1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2019 Gleb Smirnoff <glebius@FreeBSD.org> 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/param.h> 29 #include <sys/ioctl.h> 30 #include <net/if.h> 31 #include <net/pfil.h> 32 33 #include <err.h> 34 #include <fcntl.h> 35 #include <stdio.h> 36 #include <stdlib.h> 37 #include <string.h> 38 #include <unistd.h> 39 40 static int dev; 41 42 static const char * const typenames[] = { 43 [PFIL_TYPE_IP4] = "IPv4", 44 [PFIL_TYPE_IP6] = "IPv6", 45 [PFIL_TYPE_ETHERNET] = "Ethernet", 46 }; 47 48 static void listheads(int argc, char *argv[]); 49 static void listhooks(int argc, char *argv[]); 50 static void hook(int argc, char *argv[]); 51 static void help(void); 52 53 static const struct cmd { 54 const char *cmd_name; 55 void (*cmd_func)(int argc, char *argv[]); 56 } cmds[] = { 57 { "heads", listheads }, 58 { "hooks", listhooks }, 59 { "link", hook }, 60 { "unlink", hook }, 61 { NULL, NULL }, 62 }; 63 64 int 65 main(int argc __unused, char *argv[] __unused) 66 { 67 int cmd = -1; 68 69 if (--argc == 0) 70 help(); 71 argv++; 72 73 for (int i = 0; cmds[i].cmd_name != NULL; i++) 74 if (!strncmp(argv[0], cmds[i].cmd_name, strlen(argv[0]))) { 75 if (cmd != -1) 76 errx(1, "ambiguous command: %s", argv[0]); 77 cmd = i; 78 } 79 if (cmd == -1) 80 errx(1, "unknown command: %s", argv[0]); 81 82 dev = open("/dev/" PFILDEV, O_RDWR); 83 if (dev == -1) 84 err(1, "open(%s)", "/dev/" PFILDEV); 85 86 (*cmds[cmd].cmd_func)(argc, argv); 87 88 return (0); 89 } 90 91 static void 92 help(void) 93 { 94 95 fprintf(stderr, "usage: %s (heads|hooks|link|unlink)\n", getprogname()); 96 exit(0); 97 } 98 99 static void 100 listheads(int argc __unused, char *argv[] __unused) 101 { 102 struct pfilioc_list plh; 103 u_int nheads, nhooks, i; 104 int j, h; 105 106 plh.pio_nheads = 0; 107 plh.pio_nhooks = 0; 108 if (ioctl(dev, PFILIOC_LISTHEADS, &plh) != 0) 109 err(1, "ioctl(PFILIOC_LISTHEADS)"); 110 111 retry: 112 plh.pio_heads = calloc(plh.pio_nheads, sizeof(struct pfilioc_head)); 113 if (plh.pio_heads == NULL) 114 err(1, "malloc"); 115 plh.pio_hooks = calloc(plh.pio_nhooks, sizeof(struct pfilioc_hook)); 116 if (plh.pio_hooks == NULL) 117 err(1, "malloc"); 118 119 nheads = plh.pio_nheads; 120 nhooks = plh.pio_nhooks; 121 122 if (ioctl(dev, PFILIOC_LISTHEADS, &plh) != 0) 123 err(1, "ioctl(PFILIOC_LISTHEADS)"); 124 125 if (plh.pio_nheads > nheads || plh.pio_nhooks > nhooks) { 126 free(plh.pio_heads); 127 free(plh.pio_hooks); 128 goto retry; 129 } 130 131 #define FMTHD "%16s %8s\n" 132 #define FMTHK "%29s %16s:%s\n" 133 printf("%16s %8s %3s %16s\n", "Intercept point", "Type", "Dir", "Hook"); 134 for (i = 0, h = 0; i < plh.pio_nheads; i++) { 135 printf(FMTHD, plh.pio_heads[i].pio_name, 136 typenames[plh.pio_heads[i].pio_type]); 137 for (j = 0; j < plh.pio_heads[i].pio_nhooksin; j++, h++) 138 printf(FMTHK, "In", plh.pio_hooks[h].pio_module, 139 plh.pio_hooks[h].pio_ruleset); 140 for (j = 0; j < plh.pio_heads[i].pio_nhooksout; j++, h++) 141 printf(FMTHK, "Out", plh.pio_hooks[h].pio_module, 142 plh.pio_hooks[h].pio_ruleset); 143 } 144 } 145 146 static void 147 listhooks(int argc __unused, char *argv[] __unused) 148 { 149 struct pfilioc_list plh; 150 u_int nhooks, i; 151 152 plh.pio_nhooks = 0; 153 if (ioctl(dev, PFILIOC_LISTHEADS, &plh) != 0) 154 err(1, "ioctl(PFILIOC_LISTHEADS)"); 155 retry: 156 plh.pio_hooks = calloc(plh.pio_nhooks, sizeof(struct pfilioc_hook)); 157 if (plh.pio_hooks == NULL) 158 err(1, "malloc"); 159 160 nhooks = plh.pio_nhooks; 161 162 if (ioctl(dev, PFILIOC_LISTHOOKS, &plh) != 0) 163 err(1, "ioctl(PFILIOC_LISTHOOKS)"); 164 165 if (plh.pio_nhooks > nhooks) { 166 free(plh.pio_hooks); 167 goto retry; 168 } 169 170 printf("%16s %16s %8s\n", "Hook", "", "Type"); 171 for (i = 0; i < plh.pio_nhooks; i++) { 172 printf("%16s:%-16s %8s\n", plh.pio_hooks[i].pio_module, 173 plh.pio_hooks[i].pio_ruleset, 174 typenames[plh.pio_hooks[i].pio_type]); 175 } 176 } 177 178 static void 179 hook(int argc, char *argv[]) 180 { 181 struct pfilioc_link req; 182 int c; 183 char *ruleset; 184 185 if (argv[0][0] == 'u') 186 req.pio_flags = PFIL_UNLINK; 187 else 188 req.pio_flags = 0; 189 190 while ((c = getopt(argc, argv, "ioa")) != -1) 191 switch (c) { 192 case 'i': 193 req.pio_flags |= PFIL_IN; 194 break; 195 case 'o': 196 req.pio_flags |= PFIL_OUT; 197 break; 198 case 'a': 199 req.pio_flags |= PFIL_APPEND; 200 break; 201 default: 202 help(); 203 } 204 205 if (!PFIL_DIR(req.pio_flags)) 206 help(); 207 208 argc -= optind; 209 argv += optind; 210 211 if (argc != 2) 212 help(); 213 214 /* link mod:ruleset head */ 215 if ((ruleset = strchr(argv[0], ':')) == NULL) 216 help(); 217 *ruleset = '\0'; 218 ruleset++; 219 220 strlcpy(req.pio_name, argv[1], sizeof(req.pio_name)); 221 strlcpy(req.pio_module, argv[0], sizeof(req.pio_module)); 222 strlcpy(req.pio_ruleset, ruleset, sizeof(req.pio_ruleset)); 223 224 if (ioctl(dev, PFILIOC_LINK, &req) != 0) 225 err(1, "ioctl(PFILIOC_LINK)"); 226 } 227