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xpans.c
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xpans.c
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/*
* Copyright (c) 1999-2003 Smithsonian Astrophysical Observatory
*/
#include <xpap.h>
#if HAVE_LIBPTHREAD
#include <pthread.h>
static pthread_mutex_t xpans_mutex = PTHREAD_MUTEX_INITIALIZER;
#endif
#define MAX_ERRORS 5
static int doproxy=0;
static unsigned int localhost_ip=0;
extern char *optarg;
extern int optind;
typedef struct entrec{
struct entrec *next;
char *method;
char *xclass;
char *name;
char *type;
char *user;
char *info;
} *Entry, EntryRec;
typedef struct reqrec{
struct reqrec *next;
int sock;
unsigned int ip;
int port;
Entry entry;
} *Req, ReqRec;
static char *helpbuf = "xpans commands:\nhelp\t\t\t\t# print this help message\nlist\t\t\t\t# list all entries\nlookup class:name type user\t# lookup entries of this type and user\n";
static int keepalive=0;
static int ksec=0;
static int mtype = 0;
static int nentry = 0;
static int exconn=0;
static int sock=-1;
static char *logfile=NULL;
static time_t lastt=(time_t)0;
static time_t curt=(time_t)0;
static FILE *securefp=NULL;
static Req reqhead=NULL;
static int LookupReq _PRx((Req xreq, char *lbuf, int flag));
static int ListReq _PRx((Req xreq, int flag));
static void HelpReq _PRx((Req xreq, int flag));
#ifdef __STDC__
static void SecureLog(char *format, ...);
#else
static void SecureLog();
#endif
#if HAVE_LIBPTHREAD
/*
*----------------------------------------------------------------------------
*
* Routine: doxpaloop
*
* Purpose: start up XPAMainLoop in another thread
*
* Returns: NONE
*
*----------------------------------------------------------------------------
*/
#ifdef ANSI_FUNC
void *doxpaloop(void *arg)
#else
void *doxpaloop(arg)
void *arg;
#endif
{
XPAMainLoop();
return (void *)NULL;
}
#endif
/*
*----------------------------------------------------------------------------
*
* Routine: receive_proxy
*
* Purpose: receive callback for a proxy request
*
* Returns: 0 for success, -1 for failure
*
*----------------------------------------------------------------------------
*/
#ifdef ANSI_FUNC
static int
receive_proxy (void *client_data, void *call_data, char *paramlist,
char *buf, int len)
#else
int receive_proxy(client_data, call_data, paramlist, buf, len)
void *client_data;
void *call_data;
char *paramlist;
char *buf;
int len;
#endif
{
XPA xpa = (XPA)call_data;
char *xtemplate;
char *mode;
char *err;
char *s;
char xmode[SZ_LINE];
char tbuf[SZ_LINE];
int fd=0;
int pfd=-1;
int got=0;
Req req=NULL;
xtemplate = xpa->comm->target;
mode = xpa->comm->info;
fd = xpa->comm->datafd;
/* get proxy fd and associated xpans request struct */
if( mode ){
strcpy(xmode, mode);
if( keyword(xmode, "nsproxy", tbuf, SZ_LINE) ){
pfd = strtol(tbuf, &s, 0);
if( s != tbuf ){
for(req=reqhead; req!=NULL; req=req->next){
if( req->sock == pfd ){
break;
}
}
}
}
}
if( pfd < 0 ){
snprintf(tbuf, SZ_LINE, "invalid or missing proxy fd");
XPAError(xpa, tbuf);
return(-1);
}
else if( req == NULL ){
snprintf(tbuf, SZ_LINE, "could not find xpans fd for proxy fd %d", pfd);
XPAError(xpa, tbuf);
return(-1);
}
FPRINTF((stderr, "%sreceive_proxy: fd=%d xtmpl=%s mode=%s paramlist=%s\n",
_sp, xpa->comm->cmdfd, xtemplate, mode,
paramlist?paramlist:"NONE"));
