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/types.h> 42 #include <sys/socket.h> 43 #include <stdarg.h> 44 #include <netgraph/ng_message.h> 45 #include <netgraph/ng_socket.h> 46 47 #include "netgraph.h" 48 #include "internal.h" 49 50 /* The socket node type KLD */ 51 #define NG_SOCKET_KLD "ng_socket.ko" 52 53 /* 54 * Create a socket type node and give it the supplied name. 55 * Return data and control sockets corresponding to the node. 56 * Returns -1 if error and sets errno. 57 */ 58 int 59 NgMkSockNode(const char *name, int *csp, int *dsp) 60 { 61 char namebuf[NG_NODESIZ]; 62 int cs = -1; /* control socket */ 63 int ds = -1; /* data socket */ 64 int errnosv; 65 66 /* Empty name means no name */ 67 if (name && *name == 0) 68 name = NULL; 69 70 /* Create control socket; this also creates the netgraph node. 71 If we get an EAFNOSUPPORT then the socket node type is 72 not loaded, so load it and try again. */ 73 if ((cs = socket(AF_NETGRAPH, SOCK_DGRAM, NG_CONTROL)) < 0) { 74 if (errno == EAFNOSUPPORT) { 75 if (kldload(NG_SOCKET_KLD) < 0) { 76 errnosv = errno; 77 if (_gNgDebugLevel >= 1) 78 NGLOG("can't load %s", NG_SOCKET_KLD); 79 goto errout; 80 } 81 cs = socket(AF_NETGRAPH, SOCK_DGRAM, NG_CONTROL); 82 if (cs >= 0) 83 goto gotNode; 84 } 85 errnosv = errno; 86 if (_gNgDebugLevel >= 1) 87 NGLOG("socket"); 88 goto errout; 89 } 90 91 gotNode: 92 /* Assign the node the desired name, if any */ 93 if (name != NULL) { 94 u_char sbuf[NG_NODESIZ + NGSA_OVERHEAD]; 95 struct sockaddr_ng *const sg = (struct sockaddr_ng *) sbuf; 96 97 /* Assign name */ 98 strlcpy(sg->sg_data, name, NG_NODESIZ); 99 sg->sg_family = AF_NETGRAPH; 100 sg->sg_len = strlen(sg->sg_data) + 1 + NGSA_OVERHEAD; 101 if (bind(cs, (struct sockaddr *) sg, sg->sg_len) < 0) { 102 errnosv = errno; 103 if (_gNgDebugLevel >= 1) 104 NGLOG("bind(%s)", sg->sg_data); 105 goto errout; 106 } 107 108 /* Save node name */ 109 strlcpy(namebuf, name, sizeof(namebuf)); 110 } else if (dsp != NULL) { 111 union { 112 u_char rbuf[sizeof(struct ng_mesg) + 113 sizeof(struct nodeinfo)]; 114 struct ng_mesg res; 115 } res; 116 struct nodeinfo *const ni = (struct nodeinfo *) res.res.data; 117 118 /* Find out the node ID */ 119 if (NgSendMsg(cs, ".", NGM_GENERIC_COOKIE, 120 NGM_NODEINFO, NULL, 0) < 0) { 121 errnosv = errno; 122 if (_gNgDebugLevel >= 1) 123 NGLOG("send nodeinfo"); 124 goto errout; 125 } 126 if (NgRecvMsg(cs, &res.res, sizeof(res.rbuf), NULL) < 0) { 127 errnosv = errno; 128 if (_gNgDebugLevel >= 1) 129 NGLOG("recv nodeinfo"); 130 goto errout; 131 } 132 133 /* Save node "name" */ 134 snprintf(namebuf, sizeof(namebuf), "[%lx]", (u_long) ni->id); 135 } 136 137 /* Create data socket if desired */ 138 if (dsp != NULL) { 139 u_char sbuf[NG_NODESIZ + 1 + NGSA_OVERHEAD]; 140 struct sockaddr_ng *const sg = (struct sockaddr_ng *) sbuf; 141 142 /* Create data socket, initially just "floating" */ 143 if ((ds = socket(AF_NETGRAPH, SOCK_DGRAM, NG_DATA)) < 0) { 144 errnosv = errno; 145 if (_gNgDebugLevel >= 1) 146 NGLOG("socket"); 147 goto errout; 148 } 149 150 /* Associate the data socket with the node */ 151 snprintf(sg->sg_data, NG_NODESIZ + 1, "%s:", namebuf); 152 sg->sg_family = AF_NETGRAPH; 153 sg->sg_len = strlen(sg->sg_data) + 1 + NGSA_OVERHEAD; 154 if (connect(ds, (struct sockaddr *) sg, sg->sg_len) < 0) { 155 errnosv = errno; 156 if (_gNgDebugLevel >= 1) 157 NGLOG("connect(%s)", sg->sg_data); 158 goto errout; 159 } 160 } 161 162 /* Return the socket(s) */ 163 if (csp) 164 *csp = cs; 165 else 166 close(cs); 167 if (dsp) 168 *dsp = ds; 169 return (0); 170 171 errout: 172 /* Failed */ 173 if (cs >= 0) 174 close(cs); 175 if (ds >= 0) 176 close(ds); 177 errno = errnosv; 178 return (-1); 179 } 180 181 /* 182 * Assign a globally unique name to a node 183 * Returns -1 if error and sets errno. 