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Top Forums UNIX for Advanced & Expert Users Negative values for peer inodes in ss -x output Post 303046271 by Skrynesaver on Wednesday 29th of April 2020 07:45:11 AM
Old 04-29-2020
Negative values for peer inodes in ss -x output

Hi all,

Long time no see, love what you've done with the place, been a while and asked this in the wrong forum initially...

I'm wondering how to interpret negative values for local and peer inode values for Unix sockets?

Code:
Netid  State      Recv-Q Send-Q Local Address:Port                 Peer Address:Port
...
u_str  ESTAB      0      0      /var/run/docker.sock -1847002447           * -1846996756

I can trace the local/peer relationship in the ss -xpan output for example...
grepping out known a negative inode id I get
Code:
# ss -xp | grep --  -1841560902
u_str  ESTAB      0      0      /var/run/docker.sock -1841556763           * -1841560902           users:(("dockerd",pid=29490,fd=276))
u_str  ESTAB      0      0      *                    -1841560902           * -1841556763           users:(("metricbeat",pid=5712,fd=94)

Then looking at the proc entry for the metricbeat process I get a non-negative inode for fd 94.
Code:
# ls -l /proc/5712/fd/
...
lrwx------ 1 root root 64 Apr 28 12:00 94 -> socket:[2453406394]

I'm curious as to the relationship (if any) between the "real" inode value and the negative value used for the inode in the ss output , what circumstances this value is used in (despite there being an inode for the symlink in /proc ) and general wisdom on the subject.

Thanks, Skrynesaver
 

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Negative values for peer inodes in ss -x output

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FFIND(1)						      General Commands Manual							  FFIND(1)

NAME
ffind - Finds the name of the file or directory using a given inode SYNOPSIS
ffind [-aduvV] [-f fstype] [-i imgtype] [-o imgoffset] [-b dev_sector_size] image inode DESCRIPTION
ffind finds the names of files or directories that are allocated to inode on disk image image. By default it only will only return the first name it finds. With some file systems, this will find deleted file names. ARGUMENTS
image [images] One (or more if split) disk or partition images whose format is given with '-i'. inode Integer of inode to find. The optional arguments are: -a Find all occurrences of inode. -d Find deleted entries only. -f fstype Identify the file system type of the image. Use '-f list' to list the supported file system types. If not given, autodetection methods are used. -u Find undeleted entries only. -i imgtype Identify the type of image file, such as raw or split. Use '-i list' to list the supported types. If not given, autodetection methods are used. -o imgoffset The sector offset where the file system starts in the image. -b dev_sector_size The size, in bytes, of the underlying device sectors. If not given, the value in the image format is used (if it exists) or 512-bytes is assumed. -v Verbose output to stderr. -V Display version. This program searches all directory entries looking for the given inode. This is useful when an inode has been identified from a disk unit address using ifind(1). EXAMPLE
# ffind -a image 212 SEE ALSO
ifind(1) AUTHOR
Brian Carrier <carrier at sleuthkit dot org> Send documentation updates to <doc-updates at sleuthkit dot org> FFIND(1)
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