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kplex.c
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kplex.c
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/* kplex: An anything to anything boat data multiplexer for Linux
* Currently this program only supports nmea-0183 data.
* For currently supported interfaces see kplex_mods.h
* Copyright Keith Young 2012-2017
* For copying information, see the file COPYING distributed with this file
*/
/* This file (kplex.c) contains the main body of the program and
* central multiplexing engine. Initialisation and read/write routines are
* defined in interface-specific files
*/
#include "kplex.h"
#include "kplex_mods.h"
#include "version.h"
#include <signal.h>
#include <pwd.h>
#include <time.h>
#include <syslog.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <inttypes.h>
#include <fcntl.h>
/* Macro to identify kplex Proprietary sentences */
#define isprop(sptr) (sptr->len >= 7 && sptr->data[1] == 'P' && sptr->data[2] == 'K' && sptr->data[3] == 'P' && sptr->data[4] == 'X')
/* Globals. Sadly. Used in signal handlers so few other simple options */
pthread_key_t ifkey; /* Key for Thread local pointer to interface struct */
pthread_t reaper; /* tid of thread responsible for reaping */
int timetodie=0; /* Set on receipt of SIGTERM or SIGINT */
time_t graceperiod=3; /* Grace period for unsent data before shutdown (secs)*/
int debuglevel=0; /* debug off by default */
/* Signal handler for SIGUSR1 used by interface threads. Note that this is
* highly dubious: pthread_exit() is not async safe. No associated problems
* reported so far and if they do occur they should occur on exit, but this
* will be changed in the next release
*/
void terminate(int sig)
{
pthread_exit((void *)&sig);
}
/* Sleep function not relying on SIGALRM for thread safety
* Unnecessary on many platforms but here to minimise portability issues
* Could do this with nanosleep() or select()
*/
int mysleep(time_t sleepytime)
{
struct timespec rqtp;
rqtp.tv_sec = sleepytime;
rqtp.tv_nsec=0;
return (nanosleep(&rqtp,NULL));
}
/* functions */
/*
* Check an NMEA 0183 checksum
* Args: pointer to struct senblk
* Returns: 0 if checksum matches checksum field, -1 otherwise
*
*/
int checkcksum (senblk_t *sptr)
{
int cksm=0;
int rcvdcksum=0,i,end;
char *ptr;
for(i=0,end=sptr->len-6,ptr=sptr->data+1; i < end; ptr++,i++)
cksm ^= *ptr;
if (*ptr != '*')
return -1;
for (i=0,++ptr;i<2;i++,ptr++) {
if (*ptr>47 && *ptr<58)
rcvdcksum+=*ptr-48;
else if (*ptr>64 && *ptr<71)
rcvdcksum+=*ptr-55;
else if (*ptr>96 && *ptr<103)
rcvdcksum+=*ptr-87;
if (!i)
rcvdcksum<<=4;
}
if (cksm == rcvdcksum)
return (0);
else
return(-1);
}
/*
* Perform filtering on sentences
* Args: senblk to be filtered, pointer to filter
* Returns: 0 if contents of senblk passes filter, -1 otherwise
*/
int senfilter(senblk_t *sptr, sfilter_t *filter)
{
unsigned int mask = (unsigned int) -1 ^ IDMINORMASK;
sf_rule_t *fptr;
char *cptr;
int i;
time_t tsecs;
struct timeval tv;
/* We shouldn't actually be filtering any NULL packets, but check anyway */
if (sptr == NULL || filter == NULL || filter->rules == NULL)
return(0);
/* inputs should have ensured all sentences ended with \r\n so if we check
* for \r here, we only have to check for \r in the for loops, not \n too */
if (*sptr->data == '\r')
return(1);
for (fptr=filter->rules;fptr;fptr=fptr->next) {
