2 * userv service (or standalone program) for per-user IP subranges.
4 * When invoked appropriately, it creates a point-to-point network
5 * interface with specified parameters. It arranges for packets sent out
6 * via that interface by the kernel to appear on its own stdout in SLIP or
7 * CSLIP encoding, and packets injected into its own stdin to be given to
8 * the kernel as if received on that interface. Optionally, additional
9 * routes can be set up to arrange for traffic for other address ranges to
10 * be routed through the new interface.
12 * This is the service program, which is invoked as root from userv (or may
13 * be invoked firectly).
15 * Its arguments are supposed to be, in order, as follows:
17 * The first two arguments are usually supplied by the userv
18 * configuration. See the file `ipif/ipif' in the source tree, which
19 * is installed in /etc/userv/services.d/ipif by `make install':
23 * Specifies address ranges and gids which own them. The default
24 * configuration supplies /etc/userv/ipif-networks, which is then read
25 * for a list of entries, one per line.
28 * Serves to separate the user-supplied and therefore untrusted
29 * arguments from the trusted first argument.
31 * The remaining arguments are supplied by the (untrusted) caller:
33 * <local-addr>,<peer-addr>,<mtu>,<proto>
35 * As for slattach. The only supported protocol is slip.
36 * Alternatively, set to `debug' to print debugging info and
37 * exit. <local-addr> is address of the interface to be created
38 * on the local system; <peer-addr> is the address of the
39 * point-to-point peer. They must be actual addresses (not
42 * <prefix>/<mask>,<prefix>/<mask>,...
44 * List of additional routes to add for this interface. routes will
45 * be set up on the local system arranging for packets for those
46 * networks to be sent via the created interface. <prefix> must be an
47 * IPv4 address, and mask must be an integer (dotted-quad masks are
48 * not supported). If no additional routes are to be set up, use `-'
49 * or supply an empty argument.
51 * Each <config> item - whether a line in a file such as
52 * /etc/userv/ipif-networks, or the single trusted argument supplied
53 * on the service program command line - is one of:
56 * ./<config-file-name>
57 * ../<config-file-name>
59 * Reads a file which contains lines which are each <config>
62 * <gid>,[=][-|+]<prefix>/<len>(-|+<prefix>/<len>...)[,<junk>]
64 * Indicates that <gid> may allocate addresses in the relevant address
65 * range (<junk> is ignored). <gid> must be numeric. To specify a
66 * single host address, you must specify a mask of /32. If `=' is
67 * specified then the specific subrange is only allowed for the local
68 * endpoint address, but not for remote addresses.
70 * More than one range may be given, with each range prefixed
71 * by + or -. In this case each address range in the rule will
72 * scanned in order, and the first range in the rule that matches
73 * any desired rule will count: if that first matching range is
74 * prefixed by `+' (or nothing) then the rule applies, if it
75 * is prefixed by `-' (or nothing matches), the rule does not.
78 * Means that anything is to be permitted. This should not appear in
79 * /etc/userv/ipif-networks, as that would permit any user on the
80 * system to create any interfaces with any addresses and routes
81 * attached. It is provided so that root can usefully invoke the ipif
82 * service program directly (not via userv), without needing to set up
83 * permissions in /etc/userv/ipif-networks.
87 * Comment. Blank lines are also ignored.
89 * NB: Permission is granted if _any_ config entry matches the request.
91 * The service program should be run from userv with no-disconnect-hup.
94 * This file is part of ipif, part of userv-utils
96 * Copyright 1996-2013 Ian Jackson <ijackson@chiark.greenend.org.uk>
97 * Copyright 1998 David Damerell <damerell@chiark.greenend.org.uk>
99 * Chancellor Masters and Scholars of the University of Cambridge
100 * Copyright 2010 Tony Finch <fanf@dotat.at>
102 * This is free software; you can redistribute it and/or modify it
103 * under the terms of the GNU General Public License as published by
104 * the Free Software Foundation; either version 3 of the License, or
105 * (at your option) any later version.
107 * This program is distributed in the hope that it will be useful, but
108 * WITHOUT ANY WARRANTY; without even the implied warranty of
109 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
110 * General Public License for more details.
112 * You should have received a copy of the GNU General Public License
113 * along with userv-utils; if not, see http://www.gnu.org/licenses/.
