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/* $Id: addr.c,v 1.4 1999/12/02 01:06:06 chip Exp $
*
* Operations on addresses, (ASCII representations of destinations).
*
* $Log: addr.c,v $
* Revision 1.4 1999/12/02 01:06:06 chip
* Make SANITIZE contain only graphical danger characters.
*
* Revision 1.3 1993/10/28 16:49:51 chip
* Declare function return types, including void.
*
* Revision 1.2 1991/05/23 17:23:19 chip
* Follow RFC822 definition of header syntax.
* Guard isxxx() macros against negative values.
*
* Revision 1.1 1991/05/13 18:36:55 chip
* Initial revision
*
*/
#include "deliver.h"
/*----------------------------------------------------------------------
* Check an address for cleanliness.
* That is, make sure that it is devoid of shell metacharacters.
* And make sure it's got at least one character, too.
*/
int
addr_clean(addr)
char *addr;
{
char *p;
static char sanitize[] = SANITIZE;
if (*addr == 0)
return FALSE;
for (p = addr; *p; ++p)
{
int c = *p & 0xFF;
if (
#ifdef HH_STRING
!isgraph(c)
#else
(c < 0x20 || c > 0x7F)
#endif
|| strchr(sanitize, c))
{
return FALSE;
}
}
return TRUE;
}
/*----------------------------------------------------------------------
* Report the class of a string representation of a destination.
*/
DCLASS
addr_class(s)
char *s;
{
char *p;
for (p = s; *p; ++p)
{
switch (*p)
{
case '!':
return CL_UUCP;
case ':':
return CL_MBOX;
case '|':
return CL_PROG;
case '?':
return CL_USER;
}
}
return CL_USER;
}
/*----------------------------------------------------------------------
* Parse a string representation of a destination.
* If dfile_ct is non-NULL, then a missing user name refers to that user;
* otherwise, a missing user name refers to the effective user id.
* If dfile_ct is NULL, then we only permit user names and UUCP addresses;
* otherwise, we permit all kinds of addresses.
*/
DEST *
addr_dest(s, dfile_ct)
char *s;
CONTEXT *dfile_ct;
{
DEST *d;
CONTEXT *ct;
char *buf, *p, *q, *user, *param;
char sep;
int i, legal;
/*
* If this is NOT a delivery file, restrict address class
* to user and UUCP.
*/
if (!dfile_ct)
{
DCLASS class;
class = addr_class(s);
if ((class != CL_USER && class != CL_UUCP)
|| strcmp(s, DFILE_DROP) == 0)
{
d = dest(s, CL_USER, (char *) NULL);
dest_err(d, E_DFONLY);
return d;
}
}
/*
* Find the additional information after the user name.
* Bang means UUCP, colon means mailbox, pipe means pipe,
* question means error.
*/
for (i = 0; (sep = s[i]) != 0; ++i)
{
if (sep == '!' || sep == ':' || sep == '|' || sep == '?')
break;
}
/*
* Deal with UUCP paths before the user-name parsing begins.
*/
if (sep == '!')
return dest(s, CL_UUCP, (char *) NULL);
/*
* Copy string to local buffer so we can mangle it.
* Chop it up into user name and parameter.
*/
buf = copystr(s);
if (buf[i])
buf[i++] = 0;
user = buf;
param = buf + i;
/*
* If user name is blank, provide default.
*/
if (*user == 0)
user = (dfile_ct ? dfile_ct : eff_ct)->ct_name;
/*
* Determine if we can get there from here.
*/
if ((ct = name_context(user)) == NULL)
legal = TRUE; /* we can report "no such user" later */
else if (dfile_ct)
legal = ok_context(dfile_ct->ct_uid, dfile_ct->ct_uid,
dfile_ct->ct_gid, ct);
else
legal = ok_context(eff_uid, real_uid, real_gid, ct);
/*
* Now take action based on address class.
*/
/* Could be "user|program" ... */
if (sep == '|')
d = legal ? dest(user, CL_PROG, param) : NULL;
/* Could be "user?error" ... */
else if (sep == '?')
{
if (legal)
{
d = dest(user, CL_USER, (char *) NULL);
dest_err(d, E_ERRMSG);
d->d_errmsg = copystr(param);
}
else
d = NULL;
}
/* Must be "user" or "user:mailbox" */
else
{
/*
* Strip whitespace, eliminate duplicate slashes from
* mailbox filename.
*/
p = q = param;
while (*p)
{
if (isspace(*p & 0xFF))
++p;
else if ((*q++ = *p++) == '/')
{
while (*p == '/')
++p;
}
}
*q = 0;
/*
* Now that blanks are gone, we decide mailbox or not.
* Delaying this test means that "user" equals "user: ".
*/
if (*param)
d = legal ? dest(user, CL_MBOX, param) : NULL;
else
d = dest(user, CL_USER, (char *) NULL);
}
/*
* We allocated the buffer; now we free it.
*/
free(buf);
/* Return parsed destination. */
return d;
}
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