if ((fptr->src.id) && (fptr->src.id != (sptr->src&mask)))
continue;
for (i=0,cptr=sptr->data+1;i<5 && *cptr != '\r';i++,cptr++)
if(fptr->match[i] && fptr->match[i] != *cptr)
break;
if (i!=5)
continue;
if (fptr->type == ACCEPT) {
return(0);
}
if (fptr->type == DENY) {
return(-1);
}
/* type is limit. Hopefully. */
(void) gettimeofday(&tv,NULL);
if (tv.tv_sec < fptr->info.limit->timeout)
return(-1);
if ((tsecs=(tv.tv_sec - fptr->info.limit->timeout)) <
fptr->info.limit->last.tv_sec)
return(-1);
if (tsecs == fptr->info.limit->last.tv_sec &&
(tv.tv_usec < fptr->info.limit->last.tv_usec ))
return(-1);
/* at least timeout since last seen: Update info and pass */
memcpy(&fptr->info.limit->last,&tv,sizeof(struct timeval));
return(0);
}
return(0);
}
/*
* Free a failover rule and any attached source list
* Args: Pointer to rule structure
* Returns: Nothing
*/
void free_srclist(struct srclist *src)
{
struct srclist *tsrc;
for (;src;src=tsrc) {
tsrc=src->next;
if (src->src.name)
free(src->src.name);
free(src);
}
}
/*
* Free a filter
* Args: pointer to filter to be freed
* Returns: Nothing
*/
void free_filter(sfilter_t *fptr)
{
sf_rule_t *rptr,*trptr;
if (fptr == NULL)
return;
pthread_mutex_lock(&fptr->lock);
if (--fptr->refcount) {
pthread_mutex_unlock(&fptr->lock);
return;
}
if (fptr->rules)
for (rptr=fptr->rules;rptr;rptr=trptr) {
trptr=rptr->next;
if (fptr->type == FAILOVER)
free_srclist(rptr->info.source);
free(rptr);
}
free(fptr);
}
/*
* Add a failover source to a failover rule
* Args: address of head of the source list and new source item
* Returns: Nothing
* Side Effect: source item linked into source list according to failover time
*/
void link_src_to_rule (struct srclist **list, struct srclist *src)
{
for (;*list;list=&(*list)->next)
if ((*list)->failtime > src->failtime)
break;
src->next=(*list);
*list=src;
}
/*
* Test if a sentence came from a failover input that is active
* Args: Pointer to filter head, pointer to senblk to be tested
* Returns: 1 if senblk should be passed, 0 if not
*/
int isactive(sfilter_t *filter,senblk_t *sptr)
{
time_t now=time(NULL);
unsigned int mask = (unsigned int) -1 ^ IDMINORMASK;
unsigned int src;
char *cptr,*mptr;
sf_rule_t *rule;
struct srclist *rptr;
time_t last;
int i;
if (filter == NULL || sptr == NULL)
return(1);
src = sptr->src & mask;
for(rule=filter->rules;rule;rule=rule->next) {
for (i=0,cptr=sptr->data+1,mptr=rule->match;i<5;i++,cptr++,mptr++)
if(*mptr && *cptr != *mptr)
break;
if (i == 5)
break;
}
if (!rule)
return(1);
for (last=0,rptr=rule->info.source;rptr;rptr=rptr->next) {
if (rptr->src.id == src) {
rptr->lasttime = now;
if (last+rptr->failtime < now)
return(1);
else
return(0);
}
if (rptr->lasttime > last)
last = rptr->lasttime;
}
return(0);
}
/*
* Add a failover specification
* Args: address of ofilter pointer and pointer to string containing failover
* spec
* Returns: 0 on success, -1 on error
* Side effects: New Failover added to ofilter
*/
int addfailover(sfilter_t **head,char *spec)
{
sf_rule_t *newrule;
struct srclist *src;
char *cptr,*nptr;
int n,done;
time_t now;
if ((newrule=(sf_rule_t *)malloc(sizeof(sf_rule_t))) == NULL) {
return(-1);
}
newrule->info.source=NULL;
for (errno=0,cptr=spec,n=0;n<5;spec++,n++,cptr++) {
if (!*cptr || *cptr== ':') {
free(newrule);
return(-1);
}
newrule->match[n] = (*cptr == '*')?0:*cptr;
}
if (*cptr++ != ':') {
free(newrule);
return(-1);
}
for (now=time(NULL),done=0;!done && *cptr;src=NULL,cptr++) {
