freebsd-dev/usr.bin/netstat/netgraph.c

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/*-
* Copyright (c) 1996-1999 Whistle Communications, Inc.
* All rights reserved.
*
* Subject to the following obligations and disclaimer of warranty, use and
* redistribution of this software, in source or object code forms, with or
* without modifications are expressly permitted by Whistle Communications;
* provided, however, that:
* 1. Any and all reproductions of the source or object code must include the
* copyright notice above and the following disclaimer of warranties; and
* 2. No rights are granted, in any manner or form, to use Whistle
* Communications, Inc. trademarks, including the mark "WHISTLE
* COMMUNICATIONS" on advertising, endorsements, or otherwise except as
* such appears in the above copyright notice or in the software.
*
* THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
* TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
* REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
* INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
* WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
* REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
* SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
* IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
* RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
* WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
* PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/queue.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/protosw.h>
#include <sys/linker.h>
#include <net/route.h>
#include <netgraph.h>
#include <netgraph/ng_message.h>
#include <netgraph/ng_socket.h>
#include <netgraph/ng_socketvar.h>
#include <nlist.h>
#include <errno.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <err.h>
#include "netstat.h"
static int first = 1;
static int csock = -1;
void
Restore netstat -M functionality for most statistics on core dumps. In general, when support was added to netstat for fetching data using sysctl, no provision was left for fetching equivalent data from a core dump, and in fact, netstat would _always_ fetch data from the live kernel using sysctl even when -M was specified resulting in the user believing they were getting data from coredumps when they actually weren't. Some specific changes: - Add a global 'live' variable that is true if netstat is running against the live kernel and false if -M has been specified. - Stop abusing the sysctl flag in the protocol tables to hold the protocol number. Instead, the protocol is now its own field in the tables, and it is passed as a separate parameter to the PCB and stat routines rather than overloading the KVM offset parameter. - Don't run PCB or stats functions who don't have a namelist offset if we are being run against a crash dump (!live). - For the inet and unix PCB routines, we generate the same buffer from KVM that the sysctl usually generates complete with the header and trailer. - Don't run bpf stats for !live (before it would just silently always run live). - kread() no longer trashes memory when opening the buffer if there is an error on open and the passed in buffer is smaller than _POSIX2_LINE_MAX. - The multicast routing code doesn't fallback to kvm on live kernels if the sysctl fails. Keeping this made the code rather hairy, and netstat is already tied to the kernel ABI anyway (even when using sysctl's since things like xinpcb contain an inpcb) so any kernels this is run against that have the multicast routing stuff should have the sysctls. - Don't try to dig around in the kernel linker in the netgraph PCB routine for core dumps. Other notes: - sctp's PCB routine only works on live kernels, it looked rather complicated to generate all the same stuff via KVM. Someone can always add it later if desired though. - Fix the ipsec removal bug where N_xxx for IPSEC stats weren't renumbered. - Use sysctlbyname() everywhere rather than hardcoded mib values. MFC after: 1 week Approved by: re (rwatson)
2007-07-16 17:15:55 +00:00
netgraphprotopr(u_long off, const char *name, int af1 __unused,
int proto __unused)
{
struct ngpcb *this, *next;
struct ngpcb ngpcb;
struct socket sockb;
int debug = 1;
/* If symbol not found, try looking in the KLD module */
if (off == 0) {
const char *const modname = "ng_socket.ko";
/* XXX We should get "mpath" from "sysctl kern.module_path" */
const char *mpath[] = { "/", "/boot/", "/modules/", NULL };
struct nlist sym[] = { { .n_name = "_ngsocklist" },