if( XPASetFd(xpa, xtemplate, paramlist, mode, fd, NULL, &err, 1) ){
/* display errors and free up strings */
if( err != NULL ){
XPAError(xpa, err);
xfree(err);
got = -1;
}
}
else{
got = -1;
}
FPRINTF((stderr, "%sreceive_proxy done\n", _sp));
return(got);
}
/*
*----------------------------------------------------------------------------
*
* Routine: send_proxy
*
* Purpose: send callback for a proxy request
*
* Returns: 0 for success, -1 for failure
*
*----------------------------------------------------------------------------
*/
#ifdef ANSI_FUNC
static int
send_proxy (void *client_data, void *call_data, char *paramlist,
char **buf, size_t *len)
#else
static int send_proxy(client_data, call_data, paramlist, buf, len)
void *client_data;
void *call_data;
char *paramlist;
char **buf;
size_t *len;
#endif
{
XPA xpa = (XPA)call_data;
char *xtemplate;
char *mode;
char *err;
char *s;
char xmode[SZ_LINE];
char tbuf[SZ_LINE];
int fd=0;
int pfd=-1;
int got=0;
Req req=NULL;
xtemplate = xpa->comm->target;
mode = xpa->comm->info;
fd = xpa->comm->datafd;
/* get proxy fd and associated xpans request struct */
if( mode ){
strcpy(xmode, mode);
if( keyword(xmode, "nsproxy", tbuf, SZ_LINE) ){
pfd = strtol(tbuf, &s, 0);
if( s != tbuf ){
for(req=reqhead; req!=NULL; req=req->next){
if( req->sock == pfd ){
break;
}
}
}
}
}
if( pfd < 0 ){
snprintf(tbuf, SZ_LINE, "invalid or missing proxy fd");
XPAError(xpa, tbuf);
return(-1);
}
else if( req == NULL ){
snprintf(tbuf, SZ_LINE, "could not find xpans fd for proxy fd %d", pfd);
XPAError(xpa, tbuf);
return(-1);
}
FPRINTF((stderr, "%ssend_proxy: fd=%d xtemplate=%s mode=%s paramlist=%s\n",
_sp, xpa->comm->cmdfd, xtemplate, mode, paramlist?paramlist:"NONE"));
if( XPAGetFd(xpa, xtemplate, paramlist, mode, &fd, NULL, &err, 1) ){
/* display errors and free up strings */
if( err != NULL ){
XPAError(xpa, err);
xfree(err);
got = -1;
}
}
else{
got = -1;
}
FPRINTF((stderr, "%ssend_proxy done\n", _sp));
return(got);
}
/*
*----------------------------------------------------------------------------
*
* Routine: receive_cb
*
* Purpose: receive callback for XPA access point
*
* Returns: 0 for success, -1 for failure
*
*----------------------------------------------------------------------------
*/
#ifdef ANSI_FUNC
static int
receive_cb (void *client_data, void *call_data, char *paramlist,
char *buf, size_t len)
#else
int receive_cb(client_data, call_data, paramlist, buf, len)
void *client_data;
void *call_data;
char *paramlist;
char *buf;
size_t len;
#endif
{
XPA xpa = (XPA)call_data;
char tbuf[SZ_LINE];
/* if target is not xpans, we have a proxy request */
snprintf(tbuf, SZ_LINE, "%s:%s", XPANS_CLASS, XPANS_NAME);
if( strcmp(xpa->comm->target, tbuf) ){
if( doproxy )
return(receive_proxy(client_data, call_data, paramlist, buf, len));
else{
XPAError(xpa, "proxy requests not enabled in this xpans");
return(-1);
}
}
/* nothing to do for normal receive callback */
XPAError(xpa, "no receive function defined for xpans");
return(-1);
}
/*
*----------------------------------------------------------------------------
*
* Routine: send_cb
*
* Purpose: send callback for XPA access point
*
* Returns: 0 for success, -1 for failure
*
*----------------------------------------------------------------------------
*/
#ifdef ANSI_FUNC
static int
send_cb (void *client_data, void *call_data, char *paramlist,
