xref: /freebsd/usr.bin/netstat/netgraph.c (revision 74bf4e164ba5851606a27d4feff27717452583e5)
1 /*
2  * Copyright (c) 1996-1999 Whistle Communications, Inc.
3  * All rights reserved.
4  *
5  * Subject to the following obligations and disclaimer of warranty, use and
6  * redistribution of this software, in source or object code forms, with or
7  * without modifications are expressly permitted by Whistle Communications;
8  * provided, however, that:
9  * 1. Any and all reproductions of the source or object code must include the
10  *    copyright notice above and the following disclaimer of warranties; and
11  * 2. No rights are granted, in any manner or form, to use Whistle
12  *    Communications, Inc. trademarks, including the mark "WHISTLE
13  *    COMMUNICATIONS" on advertising, endorsements, or otherwise except as
14  *    such appears in the above copyright notice or in the software.
15  *
16  * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
17  * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
18  * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
19  * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
21  * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
22  * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
23  * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
24  * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
25  * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
26  * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
27  * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
28  * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
29  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
31  * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
32  * OF SUCH DAMAGE.
33  */
34 
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
37 
38 #include <sys/param.h>
39 #include <sys/queue.h>
40 #include <sys/socket.h>
41 #include <sys/socketvar.h>
42 #include <sys/protosw.h>
43 #include <sys/linker.h>
44 
45 #include <net/route.h>
46 
47 #include <netgraph.h>
48 #include <netgraph/ng_message.h>
49 #include <netgraph/ng_socket.h>
50 #include <netgraph/ng_socketvar.h>
51 
52 #include <nlist.h>
53 #include <errno.h>
54 #include <stdio.h>
55 #include <string.h>
56 #include <unistd.h>
57 #include <err.h>
58 #include "netstat.h"
59 
60 static	int first = 1;
61 static	int csock = -1;
62 
63 void
64 netgraphprotopr(u_long off, const char *name, int af1 __unused)
65 {
66 	struct ngpcb *this, *next;
67 	struct ngpcb ngpcb;
68 	struct ngsock info;
69 	struct socket sockb;
70 	int debug = 1;
71 
72 	/* If symbol not found, try looking in the KLD module */
73 	if (off == 0) {
74 		const char *const modname = "ng_socket.ko";
75 /* XXX We should get "mpath" from "sysctl kern.module_path" */
76 		const char *mpath[] = { "/", "/boot/", "/modules/", NULL };
77 		struct nlist sym[] = { { "_ngsocklist" }, { NULL } };
78 		const char **pre;
79 		struct kld_file_stat ks;
80 		int fileid;
81 
82 		/* See if module is loaded */
83 		if ((fileid = kldfind(modname)) < 0) {
84 			if (debug)
85 				warn("kldfind(%s)", modname);
86 			return;
87 		}
88 
89 		/* Get module info */
90 		memset(&ks, 0, sizeof(ks));
91 		ks.version = sizeof(struct kld_file_stat);
92 		if (kldstat(fileid, &ks) < 0) {
93 			if (debug)
94 				warn("kldstat(%d)", fileid);
95 			return;
96 		}
97 
98 		/* Get symbol table from module file */
99 		for (pre = mpath; *pre; pre++) {
100 			char path[MAXPATHLEN];
101 
102 			snprintf(path, sizeof(path), "%s%s", *pre, modname);
103 			if (nlist(path, sym) == 0)
104 				break;
105 		}
106 
107 		/* Did we find it? */
108 		if (sym[0].n_value == 0) {
109 			if (debug)
110 				warnx("%s not found", modname);
111 			return;
112 		}
113 
114 		/* Symbol found at load address plus symbol offset */
115 		off = (u_long) ks.address + sym[0].n_value;
116 	}
117 
118 	/* Get pointer to first socket */
119 	kread(off, (char *)&this, sizeof(this));
120 
121 	/* Get my own socket node */
122 	if (csock == -1)
123 		NgMkSockNode(NULL, &csock, NULL);
124 
125 	for (; this != NULL; this = next) {
126 		u_char rbuf[sizeof(struct ng_mesg) + sizeof(struct nodeinfo)];
127 		struct ng_mesg *resp = (struct ng_mesg *) rbuf;
128 		struct nodeinfo *ni = (struct nodeinfo *) resp->data;
129 		char path[64];
130 
131 		/* Read in ngpcb structure */
132 		kread((u_long)this, (char *)&ngpcb, sizeof(ngpcb));
133 		next = LIST_NEXT(&ngpcb, socks);
134 
135 		/* Read in socket structure */
136 		kread((u_long)ngpcb.ng_socket, (char *)&sockb, sizeof(sockb));
137 
138 		/* Check type of socket */
139 		if (strcmp(name, "ctrl") == 0 && ngpcb.type != NG_CONTROL)
140 			continue;
141 		if (strcmp(name, "data") == 0 && ngpcb.type != NG_DATA)
142 			continue;
143 
144 		/* Do headline */
145 		if (first) {
146 			printf("Netgraph sockets\n");
147 			if (Aflag)
148 				printf("%-8.8s ", "PCB");
149 			printf("%-5.5s %-6.6s %-6.6s %-14.14s %s\n",
150 			    "Type", "Recv-Q", "Send-Q",
151 			    "Node Address", "#Hooks");
152 			first = 0;
153 		}
154 
155 		/* Show socket */
156 		if (Aflag)
157 			printf("%8lx ", (u_long) this);
158 		printf("%-5.5s %6u %6u ",
159 		    name, sockb.so_rcv.sb_cc, sockb.so_snd.sb_cc);
160 
161 		/* Get ngsock structure */
162 		if (ngpcb.sockdata == 0)	/* unconnected data socket */
163 			goto finish;
164 		kread((u_long)ngpcb.sockdata, (char *)&info, sizeof(info));
165 
166 		/* Get info on associated node */
167 		if (info.node == 0 || csock == -1)
168 			goto finish;
169 		snprintf(path, sizeof(path), "[%lx]:", (u_long) info.node);
170 		if (NgSendMsg(csock, path,
171 		    NGM_GENERIC_COOKIE, NGM_NODEINFO, NULL, 0) < 0)
172 			goto finish;
173 		if (NgRecvMsg(csock, resp, sizeof(rbuf), NULL) < 0)
174 			goto finish;
175 
176 		/* Display associated node info */
177 		if (*ni->name != '\0')
178 			snprintf(path, sizeof(path), "%s:", ni->name);
179 		printf("%-14.14s %4d", path, ni->hooks);
180 finish:
181 		putchar('\n');
182 	}
183 }
184 
185