129 #include <sys/types.h>
130 #include <sys/wait.h>
131 #include <sys/stat.h>
133 #include <sys/types.h>
134 #include <sys/ioctl.h>
135 #include <sys/socket.h>
137 #include <sys/stat.h>
140 #include <linux/if.h>
141 #include <linux/if_tun.h>
144 #define MAXEXROUTES 50
147 static const unsigned long gidmaxval= (unsigned long)((gid_t)-2);
148 static const char *const protos_ok[]= { "slip", 0 };
149 static const int signals[]= { SIGHUP, SIGINT, SIGTERM, 0 };
151 static const char *configstr, *proto;
152 static unsigned long localaddr, peeraddr, mtu;
153 static int localpming, peerpming;
154 static int localallow, peerallow, allallow;
155 static int nexroutes;
156 static struct exroute {
157 unsigned long prefix, mask;
159 char prefixtxt[ATXTLEN], masktxt[ATXTLEN];
160 } exroutes[MAXEXROUTES];
162 static char localtxt[ATXTLEN];
163 static char peertxt[ATXTLEN];
165 static struct pplace {
166 struct pplace *parent;
167 const char *filename;
176 static void terminate(int estatus) {
181 static void fatal(const char *fmt, ...)
182 __attribute__((format(printf,1,2)));
183 static void fatal(const char *fmt, ...) {
187 fputs("userv-ipif service: fatal error: ",stderr);
188 vfprintf(stderr, fmt, al);
193 static void sysfatal(const char *fmt, ...)
194 __attribute__((format(printf,1,2)));
195 static void sysfatal(const char *fmt, ...) {
202 fputs("userv-ipif service: fatal system error: ",stderr);
203 vfprintf(stderr, fmt, al);
204 fprintf(stderr,": %s\n", strerror(e));
209 static void badusage(const char *fmt, ...)
210 __attribute__((format(printf,1,2)));
211 static void badusage(const char *fmt, ...) {
217 "userv-ipif service: %s:%d: ",
218 cpplace->filename, cpplace->lineno);
220 fputs("userv-ipif service: invalid usage: ",stderr);
223 vfprintf(stderr, fmt, al);
227 for (cpp=cpplace->parent; cpp; cpp=cpp->parent) {
229 "userv-ipif service: %s:%d: ... in file included from here\n",
230 cpp->filename, cpp->lineno);
236 static char *ip2txt(unsigned long addr, char *buf) {
237 sprintf(buf, "%lu.%lu.%lu.%lu",
245 static unsigned long eat_number(const char **argp, const char *what,
246 unsigned long min, unsigned long max,
247 const char *endchars, int *endchar_r) {
248 /* If !endchars then the endchar must be a nul, otherwise it may be
249 * a nul (resulting in *argp set to 0) or something else (*argp set
250 * to point to after delim, *endchar_r set to delim).
251 * *endchar_r may be 0.
257 if (!*argp) { badusage("missing number %s",what); }
258 rv= strtoul(*argp,&ep,0);
259 if ((endchar= *ep)) {
260 if (!endchars) badusage("junk after number %s",what);
261 if (!strchr(endchars,endchar))
262 badusage("invalid character or delimiter `%c' in or after number, %s:"
263 " expected %s (or none?)", endchar,what,endchars);
268 if (endchar_r) *endchar_r= endchar;
269 if (rv < min || rv > max) badusage("number %s value %lu out of range %lu..%lu",
274 static int addrnet_overlap(unsigned long p1, unsigned long m1,
275 unsigned long p2, unsigned long m2) {
279 return (p1 & mask) == (p2 & mask);
282 static void addrnet_mustdiffer(const char *w1, unsigned long p1, unsigned long m1,
283 const char *w2, unsigned long p2, unsigned long m2) {
284 if (!addrnet_overlap(p1,m1,p2,m2)) return;
285 badusage("%s %08lx/%08lx overlaps/clashes with %s %08lx/%08lx",
289 static unsigned long eat_addr(const char **argp, const char *what,
290 const char *endchars, int *endchar_r) {
299 sprintf(whatbuf,"%s byte #%d",what,i);
300 rv |= eat_number(argp,whatbuf, 0,255, i<3 ? "." : endchars, endchar_r);
306 static void eat_prefixmask(const char **argp, const char *what,
307 const char *endchars, int *endchar_r,
308 unsigned long *prefix_r, unsigned long *mask_r, int *len_r) {
309 /* mask_r and len_r may be 0 */
312 unsigned long prefix, mask;
314 prefix= eat_addr(argp,what, "/",0);
315 sprintf(whatbuf,"%s length",what);
316 len= eat_number(argp,whatbuf, 0,32, endchars,endchar_r);
318 mask= len ? (~0UL << (32-len)) : 0UL;
319 if (prefix & ~mask) badusage("%s prefix %08lx not fully contained in mask %08lx",
322 if (mask_r) *mask_r= mask;
323 if (len_r) *len_r= len;
326 static int addrnet_isin(unsigned long prefix, unsigned long mask,
327 unsigned long mprefix, unsigned long mmask) {
328 return !(~mask & mmask) && (prefix & mmask) == mprefix;
331 /* Totally hideous algorithm for parsing the config file lines.