char **buf, size_t *len)
#else
static int send_cb(client_data, call_data, paramlist, buf, len)
void *client_data;
void *call_data;
char *paramlist;
char **buf;
size_t *len;
#endif
{
XPA xpa = (XPA)call_data;
Req req;
char tbuf[SZ_LINE];
char ebuf[SZ_LINE];
char tmpl[SZ_LINE];
char type[SZ_LINE];
char users[SZ_LINE];
int got=0;
int wp=0;
/* if target is not xpans, we have a proxy request */
snprintf(tbuf, SZ_LINE, "%s:%s", XPANS_CLASS, XPANS_NAME);
if( strcmp(xpa->comm->target, tbuf) ){
if( doproxy )
return(send_proxy(client_data, call_data, paramlist, buf, len));
else{
XPAError(xpa, "proxy requests not enabled in this xpans");
return(-1);
}
}
if( paramlist && *paramlist )
SecureLog("xpaget from host %x:%d (%s): %s",
xpa->comm->cmdip, xpa->comm->cmdport,
getiphost(xpa->comm->cmdip),
(paramlist && *paramlist)?paramlist:"<no params>");
else
SecureLog("xpaget from host %x:%d (%s)",
xpa->comm->cmdip, xpa->comm->cmdport,
getiphost(xpa->comm->cmdip));
if( (req = (Req)xcalloc(1, sizeof(ReqRec))) == NULL )
return(-1);
if( xpa_datafd(xpa) >= 0 ){
req->sock = xpa_datafd(xpa);
}
#if HAVE_LIBPTHREAD
/* lock the mutex before processing a request */
if( doproxy >= 2 ) pthread_mutex_lock(&xpans_mutex);
#endif
/* execute the appropriate routine */
if( paramlist && *paramlist && word(paramlist, tbuf, &wp) ){
if( !strcmp(tbuf, "list") ){
ListReq(req, 0);
}
else if( !strcmp(tbuf, "help") ){
HelpReq(req, 0);
}
else if( !strcmp(tbuf, "lookup") ){
if( word(paramlist, tmpl, &wp ) ){
/* look for type */
if( !word(paramlist, type, &wp ) )
strcpy(type, XPA_ACLS);
/* look for users */
if( !word(paramlist, users, &wp ) )
strcpy(users, "*");
snprintf(tbuf, SZ_LINE, "%s %s %s", tmpl, type, users);
LookupReq(req, tbuf, 0);
}
else{
strcpy(ebuf,
"XPA$ERROR 'lookup' requires class:name [type] [user]\n");
XPAPuts(NULL, req->sock, ebuf, XPALongTimeout());
got = -1;
}
}
else{
snprintf(ebuf, SZ_LINE, "XPA$ERROR unknown command '%s'\n", tbuf);
XPAPuts(NULL, req->sock, ebuf, XPALongTimeout());
got = -1;
}
}
else {
ListReq(req, 0);
}
#if HAVE_LIBPTHREAD
/* unlock the mutex */
if( doproxy >= 2 ) pthread_mutex_unlock(&xpans_mutex);
#endif
/* clean up */
if( req ) xfree(req);
return(got);
}
/*
*----------------------------------------------------------------------------
*
* Routine: Log
*
* Purpose: write all names to a backup log
*
* Returns: none
*
*----------------------------------------------------------------------------
*/
#ifdef ANSI_FUNC
static void
Log (void)
#else
static void Log()
#endif
{
FILE *fp;
Req req;
Entry entry;
if( !logfile )
return;
if( !strcasecmp(logfile, "stdout") )
fp = stdout;
else if( (fp=fopen(logfile, "w")) == NULL )
return;
for(req=reqhead; req!=NULL; req=req->next){
for(entry=req->entry; entry!=NULL; entry=entry->next){
fprintf(fp, "# add %s %s %s %s %s\n",
entry->method, entry->xclass,
entry->name, entry->type, entry->user);
/* last one */
if( entry->next == NULL )
fprintf(fp, "xpaset -p %s -nsconnect\n", entry->method);
}
}
if( fp != stdout )
fclose(fp);
}
/*
*----------------------------------------------------------------------------
*
* Routine: SecureLog
*
* Purpose: write security info to a backup log
*
* Returns: none
*
*----------------------------------------------------------------------------
*/
#ifdef __STDC__
void SecureLog(char *format, ...)
