046e0ee259
the ini buffer was not reset when we got eof in the message body read causing a endless loop. instead of defining our own read9pmsg() function, just handle the first read specially when we consumed the first 4 bytes for the "impo" protocol escape check.
934 lines
17 KiB
C
934 lines
17 KiB
C
/*
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* exportfs - Export a plan 9 name space across a network
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*/
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#include <u.h>
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#include <libc.h>
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#include <auth.h>
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#include <fcall.h>
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#include <libsec.h>
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#define Extern
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#include "exportfs.h"
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#define QIDPATH ((1LL<<48)-1)
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vlong newqid = 0;
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enum {
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Encnone,
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Encssl,
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Enctls,
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};
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void (*fcalls[])(Fsrpc*) =
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{
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[Tversion] Xversion,
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[Tauth] Xauth,
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[Tflush] Xflush,
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[Tattach] Xattach,
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[Twalk] Xwalk,
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[Topen] slave,
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[Tcreate] Xcreate,
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[Tclunk] Xclunk,
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[Tread] slave,
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[Twrite] slave,
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[Tremove] Xremove,
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[Tstat] Xstat,
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[Twstat] Xwstat,
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};
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/* accounting and debugging counters */
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int filecnt;
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int freecnt;
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int qidcnt;
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int qfreecnt;
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int ncollision;
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int srvfd = -1;
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int nonone = 1;
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char *filterp;
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char *ealgs = "rc4_256 sha1";
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char *aanfilter = "/bin/aan";
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int encproto = Encnone;
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int readonly;
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static void mksecret(char *, uchar *);
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static char *anstring = "tcp!*!0";
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char *netdir = "", *local = "", *remote = "";
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void filter(int, char *, char *);
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void
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usage(void)
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{
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fprint(2, "usage: %s [-adnsR] [-f dbgfile] [-m msize] [-r root] "
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"[-S srvfile] [-e 'crypt hash'] [-P exclusion-file] "
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"[-A announce-string] [-B address]\n", argv0);
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fatal("usage");
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}
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static void
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noteconn(int fd)
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{
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NetConnInfo *nci;
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nci = getnetconninfo(nil, fd);
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if(nci == nil)
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return;
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netdir = estrdup(nci->dir);
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local = estrdup(nci->lsys);
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remote = estrdup(nci->rsys);
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freenetconninfo(nci);
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}
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void
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main(int argc, char **argv)
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{
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char buf[ERRMAX], ebuf[ERRMAX], initial[4], *ini, *srvfdfile;
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char *dbfile, *srv, *na, *nsfile, *keyspec;
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int doauth, n, fd;
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AuthInfo *ai;
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Fsrpc *r;
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dbfile = "/tmp/exportdb";
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srv = nil;
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srvfd = -1;
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srvfdfile = nil;
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na = nil;
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nsfile = nil;
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keyspec = "";
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doauth = 0;
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ai = nil;
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ARGBEGIN{
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case 'a':
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doauth = 1;
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break;
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case 'd':
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dbg++;
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break;
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case 'e':
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ealgs = EARGF(usage());
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if(*ealgs == 0 || strcmp(ealgs, "clear") == 0)
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ealgs = nil;
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break;
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case 'f':
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dbfile = EARGF(usage());
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break;
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case 'k':
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keyspec = EARGF(usage());
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break;
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case 'm':
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messagesize = strtoul(EARGF(usage()), nil, 0);
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break;
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case 'n':
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nonone = 0;
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break;
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case 'r':
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srv = EARGF(usage());
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break;
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case 's':
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srv = "/";
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break;
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case 'A':
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anstring = EARGF(usage());
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break;
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case 'B':
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na = EARGF(usage());
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break;
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case 'F':
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/* accepted but ignored, for backwards compatibility */
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break;
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case 'N':
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nsfile = EARGF(usage());
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break;
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case 'P':
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patternfile = EARGF(usage());
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break;
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case 'R':
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readonly = 1;
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break;
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case 'S':
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if(srvfdfile != nil)
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usage();
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srvfdfile = EARGF(usage());
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break;
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default:
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usage();
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}ARGEND
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USED(argc, argv);
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if(na == nil && doauth){
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/*
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* We use p9any so we don't have to visit this code again, with the
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* cost that this code is incompatible with the old world, which
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* requires p9sk2. (The two differ in who talks first, so compatibility
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* is awkward.)