if ((src=(struct srclist *)malloc(sizeof(struct srclist))) == NULL) {
free(newrule);
return(-1);
}
for(src->failtime=0;*cptr && *cptr >= '0' && *cptr <= '9';cptr++)
src->failtime=src->failtime*10+(*cptr - '0');
if (*cptr++ != ':')
break;
for(nptr=cptr;*cptr && *cptr != ':';)
cptr++;
if (*cptr)
*cptr='\0';
else
done++;
if ((src->src.name = strdup(nptr)) == NULL) {
logerr(errno,"Failed to allocate memory for string duplication");
free(newrule);
return(-1);
}
src->lasttime=now;
link_src_to_rule(&newrule->info.source,src);
}
if (done) {
if (!*head) {
if (((*head)=(sfilter_t *)malloc(sizeof(sfilter_t)))) {
(*head)->type=FAILOVER;
(*head)->refcount=1;
pthread_mutex_init(&(*head)->lock,NULL);
(*head)->rules=NULL;
}
}
if (*head) {
newrule->next=(*head)->rules;
(*head)->rules=newrule;
return(0);
}
}
if (src)
free(src);
if (newrule->info.source)
free_srclist(newrule->info.source);
free(newrule);
return(-1);
}
/*
* Exit function used by interface handlers. Interface objects are cleaned
* up by the destructor functions of thread local storage
* Args: exit status (unused)
* Returns: Nothing
*/
void iface_thread_exit(int ret)
{
sigset_t set;
sigemptyset(&set);
sigaddset(&set,SIGUSR1);
pthread_sigmask(SIG_BLOCK,&set,NULL);
pthread_exit((void *)&ret);
}
/*
* Initialise an ioqueue
* Args: iface_t to add queue to, size of queue (in senblk structures)
* Returns: 0 on success, -1 on failure
*/
int init_q(iface_t *ifa, size_t size)
{
ioqueue_t *newq;
senblk_t *sptr;
int i;
if ((newq=(ioqueue_t *)malloc(sizeof(ioqueue_t))) == NULL)
return(-1);
if ((newq->base=(senblk_t *)calloc(size,sizeof(senblk_t))) ==NULL) {
i=errno;
free(newq);
errno=i;
return(-1);
}
/* "base" always points to the allocated memory so that we can free() it.
* All senblks initially allocated to the free list
*/
newq->free=newq->base;
/* Initiailise senblk queue pointers */
for (i=0,sptr=newq->free,--size;i<size;++i,++sptr)
sptr->next=sptr+1;
sptr->next = NULL;
newq->qhead = newq->qtail = NULL;
newq->owner=ifa;
pthread_mutex_init(&newq->q_mutex,NULL);
pthread_cond_init(&newq->freshmeat,NULL);
newq->active=1;
ifa->q=newq;
return(0);
}
/*
* Copy information in a senblk structure (data and len only)
* Args: pointers to dest and source senblk structures
* Returns: pointer to dest senblk
*/
senblk_t *senblk_copy(senblk_t *dptr,senblk_t *sptr)
{
dptr->len=sptr->len;
dptr->src=sptr->src;
dptr->next=NULL;
return (senblk_t *) memcpy((void *)dptr->data,(const void *)sptr->data,
sptr->len);
}
/*
* Add an senblk to an ioqueue
* Args: Pointer to senblk and Pointer to queue it is to be added to
* Returns: None
*/
void push_senblk(senblk_t *sptr, ioqueue_t *q)
{
senblk_t *tptr;
pthread_mutex_lock(&q->q_mutex);
if (sptr == NULL) {
/* NULL senblk pointer is magic "off" switch for a queue */
q->active = 0;
} else {
/* Get a senblk from the queue's free list if possible...*/
if (q->free) {
tptr=q->free;
q->free=q->free->next;
} else {
/* ...if not steal from the head of the queue, dropping previous
contents. */
tptr=q->qhead;
q->qhead=q->qhead->next;
if (q->drops < 0)
q->drops++;
DEBUG(4,"Dropped senblk q=%s",(q->owner->name)?q->owner->name:"(unknown)");
}
(void) senblk_copy(tptr,sptr);
/* If there is anything on the queue already, set it's "next" member
to point to the new senblk */
if (q->qtail)
q->qtail->next=tptr;
/* Set tail pointer to the new senblk */
q->qtail=tptr;
