1 2 /* 3 * sock.c 4 * 5 * Copyright (c) 1996-1999 Whistle Communications, Inc. 6 * All rights reserved. 7 * 8 * Subject to the following obligations and disclaimer of warranty, use and 9 * redistribution of this software, in source or object code forms, with or 10 * without modifications are expressly permitted by Whistle Communications; 11 * provided, however, that: 12 * 1. Any and all reproductions of the source or object code must include the 13 * copyright notice above and the following disclaimer of warranties; and 14 * 2. No rights are granted, in any manner or form, to use Whistle 15 * Communications, Inc. trademarks, including the mark "WHISTLE 16 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 17 * such appears in the above copyright notice or in the software. 18 * 19 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 20 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 21 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 22 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 23 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 24 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 25 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 26 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 27 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 28 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 29 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 30 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 31 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 32 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 33 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 34 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 35 * OF SUCH DAMAGE. 36 * 37 * Author: Archie Cobbs <archie@whistle.com> 38 * 39 * $FreeBSD: src/lib/libnetgraph/sock.c,v 1.2 2000/01/28 00:48:27 archie Exp $ 40 * $DragonFly: src/lib/libnetgraph/sock.c,v 1.3 2003/08/08 04:18:34 dillon Exp $ 41 * $Whistle: sock.c,v 1.12 1999/01/20 00:57:23 archie Exp $ 42 */ 43 44 #include <sys/types.h> 45 #include <stdarg.h> 46 #include <netgraph/ng_message.h> 47 #include <netgraph/socket/ng_socket.h> 48 49 #include "netgraph.h" 50 #include "internal.h" 51 52 /* The socket node type KLD */ 53 #define NG_SOCKET_KLD "ng_socket.ko" 54 55 /* 56 * Create a socket type node and give it the supplied name. 57 * Return data and control sockets corresponding to the node. 58 * Returns -1 if error and sets errno. 59 */ 60 int 61 NgMkSockNode(const char *name, int *csp, int *dsp) 62 { 63 char namebuf[NG_NODELEN + 1]; 64 int cs = -1; /* control socket */ 65 int ds = -1; /* data socket */ 66 int errnosv; 67 68 /* Empty name means no name */ 69 if (name && *name == 0) 70 name = NULL; 71 72 /* Create control socket; this also creates the netgraph node. 73 If we get a EPROTONOSUPPORT then the socket node type is 74 not loaded, so load it and try again. */ 75 if ((cs = socket(AF_NETGRAPH, SOCK_DGRAM, NG_CONTROL)) < 0) { 76 if (errno == EPROTONOSUPPORT) { 77 if (kldload(NG_SOCKET_KLD) < 0) { 78 errnosv = errno; 79 if (_gNgDebugLevel >= 1) 80 NGLOG("can't load %s", NG_SOCKET_KLD); 81 goto errout; 82 } 83 cs = socket(AF_NETGRAPH, SOCK_DGRAM, NG_CONTROL); 84 if (cs >= 0) 85 goto gotNode; 86 } 87 errnosv = errno; 88 if (_gNgDebugLevel >= 1) 89 NGLOG("socket"); 90 goto errout; 91 } 92 93 gotNode: 94 /* Assign the node the desired name, if any */ 95 if (name != NULL) { 96 u_char sbuf[NG_NODELEN + 3]; 97 struct sockaddr_ng *const sg = (struct sockaddr_ng *) sbuf; 98 99 /* Assign name */ 100 snprintf(sg->sg_data, NG_NODELEN + 1, "%s", name); 101 sg->sg_family = AF_NETGRAPH; 102 sg->sg_len = strlen(sg->sg_data) + 3; 103 if (bind(cs, (struct sockaddr *) sg, sg->sg_len) < 0) { 104 errnosv = errno; 105 if (_gNgDebugLevel >= 1) 106 NGLOG("bind(%s)", sg->sg_data); 107 goto errout; 108 } 109 110 /* Save node name */ 111 snprintf(namebuf, sizeof(namebuf), "%s", name); 112 } else if (dsp != NULL) { 113 u_char rbuf[sizeof(struct ng_mesg) + sizeof(struct nodeinfo)]; 114 struct ng_mesg *const resp = (struct ng_mesg *) rbuf; 115 struct nodeinfo *const ni = (struct nodeinfo *) resp->data; 