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*/
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ai = auth_proxy(0, auth_getkey, "proto=p9any role=server %s", keyspec);
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if(ai == nil)
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fatal("auth_proxy: %r");
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if(nonone && strcmp(ai->cuid, "none") == 0)
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fatal("exportfs by none disallowed");
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if(auth_chuid(ai, nsfile) < 0)
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fatal("auth_chuid: %r");
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putenv("service", "exportfs");
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}
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if(srvfdfile != nil){
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if((srvfd = open(srvfdfile, ORDWR)) < 0)
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fatal("open %s: %r", srvfdfile);
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}
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if(na != nil){
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if(srv == nil)
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fatal("-B requires -s");
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local = "me";
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remote = na;
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if((fd = dial(netmkaddr(na, 0, "importfs"), 0, 0, 0)) < 0)
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fatal("can't dial %s: %r", na);
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ai = auth_proxy(fd, auth_getkey, "proto=p9any role=client %s", keyspec);
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if(ai == nil)
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fatal("%r: %s", na);
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dup(fd, 0);
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dup(fd, 1);
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close(fd);
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}
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exclusions();
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if(dbg) {
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n = create(dbfile, OWRITE|OTRUNC, 0666);
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dup(n, DFD);
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close(n);
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}
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if(srvfd >= 0 && srv != nil){
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fprint(2, "exportfs: -S cannot be used with -r or -s\n");
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usage();
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}
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DEBUG(DFD, "exportfs: started\n");
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rfork(RFNOTEG|RFREND);
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if(messagesize == 0){
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messagesize = iounit(0);
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if(messagesize == 0)
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messagesize = 8192+IOHDRSZ;
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}
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fhash = emallocz(sizeof(Fid*)*FHASHSIZE);
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fmtinstall('F', fcallfmt);
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/*
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* Get tree to serve from network connection,
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* check we can get there and ack the connection
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*/
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if(srvfd != -1) {
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/* do nothing */