332 * For each config file line, we first see if its gid applies. If not
333 * we skip it. Otherwise, we do
335 * which sets <foo>pming to 1
336 * for each range. <foo>pming may be 0 if we've determined that
337 * this line does not apply to <foo>.
339 * which calls permit_range_thing for each <foo>
340 * which checks to see if <foo> is inside the relevant
341 * range (for +) or overlaps it (for -) and updates
342 * <foo>allow and <foo>pming.
345 static void permit_begin(void) {
348 localpming= peerpming= 1;
349 for (i=0; i<nexroutes; i++) exroutes[i].pming= 1;
352 static void permit_range_thing(unsigned long tprefix, unsigned long tmask,
353 const char *what, int *tallow, int *tpming,
354 unsigned long pprefix, unsigned long pmask,
355 int plus, int *any) {
357 if (!addrnet_isin(tprefix,tmask, pprefix,pmask)) return;
358 if (*tpming) *tallow= 1;
360 if (!addrnet_overlap(tprefix,tmask, pprefix,pmask)) return;
363 if (!proto) printf(" %c%s", plus?'+':'-', what);
367 static void permit_range(unsigned long prefix, unsigned long mask,
368 int plus, int localonly) {
372 assert(!(prefix & ~mask));
375 permit_range_thing(localaddr,~0UL,"local", &localallow,&localpming,
376 prefix,mask, plus,&any);
379 permit_range_thing(peeraddr,~0UL, "peer-addr", &peerallow,&peerpming,
380 prefix,mask, plus,&any);
381 for (i=0; i<nexroutes; i++) {
382 sprintf(idbuf,"route#%d",i);
383 permit_range_thing(exroutes[i].prefix,exroutes[i].mask, idbuf,
384 &exroutes[i].allow,&exroutes[i].pming,
385 prefix,mask, plus,&any);
389 if (!any) fputs(" nothing",stdout);
392 static void pconfig(const char *configstr, int truncated);
394 static void pfile(const char *filename) {
398 struct pplace npp, *cpp;
400 for (cpp=cpplace; cpp; cpp=cpp->parent) {
401 if (!strcmp(cpp->filename,filename))
402 badusage("recursive configuration file `%s'",filename);
405 file= fopen(filename,"r");
407 badusage("cannot open configuration file `%s': %s", filename, strerror(errno));
409 if (!proto) printf("config file `%s':\n",filename);
412 npp.filename= filename;
416 while (fgets(buf, sizeof(buf), file)) {
421 truncated= (buf[l-1] != '\n');
422 while (l>0 && isspace((unsigned char) buf[l-1])) l--;
427 while ((c= getc(file)) != EOF && c != '\n');
431 pconfig(buf,truncated);
434 badusage("failed while reading configuration file: %s", strerror(errno));
439 static void pconfig(const char *configstr, int truncated) {
440 unsigned long fgid, tgid, pprefix, pmask;
441 int plen, localonly, plus, rangeix, delim;
446 switch (configstr[0]) {
449 permit_range(0UL,0UL,1,0);
456 if (truncated) badusage("filename too long (`%.100s...')",configstr);
461 if (!isdigit((unsigned char)configstr[0]))
462 badusage("unknown configuration directive");
464 fgid= eat_number(&configstr,"gid", 0,gidmaxval, ",",0);
466 if (!proto) printf(" %5lu", fgid);
468 gidlist= getenv("USERV_GID");
469 if (!gidlist) fatal("USERV_GID not set");
472 if (!proto) printf(" no matching gid\n");
475 tgid= eat_number(&gidlist,"userv-gid", 0,gidmaxval, " ",0);
476 if (tgid == fgid) break;
479 if (configstr[0] == '=') {
490 switch (configstr[0]) {
491 case '-': plus= 0; /* fall through */
