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 * $FreeBSD: src/lib/libnetgraph/sock.c,v 1.9 2006/10/17 16:56:29 glebius Exp $ 39 * $DragonFly: src/lib/libnetgraph/sock.c,v 1.5 2007/06/03 23:41:25 swildner Exp $ 40 * $Whistle: sock.c,v 1.12 1999/01/20 00:57:23 archie Exp $ 41 */ 42 43 #include <sys/types.h> 44 #include <sys/socket.h> 45 #include <stdarg.h> 46 #include <netgraph7/ng_message.h> 47 #include <netgraph7/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_NODESIZ]; 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 an 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_NODESIZ + NGSA_OVERHEAD]; 97 struct sockaddr_ng *const sg = (struct sockaddr_ng *) sbuf; 98 99 /* Assign name */ 100 strlcpy(sg->sg_data, name, NG_NODESIZ); 101 sg->sg_family = AF_NETGRAPH; 102 sg->sg_len = strlen(sg->sg_data) + 1 + NGSA_OVERHEAD; 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 strlcpy(namebuf, name, sizeof(namebuf)); 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_NODESIZ + 1 + NGSA_OVERHEAD]; 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_NODESIZ + 1, "%s:", namebuf); 151 sg->sg_family = AF_NETGRAPH; 152 sg->sg_len = strlen(sg->sg_data) + 1 + NGSA_OVERHEAD; 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", __func__); 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_HOOKSIZ + NGSA_OVERHEAD]; 215 struct sockaddr_ng *const from = (struct sockaddr_ng *) frombuf; 216 socklen_t 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 strlcpy(hook, from->sg_data, NG_HOOKSIZ); 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 * Identical to NgRecvData() except buffer is dynamically allocated. 247 */ 248 int 249 NgAllocRecvData(int ds, u_char **buf, char *hook) 250 { 251 int len; 252 socklen_t optlen; 253 254 optlen = sizeof(len); 255 if (getsockopt(ds, SOL_SOCKET, SO_RCVBUF, &len, &optlen) == -1 || 256 (*buf = malloc(len)) == NULL) 257 return (-1); 258 if ((len = NgRecvData(ds, *buf, len, hook)) < 0) 259 free(*buf); 260 return (len); 261 } 262 263 /* 264 * Write a packet to a data socket. The packet will be sent 265 * out the corresponding node on the specified hook. 266 * Returns -1 if error and sets errno. 267 */ 268 int 269 NgSendData(int ds, const char *hook, const u_char * buf, size_t len) 270 { 271 u_char sgbuf[NG_HOOKSIZ + NGSA_OVERHEAD]; 272 struct sockaddr_ng *const sg = (struct sockaddr_ng *) sgbuf; 273 int errnosv; 274 275 /* Set up destination hook */ 276 sg->sg_family = AF_NETGRAPH; 277 strlcpy(sg->sg_data, hook, NG_HOOKSIZ); 278 sg->sg_len = strlen(sg->sg_data) + 1 + NGSA_OVERHEAD; 279 280 /* Debugging */ 281 if (_gNgDebugLevel >= 2) { 282 NGLOGX("WRITE PACKET to hook \"%s\" (%d bytes)", hook, len); 283 _NgDebugSockaddr(sg); 284 if (_gNgDebugLevel >= 3) 285 _NgDebugBytes(buf, len); 286 } 287 288 /* Send packet */ 289 if (sendto(ds, buf, len, 0, (struct sockaddr *) sg, sg->sg_len) < 0) { 290 errnosv = errno; 291 if (_gNgDebugLevel >= 1) 292 NGLOG("sendto(%s)", sg->sg_data); 293 errno = errnosv; 294 return (-1); 295 } 296 297 /* Done */ 298 return (0); 299 } 300 301