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}
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else if(srv != nil) {
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if(chdir(srv) < 0) {
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ebuf[0] = '\0';
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errstr(ebuf, sizeof ebuf);
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r = getsbuf();
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r->work.tag = NOTAG;
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r->work.fid = NOFID;
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r->work.type = Rerror;
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r->work.ename = ebuf;
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n = convS2M(&r->work, r->buf, messagesize);
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write(0, r->buf, n);
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DEBUG(DFD, "chdir(\"%s\"): %s\n", srv, ebuf);
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exits(ebuf);
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}
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DEBUG(DFD, "invoked as server for %s", srv);
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strncpy(buf, srv, sizeof buf);
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}
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else {
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noteconn(0);
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buf[0] = 0;
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n = read(0, buf, sizeof(buf)-1);
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if(n < 0) {
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errstr(buf, sizeof buf);
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fprint(0, "read(0): %s\n", buf);
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DEBUG(DFD, "read(0): %s\n", buf);
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exits(buf);
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}
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buf[n] = 0;
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if(chdir(buf) < 0) {
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errstr(ebuf, sizeof ebuf);
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fprint(0, "chdir(%d:\"%s\"): %s\n", n, buf, ebuf);
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DEBUG(DFD, "chdir(%d:\"%s\"): %s\n", n, buf, ebuf);
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exits(ebuf);
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}
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}
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DEBUG(DFD, "\niniting root\n");
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initroot();
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DEBUG(DFD, "exportfs: %s\n", buf);
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if(srv == nil && srvfd == -1 && write(0, "OK", 2) != 2)
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fatal("open ack write");
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ini = initial;
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n = readn(0, initial, sizeof(initial));
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if(n == 0)
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fatal(nil); /* port scan or spurious open/close on exported /srv file (unmount) */
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if(n < sizeof(initial))
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fatal("can't read initial string: %r");
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if(memcmp(ini, "impo", 4) == 0) {
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char buf[128], *p, *args[3];
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ini = nil;
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p = buf;
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for(;;){
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if((n = read(0, p, 1)) < 0)