/* queue head needs to point to new senblk if there was nothing
previously on the queue */
if (q->qhead == NULL)
q->qhead=tptr;
}
pthread_cond_broadcast(&q->freshmeat);
pthread_mutex_unlock(&q->q_mutex);
}
/*
* Get the next senblk from the head of a queue
* Args: Queue to retrieve from
* Returns: Pointer to next senblk on the queue or NULL if the queue is
* no longer active
* This function blocks until data are available or the queue is shut down
*/
senblk_t *next_senblk(ioqueue_t *q)
{
senblk_t *tptr;
pthread_mutex_lock(&q->q_mutex);
while ((tptr = q->qhead) == NULL) {
/* No data available for reading */
if (!q->active) {
/* Return NULL if the queue has been shut down */
pthread_mutex_unlock(&q->q_mutex);
return ((senblk_t *)NULL);
}
/* Wait until something is available */
pthread_cond_wait(&q->freshmeat,&q->q_mutex);
}
/* set qhead to next element (which may be NULL)
If the last element in the queue, set the tail pointer to NULL too */
if ((q->qhead=tptr->next) == NULL)
q->qtail=NULL;
pthread_mutex_unlock(&q->q_mutex);
return(tptr);
}
/*
* Get the last senblk from a queue, discarding all before it
* Args: Queue to retrieve from
* Returns: Pointer to last senblk on the queue or NULL if the queue is
* no longer active
* This function blocks until data are available or the queue is shut down
*/
senblk_t *last_senblk(ioqueue_t *q)
{
senblk_t *tptr,*nptr;
pthread_mutex_lock(&q->q_mutex);
/* Move all but last senblk on the queue to the free list */
if ((tptr=q->qhead) != NULL) {
for (nptr=tptr->next;nptr;tptr=nptr,nptr=nptr->next) {
tptr->next=q->free;
q->free=tptr;
}
q->qhead=tptr;
}
while ((tptr = q->qhead) == NULL) {
/* No data available for reading */
if (!q->active) {
/* Return NULL if the queue has been shut down */
pthread_mutex_unlock(&q->q_mutex);
return ((senblk_t *)NULL);
}
/* Wait until something is available */
pthread_cond_wait(&q->freshmeat,&q->q_mutex);
}
/* set qhead to next element (which may be NULL)
If the last element in the queue, set the tail pointer to NULL too */
if ((q->qhead=tptr->next) == NULL)
q->qtail=NULL;
pthread_mutex_unlock(&q->q_mutex);
return(tptr);
}
/*
* Flush a queue, returning anything on it to the free list
* Args: Queue to be flushed
* Returns: Nothing
* Side Effect: Returns anything on the queue to the free list
*/
void flush_queue(ioqueue_t *q)
{
pthread_mutex_lock(&q->q_mutex);
if (q->qhead != NULL) {
q->qtail->next = q->free;
q->free=q->qhead;
q->qhead=q->qtail=NULL;
}
pthread_mutex_unlock(&q->q_mutex);
}
/*
* Return a senblk to a queue's free list
* Args: pointer to senblk, and pointer to the queue whose free list it is to
* be added to
* Returns: Nothing
*/
void senblk_free(senblk_t *sptr, ioqueue_t *q)
{
pthread_mutex_lock(&q->q_mutex);
/* Adding to head of free list is quicker than tail */
sptr->next = q->free;
q->free=sptr;
pthread_mutex_unlock(&q->q_mutex);
}
iface_t *get_default_global()
{
iface_t *ifp;
struct if_engine *ifg;
if ((ifp = (iface_t *) malloc(sizeof(iface_t))) == NULL)
return(NULL);
memset((void *) ifp,0,sizeof(iface_t));
ifp->type = GLOBAL;
ifp->options = NULL;
if ((ifg = (struct if_engine *)malloc(sizeof(struct if_engine))) == NULL) {
free(ifp);
return(NULL);
}
ifg->flags=0;
ifg->logto=LOG_DAEMON;
ifp->strict=-1;
ifp->checksum=0;
ifp->info = (void *)ifg;
return(ifp);
}
/* Process proprietary sentence. Anything starting $PKPX
* Args: senblk_t * containing sentence, iface_t pointing to engine.