184 */ 185 int 186 NgNameNode(int cs, const char *path, const char *fmt, ...) 187 { 188 struct ngm_name ngn; 189 va_list args; 190 191 /* Build message arg */ 192 va_start(args, fmt); 193 vsnprintf(ngn.name, sizeof(ngn.name), fmt, args); 194 va_end(args); 195 196 /* Send message */ 197 if (NgSendMsg(cs, path, 198 NGM_GENERIC_COOKIE, NGM_NAME, &ngn, sizeof(ngn)) < 0) { 199 if (_gNgDebugLevel >= 1) 200 NGLOGX("%s: failed", __func__); 201 return (-1); 202 } 203 204 /* Done */ 205 return (0); 206 } 207 208 /* 209 * Read a packet from a data socket 210 * Returns -1 if error and sets errno. 211 */ 212 int 213 NgRecvData(int ds, u_char * buf, size_t len, char *hook) 214 { 215 u_char frombuf[NG_HOOKSIZ + NGSA_OVERHEAD]; 216 struct sockaddr_ng *const from = (struct sockaddr_ng *) frombuf; 217 socklen_t fromlen = sizeof(frombuf); 218 int rtn, errnosv; 219 220 /* Read packet */ 221 rtn = recvfrom(ds, buf, len, 0, (struct sockaddr *) from, &fromlen); 222 if (rtn < 0) { 223 errnosv = errno; 224 if (_gNgDebugLevel >= 1) 225 NGLOG("recvfrom"); 226 errno = errnosv; 227 return (-1); 228 } 229 230 /* Copy hook name */ 231 if (hook != NULL) 232 strlcpy(hook, from->sg_data, NG_HOOKSIZ); 233 234 /* Debugging */ 235 if (_gNgDebugLevel >= 2) { 236 NGLOGX("READ %s from hook \"%s\" (%d bytes)", 237 rtn ? "PACKET" : "EOF", from->sg_data, rtn); 238 if (_gNgDebugLevel >= 3) 239 _NgDebugBytes(buf, rtn); 240 } 241 242 /* Done */ 243 return (rtn); 244 } 245 246 /* 247 * Identical to NgRecvData() except buffer is dynamically allocated. 248 */ 249 int 250 NgAllocRecvData(int ds, u_char **buf, char *hook) 251 { 252 int len; 253 socklen_t optlen; 254 255 optlen = sizeof(len); 256 if (getsockopt(ds, SOL_SOCKET, SO_RCVBUF, &len, &optlen) == -1 || 257 (*buf = malloc(len)) == NULL) 258 return (-1); 259 if ((len = NgRecvData(ds, *buf, len, hook)) < 0) 260 free(*buf); 261 return (len); 262 } 263 264 /* 265 * Write a packet to a data socket. The packet will be sent 266 * out the corresponding node on the specified hook. 267 * Returns -1 if error and sets errno. 268 */ 269 int 270 NgSendData(int ds, const char *hook, const u_char * buf, size_t len) 271 { 272 u_char sgbuf[NG_HOOKSIZ + NGSA_OVERHEAD]; 273 struct sockaddr_ng *const sg = (struct sockaddr_ng *) sgbuf; 274 int errnosv; 275 276 /* Set up destination hook */ 277 sg->sg_family = AF_NETGRAPH; 278 strlcpy(sg->sg_data, hook, NG_HOOKSIZ); 279 sg->sg_len = strlen(sg->sg_data) + 1 + NGSA_OVERHEAD; 280 281 /* Debugging */ 282 if (_gNgDebugLevel >= 2) { 283 NGLOGX("WRITE PACKET to hook \"%s\" (%d bytes)", hook, len); 284 _NgDebugSockaddr(sg); 285 if (_gNgDebugLevel >= 3) 286 _NgDebugBytes(buf, len); 287 } 288 289 /* Send packet */ 290 if (sendto(ds, buf, len, 0, (struct sockaddr *) sg, sg->sg_len) < 0) { 291 errnosv = errno; 292 if (_gNgDebugLevel >= 1) 293 NGLOG("sendto(%s)", sg->sg_data); 294 errno = errnosv; 295 return (-1); 296 } 297 298 /* Done */ 299 return (0); 300 } 301 302