{
char sbuf[SZ_LINE];
time_t t;
va_list args;
va_start(args, format);
#else
void SecureLog(va_alist) va_dcl
{
char *format;
char sbuf[SZ_LINE];
time_t t;
va_list args;
va_start(args);
format = va_arg(args, char *);
#endif
if( securefp == NULL )
return;
t = time(NULL);
vsnprintf(sbuf, SZ_LINE, format, args);
fprintf(securefp, "%s", sbuf);
fprintf(securefp, "\t%s", ctime(&t));
fflush(securefp);
}
/*
*----------------------------------------------------------------------------
*
* Routine: SplitArg
*
* Purpose: split the specified argument by changing a ":" to a space
* splitting is done in place
*
* Returns: none
*
*----------------------------------------------------------------------------
*/
#ifdef ANSI_FUNC
static void
SplitArg (char *buf, int arg)
#else
static void SplitArg(buf, arg)
char *buf;
int arg;
#endif
{
int i;
char *s;
/* point to beginning of buffer */
s = buf;
/* skip over previous args */
for(i=0; i<arg; i++){
/* skip up to white space */
while( *s && !isspace((int)*s) )
s++;
/* skip over white space to next arg */
while( *s && isspace((int)*s) )
s++;
}
/* we now are pointing at the arg in question.
look for a ':' (up to next white space) and change to space */
while( *s && !isspace((int)*s) ){
if( *s == ':' ){
*s = ' ';
break;
}
else
s++;
}
}
/*
*----------------------------------------------------------------------------
*
* Routine: NewEntry
*
* Purpose: allocate a new XPA entry
*
* Returns: entry struct
*
*----------------------------------------------------------------------------
*/
#ifdef ANSI_FUNC
static int
NewEntry (Req req,
char *method, char *xclass, char *name,
char *type, char *user, char *info)
#else
static int NewEntry(req, method, xclass, name, type, user, info)
Req req;
char *method;
char *xclass;
char *name;
char *type;
char *user;
char *info;
#endif
{
Entry entry, cur;
Req xreq;
/* don't duplicate with any other entry */
for(xreq=reqhead; xreq!=NULL; xreq=xreq->next){
for(entry=xreq->entry; entry!=NULL; entry=entry->next){
if( !strcmp(entry->method, method) &&
!strcmp(entry->xclass, xclass) &&
!strcmp(entry->name, name) &&
!strcmp(entry->type, type) &&
!strcmp(entry->user, user) &&
!strcmp(entry->info, info) )
return(1);
}
}
/* allocate new entry */
if( (entry = (Entry)xcalloc(1, sizeof(EntryRec))) == NULL )
return(-1);
/* fill in the blanks */
entry->xclass = xstrdup(xclass);
entry->name = xstrdup(name);
entry->method = xstrdup(method);
entry->type = xstrdup(type);
entry->user = xstrdup(user);
entry->info = xstrdup(info);
FPRINTF((stderr, "%sNewEntry: %s %s %s %s %s %s\n", _sp,
xclass, name, method, type, user, info));
/* add this to end of the list */
if( req->entry == NULL ){
req->entry = entry;
}
else{
for(cur=req->entry; cur->next!=NULL; cur=cur->next)
;
cur->next = entry;
}
/* inc the total number of entries */
nentry++;
/* return the news */
return(0);
}
/*
*----------------------------------------------------------------------------
*
* Routine: FreeEntry
*
* Purpose: free up an XPA entry
*
* Returns: none
*
*----------------------------------------------------------------------------
*/
#ifdef ANSI_FUNC
static void
FreeEntry (Req req, Entry entry)
#else
static void FreeEntry(req, entry)
Req req;
Entry entry;
#endif
{
Entry cur;
/* remove this entry from the list so it can't be found */
if( entry == req->entry ){
req->entry = req->entry->next;
}
else{
for(cur=req->entry; cur!=NULL; cur=cur->next){
if( entry == cur->next ){
cur->next = entry->next;
break;
}
}
}
FPRINTF((stderr, "%sFreeEntry: %s %s\n", _sp, entry->xclass, entry->name));
/* now free this struct */