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fatal("can't read impo arguments: %r");
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if(n == 0)
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fatal("connection closed while reading arguments");
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if(*p == '\n')
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*p = '\0';
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if(*p++ == '\0')
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break;
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if(p >= buf + sizeof(buf))
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fatal("import parameters too long");
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}
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if(tokenize(buf, args, nelem(args)) != 2)
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fatal("impo arguments invalid: impo%s...", buf);
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if(strcmp(args[0], "aan") == 0)
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filterp = aanfilter;
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else if(strcmp(args[0], "nofilter") != 0)
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fatal("import filter argument unsupported: %s", args[0]);
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if(strcmp(args[1], "ssl") == 0)
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encproto = Encssl;
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else if(strcmp(args[1], "tls") == 0)
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encproto = Enctls;
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else if(strcmp(args[1], "clear") != 0)
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fatal("import encryption proto unsupported: %s", args[1]);
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|
|
if(encproto == Enctls)
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fatal("%s: tls has not yet been implemented", argv[0]);
|
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}
|
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if(encproto != Encnone && ealgs != nil && ai != nil) {
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uchar key[16], digest[SHA1dlen];
|
|
char fromclientsecret[21];
|
|
char fromserversecret[21];
|
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int i;
|
|
|
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if(ai->nsecret < 8)
|
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fatal("secret too small for ssl");
|
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memmove(key+4, ai->secret, 8);
|
|
|
|
/* exchange random numbers */
|
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srand(truerand());
|
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for(i = 0; i < 4; i++)
|
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key[i+12] = rand();
|
|
|
|
if(ini != nil)
|
|
fatal("Protocol botch: old import");
|
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if(readn(0, key, 4) != 4)
|
|
fatal("can't read key part; %r");
|
|
|
|
if(write(0, key+12, 4) != 4)
|
|
fatal("can't write key part; %r");
|
|
|
|
/* scramble into two secrets */
|
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sha1(key, sizeof(key), digest, nil);
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mksecret(fromclientsecret, digest);
|
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mksecret(fromserversecret, digest+10);
|
|
|
|
if(filterp != nil)
|
|
filter(0, filterp, na);
|
|
|
|
switch(encproto) {
|
|
case Encssl:
|
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fd = pushssl(0, ealgs, fromserversecret, fromclientsecret, nil);
|
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if(fd < 0)
|
|
fatal("can't establish ssl connection: %r");
|
|
if(fd != 0){
|
|
dup(fd, 0);
|
|
close(fd);
|
|
}
|
|
break;
|
|
case Enctls:
|
|
default:
|
|
fatal("Unsupported encryption protocol");
|
|
}
|
|
}
|
|
else if(filterp != nil) {
|
|
if(ini != nil)
|
|
fatal("Protocol botch: don't know how to deal with this");
|
|
filter(0, filterp, na);
