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/*
** k_linux.c - Linux 0.99.13q or later kernel access functions
**
** Copyright (c) 1997-1998 Peter Eriksson <pen@lysator.liu.se>
**
** This program is free software; you can redistribute it and/or
** modify it as you wish - as long as you don't claim that you wrote
** it.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*/
#include "config.h"
#include <stdio.h>
#include <syslog.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "pidentd.h"
/*
** Make sure we are running on a supported OS version
*/
int
ka_init(void)
{
return 0; /* We always succeed */
}
int
ka_open(void **misc)
{
FILE *fp;
while ((fp = fopen("/proc/net/tcp", "r")) == NULL && errno == EINTR)
;
if (fp == NULL)
{
syslog(LOG_ERR, "fopen(\"/proc/net/tcp\", \"r\"): %m");
return -1;
}
*misc = (void *) fp;
return 0;
}
int
ka_lookup(void *vp, struct kernel *kp)
{
FILE *fp;
long dummy;
char buf[512];
long r_laddr, r_raddr, myladdr, myraddr;
int r_lport, r_rport, mylport, myrport;
int euid;
int nra;
/*
* PSz 11 Dec 02
*
* We have observed Debian identd (on a fairly busy dual-CPU machine)
* sometimes reporting 'root' for connections belonging to "real" users.
* File /proc/net/tcp is written mostly in routine get__sock in
* /usr/src/kernel-source-2.2.19/net/ipv4/proc.c :
*
* sprintf(tmpbuf, "%4d: %08lX:%04X %08lX:%04X"
* " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu",
* i, src, srcp, dest, destp, sp->state,
* (tw_bucket ?
* 0 :
* (format == 0) ?
* tp->write_seq-tp->snd_una : atomic_read(&sp->wmem_alloc)),
* (tw_bucket ?
* 0 :
* (format == 0) ?
* tp->rcv_nxt-tp->copied_seq: atomic_read(&sp->rmem_alloc)),
* timer_active, timer_expires-jiffies,
* (tw_bucket ? 0 : tp->retransmits),
* (!tw_bucket && sp->socket) ? sp->socket->inode->i_uid : 0,
* (!tw_bucket && timer_active) ? sp->timeout : 0,
* (!tw_bucket && sp->socket) ? sp->socket->inode->i_ino : 0);
*
* Should we skip lines with just ino, or both uid and ino, zero?
*/
unsigned long int ino;
r_rport = ntohs(kp->remote.sin_port);
r_lport = ntohs(kp->local.sin_port);
r_raddr = kp->remote.sin_addr.s_addr;
r_laddr = kp->local.sin_addr.s_addr;
fp = (FILE *) vp;
kp->ruid = NO_UID;
rewind(fp);
/* eat header */
if (fgets(buf, sizeof(buf)-1,fp) == NULL)
return -1;
while (fgets(buf, sizeof(buf)-1, fp) != NULL)
{
nra = sscanf(buf, "%d: %lX:%x %lX:%x %x %lX:%lX %x:%lX %lx %d %ld %lu",
&dummy, &myladdr, &mylport, &myraddr, &myrport,
&dummy, &dummy, &dummy, &dummy, &dummy, &dummy,
&euid, &dummy, &ino);
if (nra >= 12)
{
if (myladdr == r_laddr && mylport == r_lport &&
myraddr == r_raddr && myrport == r_rport)
{
if (nra >= 14 && euid == 0 && ino == 0) {
/*
* Both uid and ino are zero: not even a socket?
* Skip (continue), probably fail; or fail (break)
* straight away? Hopefully we retry later.
*/
continue;
}
kp->euid = euid;
return 1;
}
}
}
return -1;
}
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