1 /* 2 * sock.c 3 * 4 * Copyright (c) 1996-1999 Whistle Communications, Inc. 5 * All rights reserved. 6 * 7 * Subject to the following obligations and disclaimer of warranty, use and 8 * redistribution of this software, in source or object code forms, with or 9 * without modifications are expressly permitted by Whistle Communications; 10 * provided, however, that: 11 * 1. Any and all reproductions of the source or object code must include the 12 * copyright notice above and the following disclaimer of warranties; and 13 * 2. No rights are granted, in any manner or form, to use Whistle 14 * Communications, Inc. trademarks, including the mark "WHISTLE 15 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 16 * such appears in the above copyright notice or in the software. 17 * 18 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 19 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 20 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 21 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 22 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 23 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 24 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 25 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 26 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 27 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 28 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 29 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 30 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 31 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 32 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 33 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 34 * OF SUCH DAMAGE. 35 * 36 * Author: Archie Cobbs <archie@whistle.com> 37 * 38 * $Whistle: sock.c,v 1.12 1999/01/20 00:57:23 archie Exp $ 39 */ 40 41 #include <sys/cdefs.h> 42 __FBSDID("$FreeBSD$"); 43 44 #include <sys/types.h> 45 #include <sys/socket.h> 46 #include <stdarg.h> 47 #include <netgraph/ng_message.h> 48 #include <netgraph/ng_socket.h> 49 50 #include "netgraph.h" 51 #include "internal.h" 52 53 /* The socket node type KLD */ 54 #define NG_SOCKET_KLD "ng_socket.ko" 55 56 /* 57 * Create a socket type node and give it the supplied name. 58 * Return data and control sockets corresponding to the node. 59 * Returns -1 if error and sets errno. 60 */ 61 int 62 NgMkSockNode(const char *name, int *csp, int *dsp) 63 { 64 char namebuf[NG_NODESIZ]; 65 int cs = -1; /* control socket */ 66 int ds = -1; /* data socket */ 67 int errnosv; 68 69 /* Empty name means no name */ 70 if (name && *name == 0) 71 name = NULL; 72 73 /* Create control socket; this also creates the netgraph node. 74 If we get an EAFNOSUPPORT then the socket node type is 75 not loaded, so load it and try again. */ 76 if ((cs = socket(AF_NETGRAPH, SOCK_DGRAM, NG_CONTROL)) < 0) { 77 if (errno == EAFNOSUPPORT) { 78 if (kldload(NG_SOCKET_KLD) < 0) { 79 errnosv = errno; 80 if (_gNgDebugLevel >= 1) 81 NGLOG("can't load %s", NG_SOCKET_KLD); 82 goto errout; 83 } 84 cs = socket(AF_NETGRAPH, SOCK_DGRAM, NG_CONTROL); 85 if (cs >= 0) 86 goto gotNode; 87 } 88 errnosv = errno; 89 if (_gNgDebugLevel >= 1) 90 NGLOG("socket"); 91 goto errout; 92 } 93 94 gotNode: 95 /* Assign the node the desired name, if any */ 96 if (name != NULL) { 97 u_char sbuf[NG_NODESIZ + NGSA_OVERHEAD]; 98 struct sockaddr_ng *const sg = (struct sockaddr_ng *) sbuf; 99 100 /* Assign name */ 101 strlcpy(sg->sg_data, name, NG_NODESIZ); 102 sg->sg_family = AF_NETGRAPH; 103 sg->sg_len = strlen(sg->sg_data) + 1 + NGSA_OVERHEAD; 104 if (bind(cs, (struct sockaddr *) sg, sg->sg_len) < 0) { 105 errnosv = errno; 106 if (_gNgDebugLevel >= 1) 107 NGLOG("bind(%s)", sg->sg_data); 108 goto errout; 109 } 110 111 /* Save node name */ 112 strlcpy(namebuf, name, sizeof(namebuf)); 113 } else if (dsp != NULL) { 114 union { 115 u_char rbuf[sizeof(struct ng_mesg) + 116 sizeof(struct nodeinfo)]; 117 struct ng_mesg res; 118 } res; 119 struct nodeinfo *const ni = (struct nodeinfo *) res.res.data; 120 121 /* Find out the node ID */ 122 if (NgSendMsg(cs, ".", NGM_GENERIC_COOKIE, 123 NGM_NODEINFO, NULL, 0) < 0) { 124 errnosv = errno; 125 if (_gNgDebugLevel >= 1) 126 NGLOG("send nodeinfo"); 127 goto errout; 128 } 129 if (NgRecvMsg(cs, &res.res, sizeof(res.rbuf), NULL) < 