|
|
}
|
|
dup(0, 1);
|
|
|
|
if(ai != nil)
|
|
auth_freeAI(ai);
|
|
|
|
if(ini != nil){
|
|
r = getsbuf();
|
|
memmove(r->buf, ini, BIT32SZ);
|
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n = GBIT32(r->buf);
|
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if(n <= BIT32SZ || n > messagesize)
|
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fatal("bad length in 9P2000 message header");
|
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n -= BIT32SZ;
|
|
if(readn(0, r->buf+BIT32SZ, n) != n)
|
|
fatal(nil);
|
|
n += BIT32SZ;
|
|
goto Message;
|
|
}
|
|
|
|
/*
|
|
* Start serving file requests from the network
|
|
*/
|
|
for(;;) {
|
|
r = getsbuf();
|
|
while((n = read9pmsg(0, r->buf, messagesize)) == 0)
|
|
;
|
|
if(n <= 0)
|
|
fatal(nil);
|
|
Message:
|
|
if(convM2S(r->buf, n, &r->work) == 0)
|
|
fatal("convM2S format error");
|
|
|
|
DEBUG(DFD, "%F\n", &r->work);
|
|
(fcalls[r->work.type])(r);
|
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}
|
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}
|
|
|
|
void
|
|
reply(Fcall *r, Fcall *t, char *err)
|
|
{
|
|
uchar *data;
|
|
int n;
|
|
|
|
t->tag = r->tag;
|
|
t->fid = r->fid;
|
|
if(err != nil) {
|
|
t->type = Rerror;
|
|
t->ename = err;
|
|
}
|
|
else
|
|
t->type = r->type + 1;
|
|
|
|
DEBUG(DFD, "\t%F\n", t);
|
|
|
|
data = malloc(messagesize); /* not mallocz; no need to clear */
|
|
if(data == nil)
|
|
fatal(Enomem);
|
|
n = convS2M(t, data, messagesize);
|
|
if(write(0, data, n) != n){
|
|
/* not fatal, might have got a note due to flush */
|
|
fprint(2, "exportfs: short write in reply: %r\n");
|
|
}
|
|
free(data);
|
|
}
|
|
|
|
Fid *
|
|
getfid(int nr)
|
|
{
|
|
Fid *f;
|
|
|
|
for(f = fidhash(nr); f != nil; f = f->next)
|
|
if(f->nr == nr)
|
|
return f;
|
|
|
|
return nil;
|
|
}
|
|
|
|
int
|
|
freefid(int nr)
|
|
{
|
|
Fid *f, **l;
|
|
char buf[128];
|
|
|
|
l = &fidhash(nr);
|
|
for(f = *l; f != nil; f = f->next) {
|
|
if(f->nr == nr) {
|
|
if(f->mid) {
|
|
snprint(buf, sizeof(buf), "/mnt/exportfs/%d", f->mid);
|
|
unmount(0, buf);
|
|
psmap[f->mid] = 0;
|
|
}
|
|
if(f->f != nil) {
|
|
freefile(f->f);
|
|
f->f = nil;
|
|
}
|
|
if(f->dir != nil){
|
|
free(f->dir);
|
|
f->dir = nil;
|
|
}
|
|
*l = f->next;
|
|
f->next = fidfree;
|
|
fidfree = f;
|
|
return 1;
|
|
}
|
|
l = &f->next;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
Fid *
|
|
newfid(int nr)
|
|
{
|
|
Fid *new, **l;
|
|
int i;
|
|
|
|
l = &fidhash(nr);
|
|
for(new = *l; new != nil; new = new->next)
|
|
if(new->nr == nr)
|
|
return nil;
|
|
|
|
if(fidfree == nil) {
|
|
fidfree = emallocz(sizeof(Fid) * Fidchunk);
|
|
|
|
for(i = 0; i < Fidchunk-1; i++)
|
|
fidfree[i].next = &fidfree[i+1];
|
|
|
|
fidfree[Fidchunk-1].next = nil;
|
|
}
|
|
|
|
new = fidfree;
|
|
fidfree = new->next;
|
|
|
|
memset(new, 0, sizeof(Fid));
|
|
new->next = *l;
|
|
*l = new;
|
|
new->nr = nr;
|
|
new->fid = -1;
|
|
new->mid = 0;
|
|
|
|
return new;
|
|
}
|
|
|
|
static struct {
|
|
Lock;
|
|
Fsrpc *free;
|
|
|
|
/* statistics */
|
|
int nalloc;
|
|
int nfree;
|
|
} sbufalloc;
|
|
|
|
Fsrpc *
|
|
getsbuf(void)
|
|
{
|
|
Fsrpc *w;
|
|
|
|
lock(&sbufalloc);
|
|
w = sbufalloc.free;
|
|
if(w != nil){
|
|
sbufalloc.free = w->next;
|
|
w->next = nil;
|
|
sbufalloc.nfree--;
|
|
unlock(&sbufalloc);
|
|
} else {
|
|
sbufalloc.nalloc++;
|
|
unlock(&sbufalloc);
|
|
w = emallocz(sizeof(*w) + messagesize);
|
|
}
|
|
w->flushtag = NOTAG;
|
|
return w;
|
|
}
|
|
|
|
void
|
|
putsbuf(Fsrpc *w)
|
|
{
|
|
w->flushtag = NOTAG;
|
|
lock(&sbufalloc);
|
|
w->next = sbufalloc.free;
|
|
sbufalloc.free = w;
|
|
sbufalloc.nfree++;
|
|
unlock(&sbufalloc);
|
|
}
|
|
|
|
void
|
|
freefile(File *f)
|
|
{
|
|
File *parent, *child;
|
|
|
|
while(--f->ref == 0){
|
|
freecnt++;
|
|
DEBUG(DFD, "free %s\n", f->name);
|
|
/* delete from parent */
|
|
parent = f->parent;
|
|
if(parent->child == f)
|
|
parent->child = f->childlist;
|
|
else{
|
|
for(child = parent->child; child->childlist != f; child = child->childlist) {
|
|
if(child->childlist == nil)
|
|
fatal("bad child list");
|
|
}
|
|
