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15 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as
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19 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
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21 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
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23 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
24 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
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30 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
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33 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
36 * Author: Archie Cobbs <archie@whistle.com>
38 * $Whistle: msg.c,v 1.9 1999/01/20 00:57:23 archie Exp $
41 #include <sys/types.h>
42 #include <sys/socket.h>
44 #include <stdatomic.h>
45 #include <netgraph/ng_message.h>
46 #include <netgraph/ng_socket.h>
51 /* Next message token value */
52 static _Atomic(unsigned int) gMsgId;
54 /* For delivering both messages and replies */
55 static int NgDeliverMsg(int cs, const char *path,
56 const struct ng_mesg *hdr, const void *args, size_t arglen);
59 * Send a message to a node using control socket node "cs".
60 * Returns -1 if error and sets errno appropriately.
61 * If successful, returns the message ID (token) used.
64 NgSendMsg(int cs, const char *path,
65 int cookie, int cmd, const void *args, size_t arglen)
69 /* Prepare message header */
70 memset(&msg, 0, sizeof(msg));
71 msg.header.version = NG_VERSION;
72 msg.header.typecookie = cookie;
73 msg.header.token = atomic_fetch_add(&gMsgId, 1) & INT_MAX;
74 msg.header.flags = NGF_ORIG;
76 snprintf((char *)msg.header.cmdstr, NG_CMDSTRSIZ, "cmd%d", cmd);
79 if (NgDeliverMsg(cs, path, &msg, args, arglen) < 0)
81 return (msg.header.token);
85 * Send a message given in ASCII format. We first ask the node to translate
86 * the command into binary, and then we send the binary.
89 NgSendAsciiMsg(int cs, const char *path, const char *fmt, ...)
91 struct ng_mesg *reply, *binary, *ascii;
92 char *buf, *cmd, *args;
96 /* Parse out command and arguments */
97 va_start(fmtargs, fmt);
98 vasprintf(&buf, fmt, fmtargs);
103 /* Parse out command, arguments */
104 for (cmd = buf; isspace(*cmd); cmd++)
106 for (args = cmd; *args != '\0' && !isspace(*args); args++)
109 while (isspace(*args))
113 /* Get a bigger buffer to hold inner message header plus arg string */
114 if ((ascii = malloc(sizeof(struct ng_mesg)
115 + strlen(args) + 1)) == NULL) {
119 memset(ascii, 0, sizeof(*ascii));
121 /* Build inner header (only need cmdstr, arglen, and data fields) */
122 strncpy((char *)ascii->header.cmdstr, cmd,
123 sizeof(ascii->header.cmdstr) - 1);
124 strcpy(ascii->data, args);
125 ascii->header.arglen = strlen(ascii->data) + 1;
128 /* Send node a request to convert ASCII to binary */
129 if (NgSendMsg(cs, path, NGM_GENERIC_COOKIE, NGM_ASCII2BINARY,
130 (u_char *)ascii, sizeof(*ascii) + ascii->header.arglen) < 0) {
137 if (NgAllocRecvMsg(cs, &reply, NULL) < 0)
140 /* Now send binary version */
141 binary = (struct ng_mesg *)reply->data;
142 binary->header.token = atomic_fetch_add(&gMsgId, 1) & INT_MAX;
143 binary->header.version = NG_VERSION;
145 path, binary, binary->data, binary->header.arglen) < 0) {
149 token = binary->header.token;
155 * Send a message that is a reply to a previously received message.
156 * Returns -1 and sets errno on error, otherwise returns zero.
159 NgSendReplyMsg(int cs, const char *path,
160 const struct ng_mesg *msg, const void *args, size_t arglen)
164 /* Prepare message header */
166 rep.header.flags = NGF_RESP;
168 /* Deliver message */
169 return (NgDeliverMsg(cs, path, &rep, args, arglen));
173 * Send a message to a node using control socket node "cs".
174 * Returns -1 if error and sets errno appropriately, otherwise zero.
