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 #include <sys/types.h> 43 #include <sys/socket.h> 44 #include <stdarg.h> 45 #include <netgraph/ng_message.h> 46 #include <netgraph/ng_socket.h> 47 48 #include "netgraph.h" 49 #include "internal.h" 50 51 /* The socket node type KLD */ 52 #define NG_SOCKET_KLD "ng_socket.ko" 53 54 /* 55 * Create a socket type node and give it the supplied name. 56 * Return data and control sockets corresponding to the node. 57 * Returns -1 if error and sets errno. 58 */ 59 int 60 NgMkSockNode(const char *name, int *csp, int *dsp) 61 { 62 char namebuf[NG_NODESIZ]; 63 int cs = -1; /* control socket */ 64 int ds = -1; /* data socket */ 65 int errnosv; 66 67 /* Empty name means no name */ 68 if (name && *name == 0) 69 name = NULL; 70 71 /* Create control socket; this also creates the netgraph node. 72 If we get an EAFNOSUPPORT then the socket node type is 73 not loaded, so load it and try again. */ 74 if ((cs = socket(AF_NETGRAPH, SOCK_DGRAM, NG_CONTROL)) < 0) { 75 if (errno == EAFNOSUPPORT) { 76 if (kldload(NG_SOCKET_KLD) < 0) { 77 errnosv = errno; 78 if (_gNgDebugLevel >= 1) 79 NGLOG("can't load %s", NG_SOCKET_KLD); 80 goto errout; 81 } 82 cs = socket(AF_NETGRAPH, SOCK_DGRAM, NG_CONTROL); 83 if (cs >= 0) 84 goto gotNode; 85 } 86 errnosv = errno; 87 if (_gNgDebugLevel >= 1) 88 NGLOG("socket"); 89 goto errout; 90 } 91 92 gotNode: 93 /* Assign the node the desired name, if any */ 94 if (name != NULL) { 95 u_char sbuf[NG_NODESIZ + NGSA_OVERHEAD]; 96 struct sockaddr_ng *const sg = (struct sockaddr_ng *) sbuf; 97 98 /* Assign name */ 99 strlcpy(sg->sg_data, name, NG_NODESIZ); 100 sg->sg_family = AF_NETGRAPH; 101 sg->sg_len = strlen(sg->sg_data) + 1 + NGSA_OVERHEAD; 102 if (bind(cs, (struct sockaddr *) sg, sg->sg_len) < 0) { 103 errnosv = errno; 104 if (_gNgDebugLevel >= 1) 105 NGLOG("bind(%s)", sg->sg_data); 106 goto errout; 107 } 108 109 /* Save node name */ 110 strlcpy(namebuf, name, sizeof(namebuf)); 111 } else if (dsp != NULL) { 112 union { 113 u_char rbuf[sizeof(struct ng_mesg) + 114 sizeof(struct nodeinfo)]; 115 struct ng_mesg res; 116 } res; 117 struct nodeinfo *const ni = (struct nodeinfo *) res.res.data; 118 119 /* Find out the node ID */ 120 if (NgSendMsg(cs, ".", NGM_GENERIC_COOKIE, 121 NGM_NODEINFO, NULL, 0) < 0) { 122 errnosv = errno; 123 if (_gNgDebugLevel >= 1) 124 NGLOG("send nodeinfo"); 125 goto errout; 126 } 127 if (NgRecvMsg(cs, &res.res, sizeof(res.rbuf), NULL) < 0) { 128 errnosv = errno; 129 if (_gNgDebugLevel >= 1) 130 NGLOG("recv nodeinfo"); 131 goto errout; 132 } 133 134 /* Save node "name" */ 135 snprintf(namebuf, sizeof(namebuf), "[%lx]", (u_long) ni->id); 136 } 137 138 /* Create data socket if desired */ 139 if (dsp != NULL) { 140 u_char sbuf[NG_NODESIZ + 1 + NGSA_OVERHEAD]; 141 struct sockaddr_ng *const sg = (struct sockaddr_ng *) sbuf; 142 143 /* Create data socket, initially just "floating" */ 144 if ((ds = socket(AF_NETGRAPH, SOCK_DGRAM, NG_DATA)) < 0) { 145 errnosv = errno; 146 if (_gNgDebugLevel >= 1) 147 NGLOG("socket"); 148 goto errout; 149 } 150 151 /* Associate the data socket with the node */ 152 snprintf(sg->sg_data, NG_NODESIZ + 1, "%s:", namebuf); 153 sg->sg_family = AF_NETGRAPH; 154 sg->sg_len = strlen(sg->sg_data) + 1 + NGSA_OVERHEAD; 155 if (connect(ds, (struct sockaddr *) sg, sg->sg_len) < 0) { 156 errnosv = errno; 157 if (_gNgDebugLevel >= 1) 158 NGLOG("connect(%s)", sg->sg_data); 159 goto errout; 160 } 161 } 162 163 /* Return the socket(s) */ 164 if (csp) 165 *csp = cs; 166 else 167 close(cs); 168 if (dsp) 169 *dsp = ds; 170 return (0); 171 172 errout: 173 /* Failed */ 174 if (cs >= 0) 175 close(cs); 176 if (ds >= 0) 177 close(ds); 178 errno = errnosv; 179 return (-1); 180 } 181 182 /* 183 * Assign a globally unique name to a node 184 * Returns -1 if error and sets errno. 