child->childlist = f->childlist;
|
|
}
|
|
freeqid(f->qidt);
|
|
free(f->name);
|
|
free(f);
|
|
f = parent;
|
|
}
|
|
}
|
|
|
|
File *
|
|
file(File *parent, char *name)
|
|
{
|
|
Dir *dir;
|
|
char *path;
|
|
File *f;
|
|
|
|
DEBUG(DFD, "\tfile: 0x%p %s name %s\n", parent, parent->name, name);
|
|
|
|
path = makepath(parent, name);
|
|
if(patternfile != nil && excludefile(path)){
|
|
free(path);
|
|
return nil;
|
|
}
|
|
dir = dirstat(path);
|
|
free(path);
|
|
if(dir == nil)
|
|
return nil;
|
|
|
|
for(f = parent->child; f != nil; f = f->childlist)
|
|
if(strcmp(name, f->name) == 0)
|
|
break;
|
|
|
|
if(f == nil){
|
|
f = emallocz(sizeof(File));
|
|
f->name = estrdup(name);
|
|
|
|
f->parent = parent;
|
|
f->childlist = parent->child;
|
|
parent->child = f;
|
|
parent->ref++;
|
|
f->ref = 0;
|
|
filecnt++;
|
|
}
|
|
f->ref++;
|
|
f->qid.type = dir->qid.type;
|
|
f->qid.vers = dir->qid.vers;
|
|
f->qidt = uniqueqid(dir);
|
|
f->qid.path = f->qidt->uniqpath;
|
|
|
|
f->inval = 0;
|
|
|
|
free(dir);
|
|
|
|
return f;
|
|
}
|
|
|
|
void
|
|
initroot(void)
|
|
{
|
|
Dir *dir;
|
|
|
|
root = emallocz(sizeof(File));
|
|
root->name = estrdup(".");
|
|
|
|
dir = dirstat(root->name);
|
|
if(dir == nil)
|
|
fatal("root stat");
|
|
|
|
root->ref = 1;
|
|
root->qid.vers = dir->qid.vers;
|
|
root->qidt = uniqueqid(dir);
|
|
root->qid.path = root->qidt->uniqpath;
|
|
root->qid.type = QTDIR;
|
|
free(dir);
|
|
|
|
psmpt = emallocz(sizeof(File));
|
|
psmpt->name = estrdup("/");
|
|
|
|
dir = dirstat(psmpt->name);
|
|
if(dir == nil)
|
|
return;
|
|
|
|
psmpt->ref = 1;
|
|
psmpt->qid.vers = dir->qid.vers;
|
|
psmpt->qidt = uniqueqid(dir);
|
|
psmpt->qid.path = psmpt->qidt->uniqpath;
|
|
free(dir);
|
|
|
|
psmpt = file(psmpt, "mnt");
|
|
if(psmpt == nil)
|
|
return;
|
|
psmpt = file(psmpt, "exportfs");
|
|
}
|
|
|
|
char*
|
|
makepath(File *p, char *name)
|
|
{
|
|
int i, n;
|
|
char *c, *s, *path, *seg[256];
|
|
|
|
seg[0] = name;
|
|
n = strlen(name)+2;
|
|
for(i = 1; i < 256 && p; i++, p = p->parent){
|
|
seg[i] = p->name;
|
|
n += strlen(p->name)+1;
|
|
}
|
|
path = emallocz(n);
|
|
s = path;
|
|
|
|
while(i--) {
|
|
for(c = seg[i]; *c; c++)
|
|
*s++ = *c;
|
|
*s++ = '/';
|
|
}
|
|
while(s[-1] == '/')
|
|
s--;
|
|
*s = '\0';
|
|
|
|
return path;
|
|
}
|
|
|
|
int
|
|
qidhash(vlong path)
|
|
{
|
|
int h, n;
|
|
|
|
h = 0;
|
|
for(n=0; n<64; n+=Nqidbits){
|
|
h ^= path;
|
|
path >>= Nqidbits;
|
|
}
|
|
return h & (Nqidtab-1);
|
|
}
|
|
|
|
void
|
|
freeqid(Qidtab *q)
|
|
{
|
|
ulong h;
|
|
Qidtab *l;
|
|
|
|
if(--q->ref)
|
|
return;
|
|
qfreecnt++;
|
|
h = qidhash(q->path);
|
|
if(qidtab[h] == q)
|
|
qidtab[h] = q->next;
|
|
else{
|
|
for(l=qidtab[h]; l->next!=q; l=l->next)
|
|
if(l->next == nil)
|
|
fatal("bad qid list");
|
|
l->next = q->next;
|
|
}
|
|
free(q);
|
|
}
|
|
|
|
Qidtab*
|
|
qidlookup(Dir *d)
|
|
{
|
|
ulong h;
|
|
Qidtab *q;
|
|
|
|
h = qidhash(d->qid.path);
|
|
for(q=qidtab[h]; q!=nil; q=q->next)
|
|
if(q->type==d->type && q->dev==d->dev && q->path==d->qid.path)
|
|
return q;
|
|
return nil;
|
|
}
|
|
|
|
int
|
|
qidexists(vlong path)
|
|
{
|
|
int h;
|
|
Qidtab *q;
|
|
|
|
for(h=0; h<Nqidtab; h++)
|
|
for(q=qidtab[h]; q!=nil; q=q->next)
|
|
if(q->uniqpath == path)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
Qidtab*
|
|
uniqueqid(Dir *d)
|
|
{
|
|
ulong h;
|
|
vlong path;
|
|
Qidtab *q;
|
|
|
|
q = qidlookup(d);
|
|
if(q != nil){
|
|
q->ref++;
|
|
return q;
|
|
}
|
|
path = d->qid.path;
|
|
while(qidexists(path)){
|
|
DEBUG(DFD, "collision on %s\n", d->name);
|
|
/* collision: find a new one */
|
|
ncollision++;
|
|
path &= QIDPATH;
|
|
++newqid;
|
|
if(newqid >= (1<<16)){
|
|
DEBUG(DFD, "collision wraparound\n");
|
|
newqid = 1;
|
|
}
|
|
path |= newqid<<48;
|
|
DEBUG(DFD, "assign qid %.16llux\n", path);
|
|
}
|
|
qidcnt++;
|
|
q = emallocz(sizeof(Qidtab));
|
|
q->ref = 1;
|
|
q->type = d->type;
|
|
q->dev = d->dev;
|
|
q->path = d->qid.path;
|
|
q->uniqpath = path;
|
|
h = qidhash(d->qid.path);
|
|
q->next = qidtab[h];
|
|
qidtab[h] = q;
|
|
return q;
|
|
}
|
|
|
|
void
|
|
fatal(char *s, ...)