0) { 130 errnosv = errno; 131 if (_gNgDebugLevel >= 1) 132 NGLOG("recv nodeinfo"); 133 goto errout; 134 } 135 136 /* Save node "name" */ 137 snprintf(namebuf, sizeof(namebuf), "[%lx]", (u_long) ni->id); 138 } 139 140 /* Create data socket if desired */ 141 if (dsp != NULL) { 142 u_char sbuf[NG_NODESIZ + 1 + NGSA_OVERHEAD]; 143 struct sockaddr_ng *const sg = (struct sockaddr_ng *) sbuf; 144 145 /* Create data socket, initially just "floating" */ 146 if ((ds = socket(AF_NETGRAPH, SOCK_DGRAM, NG_DATA)) < 0) { 147 errnosv = errno; 148 if (_gNgDebugLevel >= 1) 149 NGLOG("socket"); 150 goto errout; 151 } 152 153 /* Associate the data socket with the node */ 154 snprintf(sg->sg_data, NG_NODESIZ + 1, "%s:", namebuf); 155 sg->sg_family = AF_NETGRAPH; 156 sg->sg_len = strlen(sg->sg_data) + 1 + NGSA_OVERHEAD; 157 if (connect(ds, (struct sockaddr *) sg, sg->sg_len) < 0) { 158 errnosv = errno; 159 if (_gNgDebugLevel >= 1) 160 NGLOG("connect(%s)", sg->sg_data); 161 goto errout; 162 } 163 } 164 165 /* Return the socket(s) */ 166 if (csp) 167 *csp = cs; 168 else 169 close(cs); 170 if (dsp) 171 *dsp = ds; 172 return (0); 173 174 errout: 175 /* Failed */ 176 if (cs >= 0) 177 close(cs); 178 if (ds >= 0) 179 close(ds); 180 errno = errnosv; 181 return (-1); 182 } 183 184 /* 185 * Assign a globally unique name to a node 186 * Returns -1 if error and sets errno. 187 */ 188 int 189 NgNameNode(int cs, const char *path, const char *fmt, ...) 190 { 191 struct ngm_name ngn; 192 va_list args; 193 194 /* Build message arg */ 195 va_start(args, fmt); 196 vsnprintf(ngn.name, sizeof(ngn.name), fmt, args); 197 va_end(args); 198 199 /* Send message */ 200 if (NgSendMsg(cs, path, 201 NGM_GENERIC_COOKIE, NGM_NAME, &ngn, sizeof(ngn)) < 0) { 202 if (_gNgDebugLevel >= 1) 203 NGLOGX("%s: failed", __func__); 204 return (-1); 205 } 206 207 /* Done */ 208 return (0); 209 } 210 211 /* 212 * Read a packet from a data socket 213 * Returns -1 if error and sets errno. 214 */ 215 int 216 NgRecvData(int ds, u_char * buf, size_t len, char *hook) 217 { 218 u_char frombuf[NG_HOOKSIZ + NGSA_OVERHEAD]; 219 struct sockaddr_ng *const from = (struct sockaddr_ng *) frombuf; 220 socklen_t fromlen = sizeof(frombuf); 221 int rtn, errnosv; 222 223 /* Read packet */ 224 rtn = recvfrom(ds, buf, len, 0, (struct sockaddr *) from, &fromlen); 225 if (rtn < 0) { 226 errnosv = errno; 227 if (_gNgDebugLevel >= 1) 228 NGLOG("recvfrom"); 229 errno = errnosv; 230 return (-1); 231 } 232 233 /* Copy hook name */ 234 if (hook != NULL) 235 strlcpy(hook, from->sg_data, NG_HOOKSIZ); 236 237 /* Debugging */ 238 if (_gNgDebugLevel >= 2) { 239 NGLOGX("READ %s from hook \"%s\" (%d bytes)", 240 rtn ? "PACKET" : "EOF", from->sg_data, rtn); 241 if (_gNgDebugLevel >= 3) 242 _NgDebugBytes(buf, rtn); 243 } 244 245 /* Done */ 246 return (rtn); 247 } 248 249 /* 250 * Identical to NgRecvData() except buffer is dynamically allocated. 251 */ 252 int 253 NgAllocRecvData(int ds, u_char **buf, char *hook) 254 { 255 int len; 256 socklen_t optlen; 257 258 optlen = sizeof(len); 259 if (getsockopt(ds, SOL_SOCKET, SO_RCVBUF, &len, &optlen) == -1 || 260 (*buf = malloc(len)) == NULL) 261 return (-1); 262 if ((len = NgRecvData(ds, *buf, len, hook)) < 0) 263 free(*buf); 264 return (len); 265 } 266 267 /* 268 * Write a packet to a data socket. The packet will be sent 269 * out the corresponding node on the specified hook. 270 * Returns -1 if error and sets errno. 271 */ 272 int 273 NgSendData(int ds, const char *hook, const u_char * buf, size_t len) 274 { 275 u_char sgbuf[NG_HOOKSIZ + NGSA_OVERHEAD]; 276 struct sockaddr_ng *const sg = (struct sockaddr_ng *) sgbuf; 277 int errnosv; 278 279 /* Set up destination hook */ 280 sg->sg_family = AF_NETGRAPH; 281 strlcpy(sg->sg_data, hook, NG_HOOKSIZ); 282 sg->sg_len = strlen(sg->sg_data) + 1 + NGSA_OVERHEAD; 283 284 /* Debugging */ 285 if (_gNgDebugLevel >= 2) { 286 NGLOGX("WRITE PACKET to hook \"%s\" (%d bytes)", hook, len); 287 _NgDebugSockaddr(sg); 288 if (_gNgDebugLevel >= 3) 289 _NgDebugBytes(buf, len); 290 } 291 292 /* Send packet */ 293 if (sendto(ds, buf, len, 0, (struct sockaddr *) sg, sg->sg_len) < 0) { 294 errnosv = errno; 295 if (_gNgDebugLevel >= 1) 296 NGLOG("sendto(%s)", sg->sg_data); 297 errno = errnosv; 298 return (-1); 299 } 300 301 /* Done */ 302 return (0); 303 } 304 305