* currently unused but we may use it later for adding to the engine's queue
* Returns -1 if sentence is unrecognised or invalid, 0 if processing
* should continue with current senblk, 1 if this senblk should be dropped
* but sentence was valid
* Side effects: Swaps Query with Response where appropriate
*/
int process_prop(senblk_t *sptr, iface_t *eptr)
{
if (sptr->data[6] != ',')
return(-1);
switch (sptr->data[5]) {
case 'Q':
/* Query Sentence */
if (sptr->data[7] == 'V') {
sptr->len=sprintf(sptr->data,"$PKPXR,%s",VERSION);
} else
return -1;
break;
case 'C':
/* Command: None currently defined */
case 'R':
/* Response: shouldn't get this */
default:
return -1;
}
sptr->len+=sprintf(sptr->data+sptr->len,"*%02X\r\n",
calcsum(sptr->data+1,sptr->len-1));
sptr->src=0;
return(0);
}
/*
* This is the heart of the multiplexer. All inputs add to the tail of the
* Engine's queue. The engine takes from the head of its queue and copies
* to all outputs on its output list.
* Args: Pointer to information structure (iface_t, cast to void)
* Returns: Nothing
*/
void *run_engine(void *info)
{
senblk_t *sptr;
iface_t *optr;
iface_t *eptr = (iface_t *)info;
int retval=0;
(void) pthread_detach(pthread_self());
for (;;) {
sptr = next_senblk(eptr->q);
if (sptr==NULL)
/* Queue has been marked inactive */
break;
if (isprop(sptr)) {
if (process_prop(sptr,eptr)) {
senblk_free(sptr,eptr->q);
continue;
}
}
if (isactive(eptr->ofilter,sptr)) {
pthread_mutex_lock(&eptr->lists->io_mutex);
/* Traverse list of outputs and push a copy of senblk to each */
for (optr=eptr->lists->outputs;optr;optr=optr->next) {
if ((optr->q) && ((!sptr) ||
((sptr->src != optr->id) || (flag_test(optr,F_LOOPBACK))))) {
push_senblk(sptr,optr->q);
}
}
pthread_mutex_unlock(&eptr->lists->io_mutex);
}
senblk_free(sptr,eptr->q);
}
pthread_exit(&retval);
}
/*
* Start processing an interface and add it to an iolist, input or output,
* depending on direction
* Args: Pointer to interface structure (cast to void *)
* Returns: Nothing
* We should come into this with SIGUSR1 blocked
*/
void start_interface(void *ptr)
{
iface_t *ifa = (iface_t *)ptr;
iface_t **lptr;
iface_t **iptr;
sigset_t set;
sigemptyset(&set);
sigaddset(&set, SIGUSR1);
pthread_mutex_lock(&ifa->lists->io_mutex);
ifa->tid = pthread_self();
if (pthread_setspecific(ifkey,ptr)) {
perror("Falied to set key");
exit(1);
}
for (iptr=&ifa->lists->initialized;*iptr!=ifa;iptr=&(*iptr)->next)
if (*iptr == NULL) {
perror("interface does not exist on initialized list!");
exit(1);
}
*iptr=(*iptr)->next;
/* We've unlinked from initialized. Exit if we've been told to already */
if (ifa->direction == NONE) {
pthread_mutex_unlock(&ifa->lists->io_mutex);
iface_thread_exit(0);
}
/* Set lptr to point to the input or output list, as appropriate */
lptr=(ifa->direction==IN)?&ifa->lists->inputs:&ifa->lists->outputs;
if (*lptr)
ifa->next=(*lptr);
else
ifa->next=NULL;
(*lptr)=ifa;
if (ifa->lists->initialized == NULL)
pthread_cond_broadcast(&ifa->lists->init_cond);
else
while (ifa->lists->initialized)
pthread_cond_wait(&ifa->lists->init_cond,&ifa->lists->io_mutex);
pthread_mutex_unlock(&ifa->lists->io_mutex);
pthread_sigmask(SIG_UNBLOCK,&set,NULL);
if (ifa->direction == IN) {
ifa->read(ifa);
} else
ifa->write(ifa);
}
/*
* link an interface into the initialized list
* Args: interface structure pointer