|
|
{
|
|
char buf[ERRMAX];
|
|
va_list arg;
|
|
Proc *m;
|
|
|
|
if(s != nil) {
|
|
va_start(arg, s);
|
|
vsnprint(buf, ERRMAX, s, arg);
|
|
va_end(arg);
|
|
}
|
|
|
|
/* Clear away the slave children */
|
|
for(m = Proclist; m != nil; m = m->next)
|
|
postnote(PNPROC, m->pid, "kill");
|
|
|
|
if(s != nil) {
|
|
DEBUG(DFD, "%s\n", buf);
|
|
sysfatal("%s", buf); /* caution: buf could contain '%' */
|
|
} else
|
|
exits(nil);
|
|
}
|
|
|
|
void*
|
|
emallocz(uint n)
|
|
{
|
|
void *p;
|
|
|
|
p = mallocz(n, 1);
|
|
if(p == nil)
|
|
fatal(Enomem);
|
|
setmalloctag(p, getcallerpc(&n));
|
|
return p;
|
|
}
|
|
|
|
char*
|
|
estrdup(char *s)
|
|
{
|
|
char *t;
|
|
|
|
t = strdup(s);
|
|
if(t == nil)
|
|
fatal(Enomem);
|
|
setmalloctag(t, getcallerpc(&s));
|
|
return t;
|
|
}
|
|
|
|
void
|
|
filter(int fd, char *cmd, char *host)
|
|
{
|
|
char addr[128], buf[256], *s, *file, *argv[16];
|
|
int lfd, p[2], len, argc;
|
|
|
|
if(host == nil){
|
|
/* Get a free port and post it to the client. */
|
|
if (announce(anstring, addr) < 0)
|
|
fatal("filter: Cannot announce %s: %r", anstring);
|
|
|
|
snprint(buf, sizeof(buf), "%s/local", addr);
|
|
if ((lfd = open(buf, OREAD)) < 0)
|
|
fatal("filter: Cannot open %s: %r", buf);
|
|
if ((len = read(lfd, buf, sizeof buf - 1)) < 0)
|
|
fatal("filter: Cannot read %s: %r", buf);
|
|
close(lfd);
|
|
buf[len] = '\0';
|
|
if ((s = strchr(buf, '\n')) != nil)
|
|
len = s - buf;
|
|
if (write(fd, buf, len) != len)
|
|
fatal("filter: cannot write port; %r");
|
|
} else {
|
|
/* Read address string from connection */
|
|
if ((len = read(fd, buf, sizeof buf - 1)) < 0)
|
|
sysfatal("filter: cannot write port; %r");
|
|
buf[len] = '\0';
|
|
|
|
if ((s = strrchr(buf, '!')) == nil)
|
|
sysfatal("filter: illegally formatted port %s", buf);
|
|
strecpy(addr, addr+sizeof(addr), netmkaddr(host, "tcp", s+1));
|
|
strecpy(strrchr(addr, '!'), addr+sizeof(addr), s);
|
|
}
|
|
|
|
DEBUG(DFD, "filter: %s\n", addr);
|
|
|
|
snprint(buf, sizeof(buf), "%s", cmd);
|
|
argc = tokenize(buf, argv, nelem(argv)-3);
|
|
if (argc == 0)
|
|
sysfatal("filter: empty command");
|
|
|
|
if(host != nil)
|
|
argv[argc++] = "-c";
|
|
argv[argc++] = addr;
|
|
argv[argc] = nil;
|
|
|
|
file = argv[0];
|
|
if((s = strrchr(argv[0], '/')) != nil)
|
|
argv[0] = s+1;
|
|
|
|
if(pipe(p) < 0)
|
|
sysfatal("pipe: %r");
|
|
|
|
switch(rfork(RFNOWAIT|RFPROC|RFMEM|RFFDG|RFREND)) {
|
|
case -1:
|
|
fatal("filter: rfork; %r\n");
|
|
case 0:
|
|
close(fd);
|
|
if (dup(p[0], 1) < 0)
|
|
fatal("filter: Cannot dup to 1; %r");
|
|
if (dup(p[0], 0) < 0)
|
|
fatal("filter: Cannot dup to 0; %r");
|
|
close(p[0]);
|
|
close(p[1]);
|
|
exec(file, argv);
|
|
fatal("filter: exec; %r");
|
|
default:
|
|
dup(p[1], fd);
|
|
close(p[0]);
|
|
close(p[1]);
|
|
}
|
|
}
|
|
|
|
static void
|
|
mksecret(char *t, uchar *f)
|
|
{
|
|
sprint(t, "%2.2ux%2.2ux%2.2ux%2.2ux%2.2ux%2.2ux%2.2ux%2.2ux%2.2ux%2.2ux",
|
|
f[0], f[1], f[2], f[3], f[4], f[5], f[6], f[7], f[8], f[9]);
|
|
}
|