if( entry->method )
xfree(entry->method);
if( entry->xclass )
xfree(entry->xclass);
if( entry->name )
xfree(entry->name);
if( entry->type )
xfree(entry->type);
if( entry->user )
xfree(entry->user);
if( entry->info )
xfree(entry->info);
xfree(entry);
}
/*
*----------------------------------------------------------------------------
*
* Routine: DelEntry
*
* Purpose: Delete an XPA entry
*
* Returns: none
*
*----------------------------------------------------------------------------
*/
#ifdef ANSI_FUNC
static int
DelEntry (Req req, char *method)
#else
static int DelEntry(req, method)
Req req;
char *method;
#endif
{
Entry cur, tcur;
int got=-1;
for(cur=req->entry; cur!=NULL; ){
tcur = cur->next;
if( ((method == NULL) || (*method == '\0')) ||
(!strcmp(method, "@") && (*cur->method == '@')) ||
!strcmp(cur->method, method) ){
FreeEntry(req, cur);
got = 0;
}
cur = tcur;
}
return(got);
}
/*
*----------------------------------------------------------------------------
*
* Routine: FirewallEntry
*
* Purpose: Correct the method to take a firewall into account
* we do this by taking the ip from the socket packet instead
* of the specified ip, if they differ
*
* Returns: none
*
*----------------------------------------------------------------------------
*/
#ifdef ANSI_FUNC
static void
FirewallEntry (Req req, char *method)
#else
static void FirewallEntry(req, method)
Req req;
char *method;
#endif
{
unsigned int ip;
unsigned short port;
if( mtype != XPA_INET )
return;
if( XPAParseIpPort(method, &ip, &port) ){
if( (ip != req->ip) && (req->ip != localhost_ip) ){
SecureLog("firewall %d: changing ip from %x to %x",
req->sock, ip, req->ip);
snprintf(method, SZ_LINE, "%x:%d", req->ip, port);
}
}
}
/*
*----------------------------------------------------------------------------
*
* Routine: NewReq
*
* Purpose: allocate a new XPA request struct
*
* Returns: Req struct
*
*----------------------------------------------------------------------------
*/
#ifdef ANSI_FUNC
static Req
NewReq (int sock, unsigned int ip, int port)
#else
static Req NewReq(sock, ip, port)
int sock;
unsigned int ip;
int port;
#endif
{
Req req;
Req cur;
if( (req = (Req)xcalloc(1, sizeof(ReqRec))) == NULL )
return(NULL);
/* fill in the blanks */
req->sock = sock;
req->ip = ip;
req->port = port;
/* add this to end of the list */
if( reqhead == NULL ){
reqhead = req;
}
else{
for(cur=reqhead; cur->next!=NULL; cur=cur->next)
;
cur->next = req;
}
/* return the news */
return(req);
}
/*
*----------------------------------------------------------------------------
*
* Routine: FreeReq
*
* Purpose: free up an XPA request entry
*
* Returns: none
*
*----------------------------------------------------------------------------
*/
#ifdef ANSI_FUNC
static void
FreeReq (Req req)
#else
static void FreeReq(req)
Req req;
#endif
{
Req cur;
/* remove this entry from the list so it can't be found */
if( req == reqhead ){
reqhead = req->next;
}
else{
for(cur=reqhead; cur!=NULL; cur=cur->next){
if( req == cur->next ){
cur->next = req->next;
break;
}
}
}
/* close the communication channel */
close(req->sock);
/* now free this struct */
xfree(req);
}
/*
*----------------------------------------------------------------------------
*
* Routine: AddReq
*
* Purpose: add an XPA entry to the list
*
* Returns: none
*
*----------------------------------------------------------------------------
*/
#ifdef ANSI_FUNC
static void
AddReq (Req req, char *lbuf, int flag)
#else
static void AddReq(req, lbuf, flag)
Req req;
char *lbuf;
int flag;
#endif
{
int got;
char xclass[SZ_LINE];