* Returns: 0 on success. There is no failure condition
* Side Effects: links interface to the initialized list
*/
int link_to_initialized(iface_t *ifa)
{
iface_t **iptr;
pthread_mutex_lock(&ifa->lists->io_mutex);
for (iptr=&ifa->lists->initialized;(*iptr);iptr=&(*iptr)->next);
(*iptr)=ifa;
ifa->next=NULL;
pthread_mutex_unlock(&ifa->lists->io_mutex);
return(0);
}
/*
* Free all the data associated with an interface except the iface_t itself
* Args: Pointer to iface_t to be freed
* Returns: Nothing
* Side Effects: Cleanup routines invoked, de-coupled from any pair, all data
* other than the main interface structure is freed
* Because of dealing with the pair, the io_mutex should be locked before
* involing this routine
*/
void free_if_data(iface_t *ifa)
{
if ((ifa->direction == OUT) && ifa->q) {
/* output interfaces have queues which need freeing */
free(ifa->q->base);
free(ifa->q);
}
free_filter(ifa->ifilter);
free_filter(ifa->ofilter);
if (ifa->info) {
if (ifa->cleanup)
ifa->cleanup(ifa);
free(ifa->info);
}
if (ifa->pair) {
ifa->pair->pair=NULL;
if (ifa->pair->direction == OUT) {
pthread_mutex_lock(&ifa->pair->q->q_mutex);
ifa->pair->q->active=0;
pthread_cond_broadcast(&ifa->pair->q->freshmeat);
pthread_mutex_unlock(&ifa->pair->q->q_mutex);
} else {
if (ifa->pair->tid)
pthread_kill(ifa->pair->tid,SIGUSR1);
else
ifa->pair->direction = NONE;
}
} else
if (ifa->name && !(ifa->id & IDMINORMASK)) {
free(ifa->name);
}
}
/*
* Take an interface off the input or output iolist and place it on the "dead"
* list waiting to be cleaned up
* Args: Pointer to interface structure
* Returns: 0 on success. Might add other possible return vals later
* Should this be broken into link from input/output then link to dead?
*/
int unlink_interface(iface_t *ifa)
{
iface_t **lptr;
iface_t *tptr;
if (ifa->direction != NONE) {
/* Set lptr to point to the input or output list, as appropriate */
lptr=(ifa->direction==IN)?&ifa->lists->inputs:&ifa->lists->outputs;
if ((*lptr) == ifa) {
/* If target interface is the head of the list, set the list pointer
to point to the next interface in the list */
(*lptr)=(*lptr)->next;
} else {
/* Traverse the list until we find the interface before our target and
make its next pointer point to the element after our target */
for (tptr=(*lptr);tptr->next != ifa;tptr=tptr->next);
tptr->next = ifa->next;
}
if (ifa->direction != OUT)
if (!ifa->lists->inputs) {
for(tptr=ifa->lists->outputs;tptr;tptr=tptr->next)
if (tptr->direction == BOTH)
break;
if (tptr == NULL) {
pthread_mutex_lock(&ifa->lists->engine->q->q_mutex);
ifa->lists->engine->q->active=0;
pthread_cond_broadcast(&ifa->lists->engine->q->freshmeat);
pthread_mutex_unlock(&ifa->lists->engine->q->q_mutex);
if (timetodie == 0)
timetodie++;
}
}
}
free_if_data(ifa);
/* Add to the dead list */
if ((tptr=ifa->lists->dead) == NULL)
ifa->lists->dead=ifa;
else {
for(;tptr->next;tptr=tptr->next);
tptr->next=ifa;
}
ifa->next=NULL;
return(0);
}
/*
* Cleanup routine for interfaces, used as destructor for pointer to interface
* structure in the handler thread's local storage
* Args: pointer to interface structure
* Returns: Nothing
*/
void iface_destroy(void *ifptr)
{
iface_t *ifa = (iface_t *) ifptr;
DEBUG(3,"Cleaning up data for exiting %s %s %s id %x",
(ifa->direction == IN)?"input":"output",(ifa->id & IDMINORBITS)?