185 */ 186 int 187 NgNameNode(int cs, const char *path, const char *fmt, ...) 188 { 189 struct ngm_name ngn; 190 va_list args; 191 192 /* Build message arg */ 193 va_start(args, fmt); 194 vsnprintf(ngn.name, sizeof(ngn.name), fmt, args); 195 va_end(args); 196 197 /* Send message */ 198 if (NgSendMsg(cs, path, 199 NGM_GENERIC_COOKIE, NGM_NAME, &ngn, sizeof(ngn)) < 0) { 200 if (_gNgDebugLevel >= 1) 201 NGLOGX("%s: failed", __func__); 202 return (-1); 203 } 204 205 /* Done */ 206 return (0); 207 } 208 209 /* 210 * Read a packet from a data socket 211 * Returns -1 if error and sets errno. 212 */ 213 int 214 NgRecvData(int ds, u_char * buf, size_t len, char *hook) 215 { 216 u_char frombuf[NG_HOOKSIZ + NGSA_OVERHEAD]; 217 struct sockaddr_ng *const from = (struct sockaddr_ng *) frombuf; 218 socklen_t fromlen = sizeof(frombuf); 219 int rtn, errnosv; 220 221 /* Read packet */ 222 rtn = recvfrom(ds, buf, len, 0, (struct sockaddr *) from, &fromlen); 223 if (rtn < 0) { 224 errnosv = errno; 225 if (_gNgDebugLevel >= 1) 226 NGLOG("recvfrom"); 227 errno = errnosv; 228 return (-1); 229 } 230 231 /* Copy hook name */ 232 if (hook != NULL) 233 strlcpy(hook, from->sg_data, NG_HOOKSIZ); 234 235 /* Debugging */ 236 if (_gNgDebugLevel >= 2) { 237 NGLOGX("READ %s from hook \"%s\" (%d bytes)", 238 rtn ? "PACKET" : "EOF", from->sg_data, rtn); 239 if (_gNgDebugLevel >= 3) 240 _NgDebugBytes(buf, rtn); 241 } 242 243 /* Done */ 244 return (rtn); 245 } 246 247 /* 248 * Identical to NgRecvData() except buffer is dynamically allocated. 249 */ 250 int 251 NgAllocRecvData(int ds, u_char **buf, char *hook) 252 { 253 int len; 254 socklen_t optlen; 255 256 optlen = sizeof(len); 257 if (getsockopt(ds, SOL_SOCKET, SO_RCVBUF, &len, &optlen) == -1 || 258 (*buf = malloc(len)) == NULL) 259 return (-1); 260 if ((len = NgRecvData(ds, *buf, len, hook)) < 0) 261 free(*buf); 262 return (len); 263 } 264 265 /* 266 * Write a packet to a data socket. The packet will be sent 267 * out the corresponding node on the specified hook. 268 * Returns -1 if error and sets errno. 269 */ 270 int 271 NgSendData(int ds, const char *hook, const u_char * buf, size_t len) 272 { 273 u_char sgbuf[NG_HOOKSIZ + NGSA_OVERHEAD]; 274 struct sockaddr_ng *const sg = (struct sockaddr_ng *) sgbuf; 275 int errnosv; 276 277 /* Set up destination hook */ 278 sg->sg_family = AF_NETGRAPH; 279 strlcpy(sg->sg_data, hook, NG_HOOKSIZ); 280 sg->sg_len = strlen(sg->sg_data) + 1 + NGSA_OVERHEAD; 281 282 /* Debugging */ 283 if (_gNgDebugLevel >= 2) { 284 NGLOGX("WRITE PACKET to hook \"%s\" (%d bytes)", hook, len); 285 _NgDebugSockaddr(sg); 286 if (_gNgDebugLevel >= 3) 287 _NgDebugBytes(buf, len); 288 } 289 290 /* Send packet */ 291 if (sendto(ds, buf, len, 0, (struct sockaddr *) sg, sg->sg_len) < 0) { 292 errnosv = errno; 293 if (_gNgDebugLevel >= 1) 294 NGLOG("sendto(%s)", sg->sg_data); 295 errno = errnosv; 296 return (-1); 297 } 298 299 /* Done */ 300 return (0); 301 } 302 303