177 NgDeliverMsg(int cs, const char *path,
178 const struct ng_mesg *hdr, const void *args, size_t arglen)
180 u_char sgbuf[NG_PATHSIZ + NGSA_OVERHEAD];
181 struct sockaddr_ng *const sg = (struct sockaddr_ng *) sgbuf;
192 if ((buf = malloc(sizeof(*msg) + arglen)) == NULL) {
194 if (_gNgDebugLevel >= 1)
199 msg = (struct ng_mesg *) buf;
201 /* Finalize message */
203 msg->header.arglen = arglen;
204 memcpy(msg->data, args, arglen);
206 /* Prepare socket address */
207 sg->sg_family = AF_NETGRAPH;
208 /* XXX handle overflow */
209 strlcpy(sg->sg_data, path, NG_PATHSIZ);
210 sg->sg_len = strlen(sg->sg_data) + 1 + NGSA_OVERHEAD;
213 if (_gNgDebugLevel >= 2) {
214 NGLOGX("SENDING %s:",
215 (msg->header.flags & NGF_RESP) ? "RESPONSE" : "MESSAGE");
216 _NgDebugSockaddr(sg);
217 _NgDebugMsg(msg, sg->sg_data);
221 if (sendto(cs, msg, sizeof(*msg) + arglen,
222 0, (struct sockaddr *) sg, sg->sg_len) < 0) {
224 if (_gNgDebugLevel >= 1)
225 NGLOG("sendto(%s)", sg->sg_data);
230 /* Wait for reply if there should be one. */
231 if (msg->header.cmd & NGM_HASREPLY && !(msg->header.flags & NGF_RESP)) {
236 rfds.events = POLLIN;
238 n = poll(&rfds, 1, INFTIM);
241 if (_gNgDebugLevel >= 1)
249 free(buf); /* OK if buf is NULL */
255 * Receive a control message.
257 * On error, this returns -1 and sets errno.
258 * Otherwise, it returns the length of the received reply.
261 NgRecvMsg(int cs, struct ng_mesg *rep, size_t replen, char *path)
263 u_char sgbuf[NG_PATHSIZ + NGSA_OVERHEAD];
264 struct sockaddr_ng *const sg = (struct sockaddr_ng *) sgbuf;
265 socklen_t sglen = sizeof(sgbuf);
269 len = recvfrom(cs, rep, replen, 0, (struct sockaddr *) sg, &sglen);
272 if (_gNgDebugLevel >= 1)
277 strlcpy(path, sg->sg_data, NG_PATHSIZ);
280 if (_gNgDebugLevel >= 2) {
281 NGLOGX("RECEIVED %s:",
282 (rep->header.flags & NGF_RESP) ? "RESPONSE" : "MESSAGE");
283 _NgDebugSockaddr(sg);
284 _NgDebugMsg(rep, sg->sg_data);
296 * Identical to NgRecvMsg() except buffer is dynamically allocated.
299 NgAllocRecvMsg(int cs, struct ng_mesg **rep, char *path)
304 optlen = sizeof(len);
305 if (getsockopt(cs, SOL_SOCKET, SO_RCVBUF, &len, &optlen) == -1 ||
306 (*rep = malloc(len)) == NULL)
308 if ((len = NgRecvMsg(cs, *rep, len, path)) < 0)
314 * Receive a control message and convert the arguments to ASCII
317 NgRecvAsciiMsg(int cs, struct ng_mesg *reply, size_t replen, char *path)
319 struct ng_mesg *msg, *ascii;
320 int bufSize, errnosv;
323 /* Allocate buffer */
324 bufSize = 2 * sizeof(*reply) + replen;
325 if ((buf = malloc(bufSize)) == NULL)
327 msg = (struct ng_mesg *)buf;
328 ascii = (struct ng_mesg *)msg->data;
330 /* Get binary message */
331 if (NgRecvMsg(cs, msg, bufSize, path) < 0)
333 memcpy(reply, msg, sizeof(*msg));
335 /* Ask originating node to convert the arguments to ASCII */
336 if (NgSendMsg(cs, path, NGM_GENERIC_COOKIE,
337 NGM_BINARY2ASCII, msg, sizeof(*msg) + msg->header.arglen) < 0)
339 if (NgRecvMsg(cs, msg, bufSize, NULL) < 0)
342 /* Copy result to client buffer */
343 if (sizeof(*ascii) + ascii->header.arglen > replen) {
351 strncpy(reply->data, ascii->data, ascii->header.arglen);
359 * Identical to NgRecvAsciiMsg() except buffer is dynamically allocated.
362 NgAllocRecvAsciiMsg(int cs, struct ng_mesg **reply, char *path)
367 optlen = sizeof(len);
368 if (getsockopt(cs, SOL_SOCKET, SO_RCVBUF, &len, &optlen) == -1 ||
369 (*reply = malloc(len)) == NULL)
371 if ((len = NgRecvAsciiMsg(cs, *reply, len, path)) < 0)