN:
+#endif
+#if defined(EWOULDBLOCK) && (!defined(EAGAIN) || EAGAIN != EWOULDBLOCK)
+	case EWOULDBLOCK:
+#endif
+#if defined(EAGAIN) || defined(EWOULDBLOCK)
+		saved_errno = errno;
+		if (flags & MSG_OOB) {
+			desc = "Attempting to receive in nonblocking mode but the operation would block, "
+			       "attempting to receive with time out and the operation timed out "
+			       "or the socket does not support blocking to await out-of-band data";
+			if (flags & MSG_DONTWAIT) {
+			msg_oob_nonblocking:
+				desc = "Attempting to receive in nonblocking mode but the operation would block or"
+				       " the socket does not support blocking to await out-of-band data";
+			} else if ((val = fcntl(fd, F_GETFL)) < 0) {
+				/* Do nothing */
+			} else if (val & O_NONBLOCK) {
+				goto msg_oob_nonblocking;
+			} else if (getsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &tv, &(socklen_t){(socklen_t)sizeof(tv)}) ||
+			           tv.tv_sec || tv.tv_usec) {
+				desc = "Attempting to receive with time out and the operation timed out or"
+				       " the socket does not support blocking to await out-of-band data";
+			} else {
+				desc = "The socket does not support blocking to await out-of-band data";
+			}
+		} else {
+			desc = "Attempting to receive in nonblocking mode but the operation would block "
+			       "or attempting to receive with time out and the operation timed out";
+			if (flags & MSG_DONTWAIT) {
+			no_msg_oob_nonblocking:
+				desc = "Attempting to receive in nonblocking mode but the operation would block";
+			} else if ((val = fcntl(fd, F_GETFL)) < 0) {
+				/* Do nothing */
+			} else if (val & O_NONBLOCK) {
+				goto no_msg_oob_nonblocking;
+			} else if (!getsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &tv, &(socklen_t){(socklen_t)sizeof(tv)}) &&
+			           !tv.tv_sec && !tv.tv_usec) {
+				desc = "Attempting to receive with time out and the operation timed out";
+			}
+		}
+		errno = saved_errno;
+		break;
+#endif
+	case EBADF:
+		if (fd < 0)
+			desc = "Negative file descriptor number specified";
+		else
+			desc = "Unassigned file descriptor number specified";
+		break;
+	case ECONNREFUSED:
+		desc = "The remote host refused to allow the network connection";
+		break;
+	case ECONNRESET:
+		desc = "The connection was forcibly closed by a peer";
+		break;
+	case EFAULT:
+		desc = "Invalid user space address specified in the second argument";
+		break;
+	case EINTR:
+		desc = "System call was interrupted by a signal or machine suspension";
+		break;
+	case EINVAL:
+		if (fd < 0)
+			desc = "Negative file descriptor number specified";
+		else if ((flags & ~(MSG_PEEK | MSG_WAITALL)) == MSG_OOB)
+			desc = "No out-of-band data is available";
+		else if (flags & MSG_OOB)
+			desc = "No out-of-band data is available or non-existing flag is specified";
+		else
+			desc = "Non-existing flag is specified";
+		break;
+	case EIO:
+		desc = "An I/O error occurred while reading from or writing to the file system";
+		break;
+	case ENOBUFS:
+		desc = "Insufficient resource available in the system to perform the operation";
+		break;
+	case ENOMEM:
+		desc = "Out of memory";
+		break;
+	case ENOTCONN:
+		desc = "The socket is not connected";
+		break;
+	case ENOTSOCK:
+		desc = "The file descriptor refer to a non-socket file";
+		break;
+	case EOPNOTSUPP:
+		desc = "A flag that is not supported for the socket protocol is specified";
+		break;
+	case ETIMEDOUT:
+		desc = "The connection timed out during connection establishment, "
+		       "or due to a transmission timeout on active connection";
+		break;
+	default:
+		desc = "";
+		break;
+	}
+	liberror_libc_set_error_one_file(desc, "recv", "Socket file", fd, fname);
+}
+
+
+ssize_t
+liberror_recv(int fd, void *buf, size_t n, int flags, const char *fname)
+{
+	ssize_t r = recv(fd, buf, n, flags);
+	if (r >= 0)
+		return r;
+	liberror_save_backtrace(NULL);
+	liberror_recv_failed(fd, buf, n, flags, fname);
+	return -1;
+}
-- 
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