"connection":"interface",ifa->name,ifa->id);
sigset_t set,saved;
sigemptyset(&set);
sigaddset(&set, SIGUSR1);
pthread_sigmask(SIG_BLOCK, &set, &saved);
pthread_mutex_lock(&ifa->lists->io_mutex);
if (ifa->tid) {
unlink_interface(ifa);
/* Signal the reaper thread */
(void) pthread_kill(reaper,SIGUSR2);
} else
free_if_data(ifa);
pthread_mutex_unlock(&ifa->lists->io_mutex);
pthread_sigmask(SIG_SETMASK,&saved,NULL);
}
/*
* add a filter to an interface
* Args: pointer to filter to be added
* Returns: pointer to filter to be added
*/
sfilter_t *addfilter(sfilter_t *filter)
{
if (!filter)
return (NULL);
pthread_mutex_lock(&filter->lock);
++(filter->refcount);
pthread_mutex_unlock(&filter->lock);
return(filter);
}
/*
* Duplicate an interface
* Used when creating IN/OUT pair for bidirectional communication
* Args: pointer to interface to be duplicated
* Returns: Pointer to duplicate interface
*/
iface_t *ifdup (iface_t *ifa)
{
iface_t *newif;
if ((newif=(iface_t *) malloc(sizeof(iface_t))) == (iface_t *) NULL)
return(NULL);
if (iftypes[ifa->type].ifdup_func) {
if ((newif->info=(*iftypes[ifa->type].ifdup_func)(ifa->info)) == NULL) {
free(newif);
return(NULL);
}
} else
newif->info = NULL;
ifa->pair=newif;
newif->tid=ifa->tid;
newif->flags=ifa->flags;
newif->id=ifa->id;
newif->name=ifa->name;
newif->pair=ifa;
newif->next=NULL;
newif->type=ifa->type;
newif->lists=ifa->lists;
newif->read=ifa->read;
newif->readbuf=ifa->readbuf;
newif->write=ifa->write;
newif->cleanup=ifa->cleanup;
newif->options=NULL;
newif->ifilter=addfilter(ifa->ifilter);
newif->ofilter=addfilter(ifa->ofilter);
newif->checksum=ifa->checksum;
newif->strict=ifa->strict;
return(newif);
}
/*
* Return the path to the kplex config file
* Args: None
* Returns: pointer to name of config file
*
* First choice is conf file in user's home directory, seocnd is global
*/
char *get_def_config()
{
char *confptr;
char *buf;
struct passwd *pw;
if ((confptr=getenv("KPLEXCONF")))
return (confptr);
if ((confptr=getenv("HOME")) == NULL)
if ((pw=getpwuid(getuid())))
confptr=pw->pw_dir;
if (confptr) {
if ((buf = malloc(strlen(confptr)+strlen(KPLEXHOMECONF)+2)) == NULL) {
perror("failed to allocate memory");
exit(1);
}
strcpy(buf,confptr);
strcat(buf,"/");
#ifdef KPLEXHOMECONFOSX
/*
* Deprecate OSX specific config file. This seemed like a good idea at the time
* but has no apparent advantage over ~/.kplex.conf
*/
int doosxconf=1;
size_t osxlen,baselen;
if ((osxlen=strlen(KPLEXHOMECONFOSX)) <
(baselen=strlen(KPLEXOLDHOMECONFOSX))) {
osxlen=baselen;
}
if ((strlen(KPLEXHOMECONF)) < osxlen) {
if (realloc(buf,(baselen=strlen(buf))+osxlen+1) == NULL) {
perror("Can't query OSX config file");
doosxconf=0;
}
}
if (doosxconf) {
strcat(buf,KPLEXOLDHOMECONFOSX);
if (!access(buf,F_OK)) {
logwarn("Use of %s is deprecated for kplex config.\nPlease move this file to ~/%s to suppress this warning",buf,KPLEXHOMECONF);
return(buf);
}
strcpy(buf+baselen,KPLEXHOMECONFOSX);
if (!access(buf,F_OK)) {
return(buf);
}
buf[baselen]='\0';
}
#endif
strcat(buf,KPLEXHOMECONF);
if (!access(buf,F_OK))
return(buf);
free(buf);
}
if (!access(KPLEXGLOBALCONF,F_OK))
return(KPLEXGLOBALCONF);