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/*
* adh-main.c
* - useful general-purpose resolver client program
* main program and useful subroutines
*/
/*
* This file is
* Copyright (C) 1997-1999 Ian Jackson <ian@davenant.greenend.org.uk>
*
* It is part of adns, which is
* Copyright (C) 1997-1999 Ian Jackson <ian@davenant.greenend.org.uk>
* Copyright (C) 1999 Tony Finch <dot@dotat.at>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "adnshost.h"
void sysfail(const char *what, int errnoval) {
fprintf(stderr,"adnshost failed: %s: %s\n",what,strerror(errnoval));
exit(10);
}
void usageerr(const char *fmt, ...) {
va_list al;
fputs("adnshost usage error: ",stderr);
va_start(al,fmt);
vfprintf(stderr,fmt,al);
va_end(al);
putc('\n',stderr);
exit(11);
}
void outerr(void) {
sysfail("write to stdout",errno);
}
void *xmalloc(size_t sz) {
void *p;
p= malloc(sz); if (!p) sysfail("malloc",sz);
return p;
}
char *xstrsave(const char *str) {
char *p;
p= xmalloc(strlen(str)+1);
strcpy(p,str);
return p;
}
void of_type(const struct optioninfo *oi, const char *arg) {
static const struct typename {
adns_rrtype type;
const char *desc;
} typenames[]= {
/* enhanced versions */
{ adns_r_ns, "ns" },
{ adns_r_soa, "soa" },
{ adns_r_ptr, "ptr" },
{ adns_r_mx, "mx" },
{ adns_r_rp, "rp" },
{ adns_r_addr, "addr" },
/* types with only one version */
{ adns_r_cname, "cname" },
{ adns_r_hinfo, "hinfo" },
{ adns_r_txt, "txt" },
/* raw versions */
{ adns_r_a, "a" },
{ adns_r_ns_raw, "ns-" },
{ adns_r_soa_raw, "soa-" },
{ adns_r_ptr_raw, "ptr-" },
{ adns_r_mx_raw, "mx-" },
{ adns_r_rp_raw, "rp-" },
{ adns_r_none, 0 }
};
const struct typename *tnp;
for (tnp=typenames;
tnp->type && strcmp(arg,tnp->desc);
tnp++);
if (!tnp->type) usageerr("unknown RR type %s",arg);
ov_type= tnp->type;
}
int rcode;
static void process_optarg(const char *arg,
const char *const **argv_p,
const char *value) {
const struct optioninfo *oip;
int invert;
if (arg[0] == '-' || arg[0] == '+') {
if (arg[0] == '-' && arg[1] == '-') {
if (!strncmp(arg,"--no-",5)) {
invert= 1;
oip= opt_findl(arg+5);
} else {
invert= 0;
oip= opt_findl(arg+2);
}
if (oip->type == ot_funcarg) {
arg= argv_p ? *++(*argv_p) : value;
if (!arg) usageerr("option --%s requires a value argument",oip->lopt);
} else {
if (value) usageerr("option --%s does not take a value",oip->lopt);
arg= 0;
}
opt_do(oip,arg,invert);
} else if (arg[0] == '-' && arg[1] == 0) {
arg= argv_p ? *++(*argv_p) : value;
if (!arg) usageerr("option `-' must be followed by a domain");
query_do(arg);
} else { /* arg[1] != '-', != '\0' */
invert= (arg[0] == '+');
++arg;
while (*arg) {
oip= opt_finds(&arg);
if (oip->type == ot_funcarg) {
if (!*arg) {
arg= argv_p ? *++(*argv_p) : value;
if (!arg) usageerr("option -%s requires a value argument",oip->sopt);
} else {
if (value) usageerr("two values for option -%s given !",oip->sopt);
}
opt_do(oip,arg,invert);
arg= "";
} else {
if (value) usageerr("option -%s does not take a value",oip->sopt);
opt_do(oip,0,invert);
}
}
}
} else { /* arg[0] != '-' */
query_do(arg);
}
}
static void read_stdin(void) {
static int used, avail;
static char *buf;
int anydone, r;
char *newline, *space;
anydone= 0;
while (!anydone || used) {
while (!(newline= memchr(buf,'\n',used))) {
if (used == avail) {
avail += 20; avail <<= 1;
buf= realloc(buf,avail);
if (!buf) sysfail("realloc stdin buffer",errno);
}
do {
r= read(0,buf+used,avail-used);
} while (r < 0 && errno == EINTR);
if (r == 0) {
if (used) {
/* fake up final newline */
buf[used++]= '\n';
r= 1;
} else {
ov_pipe= 0;
return;
}
}
if (r < 0) sysfail("read stdin",errno);
used += r;
}
*newline++= 0;
space= strchr(buf,' ');
if (space) *space++= 0;
process_optarg(buf,0,space);
used -= (newline-buf);
memmove(buf,newline,used);
anydone= 1;
}
}
int main(int argc, const char *const *argv) {
struct timeval *tv, tvbuf;
adns_query qu;
void *qun_v;
adns_answer *answer;
int r, maxfd;
fd_set readfds, writefds, exceptfds;
const char *arg;
while ((arg= *++argv)) process_optarg(arg,&argv,0);
if (!ov_pipe && !ads) usageerr("no domains given, and -f/--pipe not used; try --help");
ensure_adns_init();
for (;;) {
for (;;) {
qu= ov_asynch ? 0 : outstanding.head ? outstanding.head->qu : 0;
r= adns_check(ads,&qu,&answer,&qun_v);
if (r == EAGAIN) break;
if (r == ESRCH) { if (!ov_pipe) goto x_quit; else break; }
assert(!r);
query_done(qun_v,answer);
}
maxfd= 0;
FD_ZERO(&readfds);
FD_ZERO(&writefds);
FD_ZERO(&exceptfds);
if (ov_pipe) {
maxfd= 1;
FD_SET(0,&readfds);
}
tv= 0;
adns_beforeselect(ads, &maxfd, &readfds,&writefds,&exceptfds, &tv,&tvbuf,0);
r= select(maxfd, &readfds,&writefds,&exceptfds, tv);
if (r == -1) {
if (errno == EINTR) continue;
sysfail("select",errno);
}
adns_afterselect(ads, maxfd, &readfds,&writefds,&exceptfds, 0);
if (ov_pipe && FD_ISSET(0,&readfds)) read_stdin();
}
x_quit:
if (fclose(stdout)) outerr();
exit(rcode);
}
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