116 117 /* Find out the node ID */ 118 if (NgSendMsg(cs, ".", NGM_GENERIC_COOKIE, 119 NGM_NODEINFO, NULL, 0) < 0) { 120 errnosv = errno; 121 if (_gNgDebugLevel >= 1) 122 NGLOG("send nodeinfo"); 123 goto errout; 124 } 125 if (NgRecvMsg(cs, resp, sizeof(rbuf), NULL) < 0) { 126 errnosv = errno; 127 if (_gNgDebugLevel >= 1) 128 NGLOG("recv nodeinfo"); 129 goto errout; 130 } 131 132 /* Save node "name" */ 133 snprintf(namebuf, sizeof(namebuf), "[%lx]", (u_long) ni->id); 134 } 135 136 /* Create data socket if desired */ 137 if (dsp != NULL) { 138 u_char sbuf[NG_NODELEN + 4]; 139 struct sockaddr_ng *const sg = (struct sockaddr_ng *) sbuf; 140 141 /* Create data socket, initially just "floating" */ 142 if ((ds = socket(AF_NETGRAPH, SOCK_DGRAM, NG_DATA)) < 0) { 143 errnosv = errno; 144 if (_gNgDebugLevel >= 1) 145 NGLOG("socket"); 146 goto errout; 147 } 148 149 /* Associate the data socket with the node */ 150 snprintf(sg->sg_data, NG_NODELEN + 2, "%s:", namebuf); 151 sg->sg_family = AF_NETGRAPH; 152 sg->sg_len = strlen(sg->sg_data) + 3; 153 if (connect(ds, (struct sockaddr *) sg, sg->sg_len) < 0) { 154 errnosv = errno; 155 if (_gNgDebugLevel >= 1) 156 NGLOG("connect(%s)", sg->sg_data); 157 goto errout; 158 } 159 } 160 161 /* Return the socket(s) */ 162 if (csp) 163 *csp = cs; 164 else 165 close(cs); 166 if (dsp) 167 *dsp = ds; 168 return (0); 169 170 errout: 171 /* Failed */ 172 if (cs >= 0) 173 close(cs); 174 if (ds >= 0) 175 close(ds); 176 errno = errnosv; 177 return (-1); 178 } 179 180 /* 181 * Assign a globally unique name to a node 182 * Returns -1 if error and sets errno. 183 */ 184 int 185 NgNameNode(int cs, const char *path, const char *fmt, ...) 186 { 187 struct ngm_name ngn; 188 va_list args; 189 190 /* Build message arg */ 191 va_start(args, fmt); 192 vsnprintf(ngn.name, sizeof(ngn.name), fmt, args); 193 va_end(args); 194 195 /* Send message */ 196 if (NgSendMsg(cs, path, 197 NGM_GENERIC_COOKIE, NGM_NAME, &ngn, sizeof(ngn)) < 0) { 198 if (_gNgDebugLevel >= 1) 199 NGLOGX("%s: failed", __FUNCTION__); 200 return (-1); 201 } 202 203 /* Done */ 204 return (0); 205 } 206 207 /* 208 * Read a packet from a data socket 209 * Returns -1 if error and sets errno. 210 */ 211 int 212 NgRecvData(int ds, u_char * buf, size_t len, char *hook) 213 { 214 u_char frombuf[NG_HOOKLEN + sizeof(struct sockaddr_ng)]; 215 struct sockaddr_ng *const from = (struct sockaddr_ng *) frombuf; 216 int fromlen = sizeof(frombuf); 217 int rtn, errnosv; 218 219 /* Read packet */ 220 rtn = recvfrom(ds, buf, len, 0, (struct sockaddr *) from, &fromlen); 221 if (rtn < 0) { 222 errnosv = errno; 223 if (_gNgDebugLevel >= 1) 224 NGLOG("recvfrom"); 225 errno = errnosv; 226 return (-1); 227 } 228 229 /* Copy hook name */ 230 if (hook != NULL) 231 snprintf(hook, NG_HOOKLEN + 1, "%s", from->sg_data); 232 233 /* Debugging */ 234 if (_gNgDebugLevel >= 2) { 235 NGLOGX("READ %s from hook \"%s\" (%d bytes)", 236 rtn ? "PACKET" : "EOF", from->sg_data, rtn); 237 if (_gNgDebugLevel >= 3) 238 _NgDebugBytes(buf, rtn); 239 } 240 241 /* Done */ 242 return (rtn); 243 } 244 245 /* 246 * Write a packet to a data socket. The packet will be sent 247 * out the corresponding node on the specified hook. 248 * Returns -1 if error and sets errno. 249 */ 250 int 251 NgSendData(int ds, const char *hook, const u_char * buf, size_t len) 252 { 253 u_char sgbuf[NG_HOOKLEN + sizeof(struct sockaddr_ng)]; 254 struct sockaddr_ng *const sg = (struct sockaddr_ng *) sgbuf; 255 int errnosv; 256 257 /* Set up destination hook */ 258 sg->sg_family = AF_NETGRAPH; 259 snprintf(sg->sg_data, NG_HOOKLEN + 1, "%s", hook); 260 sg->sg_len = strlen(sg->sg_data) + 3; 261 262 /* Debugging */ 263 if (_gNgDebugLevel >= 2) { 264 NGLOGX("WRITE PACKET to hook \"%s\" (%d bytes)", hook, len); 265 _NgDebugSockaddr(sg); 266 if (_gNgDebugLevel >= 3) 267 _NgDebugBytes(buf, len); 268 } 269 270 /* Send packet */ 271 if (sendto(ds, buf, len, 0, (struct sockaddr *) sg, sg->sg_len) < 0) { 272 errnosv = errno; 273 if (_gNgDebugLevel >= 1) 274 NGLOG("sendto(%s)", sg->sg_data); 275 errno = errnosv; 276 return (-1); 277 } 278 279 /* Done */ 280 return (0); 281 } 282 283