char name[SZ_LINE];
char method[SZ_LINE];
char omethod[SZ_LINE];
char type[SZ_LINE];
char user[SZ_LINE];
char tbuf[SZ_LINE];
SplitArg(lbuf, 1);
got = sscanf(lbuf, "%s %s %s %s %s", method, xclass, name, type, user);
if( got == 5 ){
/* fix method if we can determine its been through a firewall */
strcpy(omethod, method);
FirewallEntry(req, method);
if( !strcmp(omethod, method) )
strcpy(tbuf, method);
else
snprintf(tbuf, SZ_LINE, "%s,%s", method, omethod);
/* add the new entry */
got = NewEntry(req, tbuf, xclass, name, type, user, XPA_DEF_CLIENT_INFO);
Log();
if( flag ){
switch(got){
case -1:
XPAPuts(NULL, req->sock, "XPA$ERROR could not add entry\n",
XPALongTimeout());
break;
case 0:
XPAPuts(NULL, req->sock, "XPA$OK\n", XPALongTimeout());
break;
case 1:
XPAPuts(NULL, req->sock, "XPA$EXISTS entry already exists\n",
XPALongTimeout());
break;
default:
XPAPuts(NULL, req->sock, "XPA$ERROR could not add entry\n",
XPALongTimeout());
break;
}
}
}
else{
strcpy(tbuf,
"XPA$ERROR 'add' requires 4 args: ip:port class:name type user\n");
XPAPuts(NULL, req->sock, tbuf, XPALongTimeout());
}
}
/*
*----------------------------------------------------------------------------
*
* Routine: AddProxyReq
*
* Purpose: add an XPA proxy entry to the list
*
* Returns: none
*
*----------------------------------------------------------------------------
*/
#ifdef ANSI_FUNC
static void
AddProxyReq (Req req, char *lbuf, int flag)
#else
static void AddProxyReq(req, lbuf, flag)
Req req;
char *lbuf;
int flag;
#endif
{
int got=0;
char xclass[SZ_LINE];
char name[SZ_LINE];
char method[SZ_LINE];
char omethod[SZ_LINE];
char type[SZ_LINE];
char user[SZ_LINE];
char info[SZ_LINE];
char tbuf[SZ_LINE];
/* make sure we are accepting proxy requests */
if( !doproxy ){
strcpy(tbuf,
"XPA$ERROR: proxy requests not enabled in this xpans\n");
XPAPuts(NULL, req->sock, tbuf, XPALongTimeout());
return;
}
SplitArg(lbuf, 1);
got = sscanf(lbuf, "%s %s %s %s %s", method, xclass, name, type, user);
if( got == 5 ){
if( XPAMethod(method) == XPA_INET ){
/* fix method if we can determine its been through a firewall */
strcpy(omethod, method);
FirewallEntry(req, method);
if( !strcmp(omethod, method) )
snprintf(tbuf, SZ_LINE, "@%s", method);
else
snprintf(tbuf, SZ_LINE, "@%s,%s", method, omethod);
}
else{
strcpy(tbuf,
"XPA$ERROR 'proxy' requires INET method\n");
XPAPuts(NULL, req->sock, tbuf, XPALongTimeout());
return;
}
/* save info */
snprintf(info, SZ_LINE, "nsproxy=%d,ns=(%s,%s,%s,%s),dofork=true",
req->sock, xclass, name, method, omethod);
/* add the new entry */
got = NewEntry(req, tbuf, xclass, name, type, user, info);
Log();
if( flag ){
switch(got){
case -1:
XPAPuts(NULL, req->sock, "XPA$ERROR could not add entry\n",
XPALongTimeout());
break;
case 0:
XPAPuts(NULL, req->sock, "XPA$OK\n", XPALongTimeout());
break;
case 1:
XPAPuts(NULL, req->sock, "XPA$EXISTS entry already exists\n",
XPALongTimeout());
break;
default:
XPAPuts(NULL, req->sock, "XPA$ERROR could not add entry\n",
XPALongTimeout());
break;
}
}
}
else{
strcpy(tbuf,
"XPA$ERROR 'proxy' requires 4 args: ip:port class:name type user\n");
XPAPuts(NULL, req->sock, tbuf, XPALongTimeout());
}
}
/*
*----------------------------------------------------------------------------
*
* Routine: DelReq
*
* Purpose: delete an XPA entry from the list
*
* Returns: none
*
*----------------------------------------------------------------------------
*/
#ifdef ANSI_FUNC
static void
DelReq (Req req, char *lbuf, int flag)
#else
static void DelReq(req, lbuf, flag)
Req req;
char *lbuf;
int flag;
#endif
{
int got=0;
char method[SZ_LINE];