492 case '+': configstr++;
497 sprintf(whattxt, "%s-prefix#%d",
498 plus ? "permitted" : "notpermitted",
500 eat_prefixmask(&configstr,whattxt, ",+-",&delim,
501 &pprefix,&pmask,&plen);
502 if (!configstr && truncated)
503 badusage("gid,prefix/len,... spec too long");
506 printf(" %c%s/%d:", plus?'+':'-',ip2txt(pprefix,ptxt), plen);
508 permit_range(pprefix,pmask,plus,localonly);
509 if (delim==',') break;
511 plus= delim=='-' ? 0 : 1;
520 static void checkallow(int allow, const char *what,
521 const char *prefixtxt, const char *masktxt) {
523 fprintf(stderr,"userv-ipif service: access denied for %s, %s/%s\n",
524 what, prefixtxt, masktxt);
528 static void parseargs(int argc, const char *const *argv) {
529 unsigned long routeaddr, routemask;
531 const char *const *cprotop;
533 char erwhatbuf[100], erwhatbuf2[100];
535 if (argc < NARGS+1) { badusage("too few arguments"); }
536 if (argc > NARGS+1) { badusage("too many arguments"); }
541 if (strcmp(carg,"--")) badusage("separator argument `--' not found, got `%s'",carg);
544 localaddr= eat_addr(&carg,"local-addr", ",",0);
545 peeraddr= eat_addr(&carg,"peer-addr", ",",0);
546 mtu= eat_number(&carg,"mtu", 576,65536, ",",0);
547 localallow= peerallow= 0;
549 if (!strcmp(carg,"debug")) {
552 for (cprotop= protos_ok;
553 (proto= *cprotop) && strcmp(proto,carg);
555 if (!proto) fatal("invalid protocol");
558 addrnet_mustdiffer("local-addr",localaddr,~0UL, "peer-addr",peeraddr,~0UL);
561 if (strcmp(carg,"-")) {
565 if (nexroutes == MAXEXROUTES)
566 fatal("too many extra routes (only %d allowed)",MAXEXROUTES);
567 sprintf(erwhatbuf,"route#%d",nexroutes);
569 eat_prefixmask(&carg,erwhatbuf, ",",0, &routeaddr,&routemask,0);
570 if (routemask == ~0UL) {
571 addrnet_mustdiffer(erwhatbuf,routeaddr,routemask, "local-addr",localaddr,~0UL);
572 addrnet_mustdiffer(erwhatbuf,routeaddr,routemask, "peer-addr",peeraddr,~0UL);
574 for (i=0; i<nexroutes; i++) {
575 sprintf(erwhatbuf2,"route#%d",i);
576 addrnet_mustdiffer(erwhatbuf,routeaddr,routemask,
577 erwhatbuf2,exroutes[i].prefix,exroutes[i].mask);
579 exroutes[nexroutes].prefix= routeaddr;
580 exroutes[nexroutes].mask= routemask;
581 exroutes[nexroutes].allow= 0;
582 ip2txt(routeaddr,exroutes[nexroutes].prefixtxt);
583 ip2txt(routemask,exroutes[nexroutes].masktxt);
587 ip2txt(localaddr,localtxt);
588 ip2txt(peeraddr,peertxt);
591 static void checkpermit(void) {
596 checkallow(localallow,"local-addr", localtxt,"32");
597 checkallow(peerallow,"peer-addr", peertxt,"32");
598 for (i=0; i<nexroutes; i++) {
599 sprintf(erwhatbuf, "route#%d", i);
600 checkallow(exroutes[i].allow, erwhatbuf, exroutes[i].prefixtxt, exroutes[i].masktxt);
602 if (!allallow) fatal("access denied");
605 static void dumpdebug(void) __attribute__((noreturn));
606 static void dumpdebug(void) {
610 printf("protocol: debug\n"
611 "local: %08lx == %s\n"
612 "peer: %08lx == %s\n"
619 for (i=0; i<nexroutes; i++) {
620 sprintf(erwhatbuf, "route#%d:", i);
621 printf("%-9s %08lx/%08lx == %s/%s\n",
623 exroutes[i].prefix, exroutes[i].mask,
624 exroutes[i].prefixtxt, exroutes[i].masktxt);
