sock.c revision 56708
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: head/lib/libnetgraph/sock.c 56708 2000-01-28 00:48:27Z archie $ 40 * $Whistle: sock.c,v 1.12 1999/01/20 00:57:23 archie Exp $ 41 */ 42 43#include <sys/types.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 */ 59int 60NgMkSockNode(const char *name, int *csp, int *dsp) 61{ 62 char namebuf[NG_NODELEN + 1]; 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 a EPROTONOSUPPORT 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 == EPROTONOSUPPORT) { 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 92gotNode: 93 /* Assign the node the desired name, if any */ 94 if (name != NULL) { 95 u_char sbuf[NG_NODELEN + 3]; 96 struct sockaddr_ng *const sg = (struct sockaddr_ng *) sbuf; 97 98 /* Assign name */ 99 snprintf(sg->sg_data, NG_NODELEN + 1, "%s", name); 100 sg->sg_family = AF_NETGRAPH; 101 sg->sg_len = strlen(sg->sg_data) + 3; 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 snprintf(namebuf, sizeof(namebuf), "%s", name); 111 } else if (dsp != NULL) { 112 u_char rbuf[sizeof(struct ng_mesg) + sizeof(struct nodeinfo)]; 113 struct ng_mesg *const resp = (struct ng_mesg *) rbuf; 114 struct nodeinfo *const ni = (struct nodeinfo *) resp->data; 115 116 /* Find out the node ID */ 117 if (NgSendMsg(cs, ".", NGM_GENERIC_COOKIE, 118 NGM_NODEINFO, NULL, 0) < 0) { 119 errnosv = errno; 120 if (_gNgDebugLevel >= 1) 121 NGLOG("send nodeinfo"); 122 goto errout; 123 } 124 if (NgRecvMsg(cs, resp, sizeof(rbuf), NULL) < 0) { 125 errnosv = errno; 126 if (_gNgDebugLevel >= 1) 127 NGLOG("recv nodeinfo"); 128 goto errout; 129 } 130 131 /* Save node "name" */ 132 snprintf(namebuf, sizeof(namebuf), "[%lx]", (u_long) ni->id); 133 } 134 135 /* Create data socket if desired */ 136 if (dsp != NULL) { 137 u_char sbuf[NG_NODELEN + 4]; 138 struct sockaddr_ng *const sg = (struct sockaddr_ng *) sbuf; 139 140 /* Create data socket, initially just "floating" */ 141 if ((ds = socket(AF_NETGRAPH, SOCK_DGRAM, NG_DATA)) < 0) { 142 errnosv = errno; 143 if (_gNgDebugLevel >= 1) 144 NGLOG("socket"); 145 goto errout; 146 } 147 148 /* Associate the data socket with the node */ 149 snprintf(sg->sg_data, NG_NODELEN + 2, "%s:", namebuf); 150 sg->sg_family = AF_NETGRAPH; 151 sg->sg_len = strlen(sg->sg_data) + 3; 152 if (connect(ds, (struct sockaddr *) sg, sg->sg_len) < 0) { 153 errnosv = errno; 154 if (_gNgDebugLevel >= 1) 155 NGLOG("connect(%s)", sg->sg_data); 156 goto errout; 157 } 158 } 159 160 /* Return the socket(s) */ 161 if (csp) 162 *csp = cs; 163 else 164 close(cs); 165 if (dsp) 166 *dsp = ds; 167 return (0); 168 169errout: 170 /* Failed */ 171 if (cs >= 0) 172 close(cs); 173 if (ds >= 0) 174 close(ds); 175 errno = errnosv; 176 return (-1); 177} 178 179/* 180 * Assign a globally unique name to a node 181 * Returns -1 if error and sets errno. 182 */ 183int 184NgNameNode(int cs, const char *path, const char *fmt, ...) 185{ 186 struct ngm_name ngn; 187 va_list args; 188 189 /* Build message arg */ 190 va_start(args, fmt); 191 vsnprintf(ngn.name, sizeof(ngn.name), fmt, args); 192 va_end(args); 193 194 /* Send message */ 195 if (NgSendMsg(cs, path, 196 NGM_GENERIC_COOKIE, NGM_NAME, &ngn, sizeof(ngn)) < 0) { 197 if (_gNgDebugLevel >= 1) 198 NGLOGX("%s: failed", __FUNCTION__); 199 return (-1); 200 } 201 202 /* Done */ 203 return (0); 204} 205 206/* 207 * Read a packet from a data socket 208 * Returns -1 if error and sets errno. 209 */ 210int 211NgRecvData(int ds, u_char * buf, size_t len, char *hook) 212{ 213 u_char frombuf[NG_HOOKLEN + sizeof(struct sockaddr_ng)]; 214 struct sockaddr_ng *const from = (struct sockaddr_ng *) frombuf; 215 int fromlen = sizeof(frombuf); 216 int rtn, errnosv; 217 218 /* Read packet */ 219 rtn = recvfrom(ds, buf, len, 0, (struct sockaddr *) from, &fromlen); 220 if (rtn < 0) { 221 errnosv = errno; 222 if (_gNgDebugLevel >= 1) 223 NGLOG("recvfrom"); 224 errno = errnosv; 225 return (-1); 226 } 227 228 /* Copy hook name */ 229 if (hook != NULL) 230 snprintf(hook, NG_HOOKLEN + 1, "%s", from->sg_data); 231 232 /* Debugging */ 233 if (_gNgDebugLevel >= 2) { 234 NGLOGX("READ %s from hook \"%s\" (%d bytes)", 235 rtn ? "PACKET" : "EOF", from->sg_data, rtn); 236 if (_gNgDebugLevel >= 3) 237 _NgDebugBytes(buf, rtn); 238 } 239 240 /* Done */ 241 return (rtn); 242} 243 244/* 245 * Write a packet to a data socket. The packet will be sent 246 * out the corresponding node on the specified hook. 247 * Returns -1 if error and sets errno. 248 */ 249int 250NgSendData(int ds, const char *hook, const u_char * buf, size_t len) 251{ 252 u_char sgbuf[NG_HOOKLEN + sizeof(struct sockaddr_ng)]; 253 struct sockaddr_ng *const sg = (struct sockaddr_ng *) sgbuf; 254 int errnosv; 255 256 /* Set up destination hook */ 257 sg->sg_family = AF_NETGRAPH; 258 snprintf(sg->sg_data, NG_HOOKLEN + 1, "%s", hook); 259 sg->sg_len = strlen(sg->sg_data) + 3; 260 261 /* Debugging */ 262 if (_gNgDebugLevel >= 2) { 263 NGLOGX("WRITE PACKET to hook \"%s\" (%d bytes)", hook, len); 264 _NgDebugSockaddr(sg); 265 if (_gNgDebugLevel >= 3) 266 _NgDebugBytes(buf, len); 267 } 268 269 /* Send packet */ 270 if (sendto(ds, buf, len, 0, (struct sockaddr *) sg, sg->sg_len) < 0) { 271 errnosv = errno; 272 if (_gNgDebugLevel >= 1) 273 NGLOG("sendto(%s)", sg->sg_data); 274 errno = errnosv; 275 return (-1); 276 } 277 278 /* Done */ 279 return (0); 280} 281 282