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A C library for asynchronous DNS requests (grpc依赖)
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c-ares/docs/ares_process.3

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Avoid buffer overflow in RC4 loop comparison (#336) The rc4 function iterates over a buffer of size buffer_len who's maximum value is INT_MAX with a counter of type short that is not guaranteed to have maximum size INT_MAX. In circumstances where short is narrower than int and where buffer_len is larger than the maximum value of a short, it may be possible to loop infinitely as counter will overflow and never be greater than or equal to buffer_len. The solution is to make the comparison be between types of equal width. This commit defines counter as an int. Fix By: Fionn Fitzmaurice (@fionn)
4 years ago
.\"
.\" Copyright 1998 by the Massachusetts Institute of Technology.
provide SPDX identifiers and a REUSE CI job to verify All files have their licence and copyright information clearly identifiable. If not in the file header, they are set separately in .reuse/dep5. All used license texts are provided in LICENSES/
2 years ago
.\" SPDX-License-Identifier: MIT
.\"
Avoid buffer overflow in RC4 loop comparison (#336) The rc4 function iterates over a buffer of size buffer_len who's maximum value is INT_MAX with a counter of type short that is not guaranteed to have maximum size INT_MAX. In circumstances where short is narrower than int and where buffer_len is larger than the maximum value of a short, it may be possible to loop infinitely as counter will overflow and never be greater than or equal to buffer_len. The solution is to make the comparison be between types of equal width. This commit defines counter as an int. Fix By: Fionn Fitzmaurice (@fionn)
4 years ago
.TH ARES_PROCESS 3 "25 July 1998"
.SH NAME
docs: mark ares_process() as deprecated We don't want people using ares_process() anymore due to issues/limitations in select(). Lets also remove the example and reword the manpage. Authored-By: Brad House (@bradh352)
3 months ago
ares_process_fd, ares_process \- Process events for name resolution
Avoid buffer overflow in RC4 loop comparison (#336) The rc4 function iterates over a buffer of size buffer_len who's maximum value is INT_MAX with a counter of type short that is not guaranteed to have maximum size INT_MAX. In circumstances where short is narrower than int and where buffer_len is larger than the maximum value of a short, it may be possible to loop infinitely as counter will overflow and never be greater than or equal to buffer_len. The solution is to make the comparison be between types of equal width. This commit defines counter as an int. Fix By: Fionn Fitzmaurice (@fionn)
4 years ago
.SH SYNOPSIS
.nf
#include <ares.h>
docs: mark ares_process() as deprecated We don't want people using ares_process() anymore due to issues/limitations in select(). Lets also remove the example and reword the manpage. Authored-By: Brad House (@bradh352)
3 months ago
void ares_process_fd(ares_channel_t *\fIchannel\fP,
ares_socket_t \fIread_fd\fP,
ares_socket_t \fIwrite_fd\fP)
`ares_channel` -> `ares_channel_t *`: don't bury the pointer (#595) `ares_channel` is defined as `typedef struct ares_channeldata *ares_channel;`. The problem with this, is it embeds the pointer into the typedef, which means an `ares_channel` can never be declared as `const` as if you write `const ares_channel channel`, that expands to `struct ares_channeldata * const ares_channel` and not `const struct ares_channeldata *channel`. We will now typedef `ares_channel_t` as `typedef struct ares_channeldata ares_channel_t;`, so if you write `const ares_channel_t *channel`, it properly expands to `const struct ares_channeldata *channel`. We are maintaining the old typedef for API compatibility with existing integrations, and due to typedef expansion this should not even cause any compiler warnings for existing code. There are no ABI implications with this change. I could be convinced to keep existing public functions as `ares_channel` if a sufficient argument exists, but internally we really need make this change for modern best practices. This change will allow us to internally use `const ares_channel_t *` where appropriate. Whether or not we decide to change any public interfaces to use `const` may require further discussion on if there might be ABI implications (I don't think so, but I'm also not 100% sure what a compiler internally does with `const` when emitting machine code ... I think more likely ABI implications would occur going the opposite direction). FYI, This PR was done via a combination of sed and clang-format, the only manual code change was the addition of the new typedef, and a couple doc fixes :) Fix By: Brad House (@bradh352)
1 year ago
void ares_process(ares_channel_t *\fIchannel\fP,
Avoid buffer overflow in RC4 loop comparison (#336) The rc4 function iterates over a buffer of size buffer_len who's maximum value is INT_MAX with a counter of type short that is not guaranteed to have maximum size INT_MAX. In circumstances where short is narrower than int and where buffer_len is larger than the maximum value of a short, it may be possible to loop infinitely as counter will overflow and never be greater than or equal to buffer_len. The solution is to make the comparison be between types of equal width. This commit defines counter as an int. Fix By: Fionn Fitzmaurice (@fionn)
4 years ago
fd_set *\fIread_fds\fP,
fd_set *\fIwrite_fds\fP)
.fi
.SH DESCRIPTION
docs: mark ares_process() as deprecated We don't want people using ares_process() anymore due to issues/limitations in select(). Lets also remove the example and reword the manpage. Authored-By: Brad House (@bradh352)
3 months ago
The \fBares_process_fd(3)\fP function handles input/output events and timeouts
Avoid buffer overflow in RC4 loop comparison (#336) The rc4 function iterates over a buffer of size buffer_len who's maximum value is INT_MAX with a counter of type short that is not guaranteed to have maximum size INT_MAX. In circumstances where short is narrower than int and where buffer_len is larger than the maximum value of a short, it may be possible to loop infinitely as counter will overflow and never be greater than or equal to buffer_len. The solution is to make the comparison be between types of equal width. This commit defines counter as an int. Fix By: Fionn Fitzmaurice (@fionn)
4 years ago
associated with queries pending on the name service channel identified by
docs: mark ares_process() as deprecated We don't want people using ares_process() anymore due to issues/limitations in select(). Lets also remove the example and reword the manpage. Authored-By: Brad House (@bradh352)
3 months ago
\fIchannel\fP. The file descriptor passed in \fIread_fd\fP and \fIwrite_fd\fP
indicate if the file descriptor has been notified of a read event or write
event, respectively. If a notification has not occurred, use
\fIARES_SOCKET_BAD\fP.
