b12141f9b4
This code is still fragile, it should not deadlock even if there is too much to read, but this at least hacks around the problem. To avoid huge stacks, allocate the buffer on the heap. Fixes wireshark hang with about 50 interfaces... Signed-off-by: Ben Greear <greearb@candelatech.com>
103 lines
3.6 KiB
C
103 lines
3.6 KiB
C
/* sync_pipe.h
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* Low-level synchronization pipe routines for use by Wireshark/TShark
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* and dumpcap
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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/** @file
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*
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* Low-level sync pipe interfaces.
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*/
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#ifndef __SYNC_PIPE_H__
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#define __SYNC_PIPE_H__
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#include <ws_posix_compat.h>
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/*
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* Maximum length of sync pipe message data. Must be < 2^24, as the
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* message length is 3 bytes.
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* XXX - this must be large enough to handle a Really Big Filter
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* Expression, as the error message for an incorrect filter expression
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* is a bit larger than the filter expression, and large enough to
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* handle a large interface list.
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* 4096 is a typical PIPE_BUF size for atomic writes, but we should have
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* only one writer and one reader so that shouldn't be an issue.
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*/
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#define SP_MAX_MSG_LEN (512 * 1000)
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/*
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* Indications sent out on the sync pipe (from child to parent).
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* We might want to switch to something like Thrift
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* (http://thrift.apache.org/) or Protocol Buffers
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* (http://code.google.com/p/protobuf-c/) if we ever need to use more
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* complex messages.
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*/
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#define SP_EXEC_FAILED 'X' /* errno value for the exec failing */
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#define SP_FILE 'F' /* the name of the recently opened file */
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#define SP_ERROR_MSG 'E' /* error message */
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#define SP_LOG_MSG 'L' /* log message */
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#define SP_BAD_FILTER 'B' /* error message for bad capture filter */
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#define SP_PACKET_COUNT 'P' /* count of packets captured since last message */
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#define SP_DROPS 'D' /* count of packets dropped in capture */
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#define SP_SUCCESS 'S' /* success indication, no extra data */
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#define SP_TOOLBAR_CTRL 'T' /* interface toolbar control packet */
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#define SP_IFACE_LIST 'I' /* interface list */
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/*
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* Win32 only: Indications sent out on the signal pipe (from parent to child)
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* (UNIX-like sends signals for this)
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*/
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#define SP_QUIT 'Q' /* "gracefully" capture quit message (SIGUSR1) */
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/* Write a message, with a string body, to the recipient pipe in the
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standard format (1-byte message indicator, 3-byte message length
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(excluding length and indicator field), and the string.
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If msg is NULL, the message has only a length and indicator. */
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extern void
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sync_pipe_write_string_msg(int pipe_fd, char indicator, const char *msg);
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/* Write a message, with an unsigned integer body, to the recipient
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pipe in the standard format (1-byte message indicator, 3-byte
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message length (excluding length and indicator field), and the
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unsigned integer, as a string. */
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extern void
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sync_pipe_write_uint_msg(int pipe_fd, char indicator, unsigned int num);
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/* Write a message, with an integer body, to the recipient pipe in the
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standard format (1-byte message indicator, 3-byte message length
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(excluding length and indicator field), and the integer, as a string. */
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extern void
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sync_pipe_write_int_msg(int pipe_fd, char indicator, int num);
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/** the child encountered an error, notify the parent */
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extern void
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sync_pipe_write_errmsgs_to_parent(int pipe_fd, const char *error_msg,
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const char *secondary_error_msg);
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/** Has the parent signalled the child to stop? */
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#define SIGNAL_PIPE_CTRL_ID_NONE "none"
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#ifdef _WIN32
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#define SIGNAL_PIPE_FORMAT "\\\\.\\pipe\\wireshark.%s.signal"
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#endif
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#endif /* sync_pipe.h */
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/*
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* Editor modelines - https://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 4
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* vi: set shiftwidth=4 tabstop=8 expandtab:
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* :indentSize=4:tabSize=8:noTabs=true:
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*/
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