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Be a bit smarter when identifying a netgraph node

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(don't dereference NULL).
This commit is contained in:
Brian Somers 1999-11-09 19:05:48 +00:00
parent 53151fddc0
commit 4012527343
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=53062
1 changed files with 9 additions and 55 deletions
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64
usr.sbin/ppp/ether.c
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@ -612,6 +612,11 @@ ether_Create(struct physical *p)
dev->timeout = p->cfg.cd.delay;
dev->connected = CARRIER_PENDING;
/* Hook things up so that we monitor dev->cs */
p->desc.UpdateSet = ether_UpdateSet;
p->desc.IsSet = ether_IsSet;
p->desc.Read = ether_DescriptorRead;
} else {
/* See if we're a netgraph socket */
struct sockaddr_ng ngsock;
@ -621,53 +626,11 @@ ether_Create(struct physical *p)
sz = sizeof ngsock;
if (getsockname(p->fd, sock, &sz) != -1 && sock->sa_family == AF_NETGRAPH) {
/*
* It's a netgraph node... determine the hook name and set things up
* It's a netgraph node... We can't determine hook names etc, so we
* stay pretty impartial....
*/
log_Printf(LogPHASE, "%s: Link is a netgraph node\n", p->link.name);
if (NgSendMsg(dev->cs, ".", NGM_GENERIC_COOKIE, NGM_LISTHOOKS,
NULL, 0) < 0) {
log_Printf(LogWARN, "Cannot send a netgraph message to stdin: %s\n",
strerror(errno));
close(p->fd);
p->fd = -1;
return NULL;
}
/* Get our list back */
resp = (struct ng_mesg *)rbuf;
if (NgRecvMsg(dev->cs, resp, sizeof rbuf, NULL) < 0) {
log_Printf(LogWARN, "Cannot get netgraph response: %s\n",
strerror(errno));
close(p->fd);
p->fd = -1;
return NULL;
}
hlist = (const struct hooklist *)resp->data;
ninfo = &hlist->nodeinfo;
/*
* Make sure we've got the right type of node...
* Can it be anything else ?
*/
if (strncmp(ninfo->type, NG_SOCKET_NODE_TYPE,
sizeof NG_SOCKET_NODE_TYPE - 1)) {
log_Printf(LogWARN, "Unexpected netgraph node type ``%s'' (wanted ``"
NG_SOCKET_NODE_TYPE "'')\n", ninfo->type);
close(p->fd);
p->fd = -1;
return NULL;
}
if (ninfo->hooks != 1) {
log_Printf(LogWARN, "Can't handle netgraph node with %d hooks\n",
ninfo->hooks);
close(p->fd);
p->fd = -1;
return NULL;
}
/* Looks good.... lets allocate a device structure */
if ((dev = malloc(sizeof *dev)) == NULL) {
log_Printf(LogWARN, "%s: Cannot allocate an ether device: %s\n",
p->link.name, strerror(errno));
@ -677,22 +640,13 @@ ether_Create(struct physical *p)
dev->cs = -1;
dev->timeout = 0;
dev->connected = CARRIER_OK;
strncpy(dev->hook, hlist->link->ourhook, sizeof dev->hook - 1);
dev->hook[sizeof dev->hook - 1] = '\0';
log_Printf(LogDEBUG, "Using netgraph hook ``.:%s'' -> [%x]:%s\n",
dev->hook, hlist->link->nodeinfo.id, hlist->link->peerhook);
*dev->hook = '\0';
}
}
if (dev) {
memcpy(&dev->dev, &baseetherdevice, sizeof dev->dev);
/* Hook things up so that we monitor dev->cs */
p->desc.UpdateSet = ether_UpdateSet;
p->desc.IsSet = ether_IsSet;
p->desc.Read = ether_DescriptorRead;
physical_SetupStack(p, dev->dev.name, PHYSICAL_FORCE_SYNCNOACF);
/* Moan about (and fix) invalid LCP configurations */