626 if (ferror(stdout) || fclose(stdout)) sysfatal("flush stdout");
631 static int task(const char *desc) {
636 if (pid == (pid_t)-1) sysfatal("fork for task");
640 pidr= waitpid(pid,&status,0);
641 if (pidr!=(pid_t)-1) break;
642 if (errno==EINTR) continue;
643 sysfatal("waitpid for task");
647 if (WIFEXITED(status)) {
648 if (WEXITSTATUS(status))
649 fatal("userv-ipif service: %s exited with error exit status %d\n",
650 desc, WEXITSTATUS(status));
651 } else if (WIFSIGNALED(status)) {
652 fatal("userv-ipif service: %s died due to signal %s%s\n",
653 desc, strsignal(WTERMSIG(status)),
654 WCOREDUMP(status) ? " (core dumped)" : "");
656 fatal("userv-ipif service: %s unexpectedly terminated"
657 " with unknown status code %d\n", desc, status);
663 static void createif(void) {
664 static const char ifnamepat[]= "userv%d";
668 memset(&ifr,0,sizeof(ifr));
669 ifr.ifr_flags= IFF_TUN | IFF_NO_PI;
671 assert(sizeof(ifr.ifr_name) >= sizeof(ifnamepat));
672 strcpy(ifr.ifr_name, ifnamepat);
674 tunfd= open("/dev/net/tun", O_RDWR);
675 if (!tunfd) sysfatal("open /dev/net/tun");
677 r= fcntl(tunfd, F_GETFD);
678 if (r==-1) sysfatal("fcntl(tunfd,F_GETFD)");
679 r= fcntl(tunfd, F_SETFD, r|FD_CLOEXEC);
680 if (r==-1) sysfatal("fcntl(tunfd,F_SETFD,|FD_CLOEXEC)");
682 r= ioctl(tunfd, TUNSETIFF, (void*)&ifr);
683 if (r) sysfatal("ioctl TUNSETIFF");
685 /* ifr.ifr_name might not be null-terminated. crazy abi. */
686 ifname= malloc(sizeof(ifr.ifr_name)+1);
687 if (!ifname) sysfatal("malloc for interface name");
688 memcpy(ifname, ifr.ifr_name, sizeof(ifr.ifr_name));
689 ifname[sizeof(ifr.ifr_name)]= 0;
692 static void netconfigure(void) {
696 if (task("ifconfig")) {
697 sprintf(mtutxt,"%lu",mtu);
699 execlp("ifconfig", "ifconfig", ifname, localtxt,
700 "netmask","255.255.255.255", "pointopoint",peertxt, "-broadcast",
701 "mtu",mtutxt, "up", (char*)0);
702 sysfatal("cannot exec ifconfig");
705 for (i=0; i<nexroutes; i++) {
707 execlp("route","route", "add", "-net",exroutes[i].prefixtxt,
708 "netmask",exroutes[i].masktxt,
709 "gw",peertxt, "dev",ifname, (char*)0);
710 sysfatal("cannot exec route (for route)");
715 static void setnonblock(int fd) {
717 r= fcntl(fd,F_GETFL);
718 if (r==-1) sysfatal("fcntl F_GETFL");
719 r= fcntl(fd,F_SETFL, r|O_NONBLOCK);
720 if (r==-1) sysfatal("fcntl F_SETFL O_NONBLOCK");
723 static void rx_packet(const uint8_t *packet, int len) {
727 int r= write(tunfd, packet, len);
729 if (errno==EINTR) continue;
730 if (errno==EAGAIN || errno==ENOMEM) return; /* oh well */
731 sysfatal("error writing packet to tun (transmitting)");
738 static int output_waiting, input_waiting;
740 #define SLIP_END 0300
741 #define SLIP_ESC 0333
742 #define SLIP_ESC_END 0334
743 #define SLIP_ESC_ESC 0335
745 static void more_rx_data(uint8_t *input_buf, uint8_t *output_buf) {
746 /* we make slip_data never contain continuation of a packet */
747 /* input_buf is passed as a parameter since it's in copydata's stack frame */
749 static int output_len;
751 uint8_t *op= output_buf + output_len;
752 const uint8_t *ip= input_buf + scanned;
753 const uint8_t *ip_end= input_buf + input_waiting;
757 if (ip>=ip_end) break;