{ .n_name = NULL } };
const char **pre;
struct kld_file_stat ks;
int fileid;
Restore netstat -M functionality for most statistics on core dumps. In general, when support was added to netstat for fetching data using sysctl, no provision was left for fetching equivalent data from a core dump, and in fact, netstat would _always_ fetch data from the live kernel using sysctl even when -M was specified resulting in the user believing they were getting data from coredumps when they actually weren't. Some specific changes: - Add a global 'live' variable that is true if netstat is running against the live kernel and false if -M has been specified. - Stop abusing the sysctl flag in the protocol tables to hold the protocol number. Instead, the protocol is now its own field in the tables, and it is passed as a separate parameter to the PCB and stat routines rather than overloading the KVM offset parameter. - Don't run PCB or stats functions who don't have a namelist offset if we are being run against a crash dump (!live). - For the inet and unix PCB routines, we generate the same buffer from KVM that the sysctl usually generates complete with the header and trailer. - Don't run bpf stats for !live (before it would just silently always run live). - kread() no longer trashes memory when opening the buffer if there is an error on open and the passed in buffer is smaller than _POSIX2_LINE_MAX. - The multicast routing code doesn't fallback to kvm on live kernels if the sysctl fails. Keeping this made the code rather hairy, and netstat is already tied to the kernel ABI anyway (even when using sysctl's since things like xinpcb contain an inpcb) so any kernels this is run against that have the multicast routing stuff should have the sysctls. - Don't try to dig around in the kernel linker in the netgraph PCB routine for core dumps. Other notes: - sctp's PCB routine only works on live kernels, it looked rather complicated to generate all the same stuff via KVM. Someone can always add it later if desired though. - Fix the ipsec removal bug where N_xxx for IPSEC stats weren't renumbered. - Use sysctlbyname() everywhere rather than hardcoded mib values. MFC after: 1 week Approved by: re (rwatson)
2007-07-16 17:15:55 +00:00
/* Can't do this for core dumps. */
if (!live)
return;
/* See if module is loaded */
if ((fileid = kldfind(modname)) < 0) {
if (debug)
warn("kldfind(%s)", modname);
return;
}
/* Get module info */
memset(&ks, 0, sizeof(ks));
ks.version = sizeof(struct kld_file_stat);
if (kldstat(fileid, &ks) < 0) {
if (debug)
warn("kldstat(%d)", fileid);
return;
}
/* Get symbol table from module file */
for (pre = mpath; *pre; pre++) {
char path[MAXPATHLEN];
snprintf(path, sizeof(path), "%s%s", *pre, modname);
if (nlist(path, sym) == 0)
break;
}
/* Did we find it? */
if (sym[0].n_value == 0) {
if (debug)
warnx("%s not found", modname);
return;
}
/* Symbol found at load address plus symbol offset */
off = (u_long) ks.address + sym[0].n_value;
}
/* Get pointer to first socket */
kread(off, (char *)&this, sizeof(this));
/* Get my own socket node */
if (csock == -1)
NgMkSockNode(NULL, &csock, NULL);
for (; this != NULL; this = next) {
u_char rbuf[sizeof(struct ng_mesg) + sizeof(struct nodeinfo)];
struct ng_mesg *resp = (struct ng_mesg *) rbuf;
struct nodeinfo *ni = (struct nodeinfo *) resp->data;
char path[64];
/* Read in ngpcb structure */
kread((u_long)this, (char *)&ngpcb, sizeof(ngpcb));
next = LIST_NEXT(&ngpcb, socks);
/* Read in socket structure */
kread((u_long)ngpcb.ng_socket, (char *)&sockb, sizeof(sockb));
/* Check type of socket */
if (strcmp(name, "ctrl") == 0 && ngpcb.type != NG_CONTROL)
continue;
if (strcmp(name, "data") == 0 && ngpcb.type != NG_DATA)
continue;
/* Do headline */
if (first) {
printf("Netgraph sockets\n");
if (Aflag)
printf("%-8.8s ", "PCB");
printf("%-5.5s %-6.6s %-6.6s %-14.14s %s\n",
"Type", "Recv-Q", "Send-Q",
"Node Address", "#Hooks");
first = 0;
}
/* Show socket */
if (Aflag)
printf("%8lx ", (u_long) this);
printf("%-5.5s %6u %6u ",
name, sockb.so_rcv.sb_cc, sockb.so_snd.sb_cc);
/* Get info on associated node */
if (ngpcb.node_id == 0 || csock == -1)
goto finish;
snprintf(path, sizeof(path), "[%x]:", ngpcb.node_id);
if (NgSendMsg(csock, path,
NGM_GENERIC_COOKIE, NGM_NODEINFO, NULL, 0) < 0)
goto finish;
if (NgRecvMsg(csock, resp, sizeof(rbuf), NULL) < 0)
goto finish;
/* Display associated node info */
if (*ni->name != '\0')
snprintf(path, sizeof(path), "%s:", ni->name);
printf("%-14.14s %4d", path, ni->hooks);
finish:
putchar('\n');
}
}