Avoid buffer overflow in RC4 loop comparison (#336) The rc4 function iterates over a buffer of size buffer_len who's maximum value is INT_MAX with a counter of type short that is not guaranteed to have maximum size INT_MAX. In circumstances where short is narrower than int and where buffer_len is larger than the maximum value of a short, it may be possible to loop infinitely as counter will overflow and never be greater than or equal to buffer_len. The solution is to make the comparison be between types of equal width. This commit defines counter as an int. Fix By: Fionn Fitzmaurice (@fionn)
4 years ago
docs: mark ares_process() as deprecated We don't want people using ares_process() anymore due to issues/limitations in select(). Lets also remove the example and reword the manpage. Authored-By: Brad House (@bradh352)
3 months ago
This function is typically used with the \fIARES_OPT_SOCK_STATE_CB\fP option.
Avoid buffer overflow in RC4 loop comparison (#336) The rc4 function iterates over a buffer of size buffer_len who's maximum value is INT_MAX with a counter of type short that is not guaranteed to have maximum size INT_MAX. In circumstances where short is narrower than int and where buffer_len is larger than the maximum value of a short, it may be possible to loop infinitely as counter will overflow and never be greater than or equal to buffer_len. The solution is to make the comparison be between types of equal width. This commit defines counter as an int. Fix By: Fionn Fitzmaurice (@fionn)
4 years ago
docs: mark ares_process() as deprecated We don't want people using ares_process() anymore due to issues/limitations in select(). Lets also remove the example and reword the manpage. Authored-By: Brad House (@bradh352)
3 months ago
\fBares_timeout(3)\fP should be used to retrieve the desired timeout, and when
the timeout expires, the integrator must call \fBares_process_fd(3)\fP with
both sockets set to \fIARES_SOCKET_BAD\fP. There is no need to do this if
events are also delivered for any file descriptors as timeout processing
will automatically be handled by any call to \fBares_process_fd(3)\fP.
Avoid buffer overflow in RC4 loop comparison (#336) The rc4 function iterates over a buffer of size buffer_len who's maximum value is INT_MAX with a counter of type short that is not guaranteed to have maximum size INT_MAX. In circumstances where short is narrower than int and where buffer_len is larger than the maximum value of a short, it may be possible to loop infinitely as counter will overflow and never be greater than or equal to buffer_len. The solution is to make the comparison be between types of equal width. This commit defines counter as an int. Fix By: Fionn Fitzmaurice (@fionn)
4 years ago
docs: mark ares_process() as deprecated We don't want people using ares_process() anymore due to issues/limitations in select(). Lets also remove the example and reword the manpage. Authored-By: Brad House (@bradh352)
3 months ago
The \fBares_process(3)\fP function works in the same manner, except it works
on \fIfd_sets\fP as is used by \fBselect(3)\fP and retrieved by
\fBares_fds(3)\fP. This method is deprecated and should not be used in modern
applications due to known limitations to the \fBselect(3)\fP implementation.
Avoid buffer overflow in RC4 loop comparison (#336) The rc4 function iterates over a buffer of size buffer_len who's maximum value is INT_MAX with a counter of type short that is not guaranteed to have maximum size INT_MAX. In circumstances where short is narrower than int and where buffer_len is larger than the maximum value of a short, it may be possible to loop infinitely as counter will overflow and never be greater than or equal to buffer_len. The solution is to make the comparison be between types of equal width. This commit defines counter as an int. Fix By: Fionn Fitzmaurice (@fionn)
4 years ago
.SH SEE ALSO
.BR ares_fds (3),
docs: mark ares_process() as deprecated We don't want people using ares_process() anymore due to issues/limitations in select(). Lets also remove the example and reword the manpage. Authored-By: Brad House (@bradh352)
3 months ago
.BR ares_timeout (3),
.BR ares_init_options (3)
with \fIARES_OPT_EVENT_THREAD\fP or \fIARES_OPT_SOCK_STATE_CB\fP