760 rx_packet(output_buf, op-output_buf);
762 eaten= ip - input_buf;
766 if (ip>=ip_end) { /* rescan this when there's more */ ip--; break; }
768 if (c==SLIP_ESC_END) c=SLIP_END;
769 else if (c==SLIP_ESC_ESC) c=SLIP_ESC;
770 else fatal("unexpected byte 0%o after SLIP_ESC",c);
772 if (op == output_buf+mtu)
773 fatal("SLIP packet exceeds mtu");
777 output_len= op - output_buf;
778 scanned= ip - input_buf;
780 input_waiting -= eaten;
781 memmove(input_buf, input_buf+eaten, input_waiting);
785 static void tx_packet(uint8_t *output_buf, const uint8_t *ip, int inlen) {
786 /* output_buf is passed as a parameter since it's in copydata's stack frame */
787 assert(!output_waiting);
788 uint8_t *op= output_buf;
793 if (c==SLIP_END) { *op++= SLIP_ESC; *op++= SLIP_ESC_END; }
794 else if (c==SLIP_ESC) { *op++= SLIP_ESC; *op++= SLIP_ESC_ESC; }
798 assert(op <= output_buf + mtu*2+2);
800 output_waiting= op - output_buf;
803 static void copydata(void) __attribute__((noreturn));
804 static void copydata(void) {
805 uint8_t output_buf[mtu*2+2];
806 uint8_t input_buf[mtu*2+2];
807 uint8_t rx_packet_buf[mtu];
811 struct pollfd polls[3];
812 memset(polls, 0, sizeof(polls));
814 polls[0].fd= 0; polls[0].events= POLLIN;
818 /* We don't do flow control on input packets; instead, we just throw
819 * away ones which the kernel doesn't accept. So we always poll for
822 * Output packets we buffer, so we poll only as appropriate for those.
825 /* Start by transmitting one END byte to say we're ready. */
826 output_buf[0]= SLIP_END;
830 if (output_waiting) {
831 r= write(1, output_buf, output_waiting);
833 if (errno==EINTR) continue;
835 sysfatal("error writing SLIP output (packets being received)");
839 memmove(output_buf, output_buf+r, output_waiting);
842 if (output_waiting) {
843 polls[1].events |= POLLOUT;
844 polls[2].events &= ~POLLIN;
846 polls[1].events &= ~POLLOUT;
847 polls[2].events |= POLLIN;
852 if (errno==EINTR) continue;
853 sysfatal("poll() failed");
855 assert(r>0); /* we used an infinite timeout */
857 for (i=0; i<sizeof(polls)/sizeof(polls[0]); i++)
858 if (polls[i].revents & ~polls[i].events)
859 fatal("unexpected revents 0x%x for fd=%d",
860 polls[i].revents, polls[i].fd);
862 if (polls[0].events & POLLIN) {
863 int want= sizeof(input_buf) - input_waiting;
864 if (want<0) fatal("incoming packet necessarily exceeds MTU");
865 r= read(0, input_buf + input_waiting, want);
868 assert(input_waiting <= sizeof(input_buf));
869 more_rx_data(input_buf, rx_packet_buf);
873 if (!(errno==EINTR || errno==EAGAIN))
874 sysfatal("error reading input SLIP data (packets to transmit)");
878 /* We handle what would be (polls[1].events & POLLOUT) above,
879 * unconditionally. That eliminates the need to poll in the usual case */
881 if (polls[2].events & POLLIN) {
882 uint8_t packet_buf[mtu];
883 r= read(tunfd, packet_buf, mtu);
885 tx_packet(output_buf, packet_buf, r);
888 if (!(errno==EAGAIN || errno==EWOULDBLOCK))
889 sysfatal("error reading packet (being transmitted) from tun");
895 int main(int argc, const char *const *argv) {
896 parseargs(argc,argv);
897 pconfig(configstr,0);
899 if (!proto) dumpdebug();