summaryrefslogtreecommitdiffstats
path: root/comm/third_party/libgcrypt/src/sexp.c
diff options
context:
space:
mode:
Diffstat (limited to 'comm/third_party/libgcrypt/src/sexp.c')
-rw-r--r--comm/third_party/libgcrypt/src/sexp.c2699
1 files changed, 2699 insertions, 0 deletions
diff --git a/comm/third_party/libgcrypt/src/sexp.c b/comm/third_party/libgcrypt/src/sexp.c
new file mode 100644
index 0000000000..864916bef7
--- /dev/null
+++ b/comm/third_party/libgcrypt/src/sexp.c
@@ -0,0 +1,2699 @@
+/* sexp.c - S-Expression handling
+ * Copyright (C) 1999, 2000, 2001, 2002, 2003,
+ * 2004, 2006, 2007, 2008, 2011 Free Software Foundation, Inc.
+ * Copyright (C) 2013, 2014, 2017 g10 Code GmbH
+ *
+ * This file is part of Libgcrypt.
+ *
+ * Libgcrypt is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser general Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * Libgcrypt 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1+
+ */
+
+
+#include <config.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdarg.h>
+#include <ctype.h>
+#include <errno.h>
+
+#define GCRYPT_NO_MPI_MACROS 1
+#include "g10lib.h"
+
+
+/* Notes on the internal memory layout.
+
+ We store an S-expression as one memory buffer with tags, length and
+ value. The simplest list would thus be:
+
+ /----------+----------+---------+------+-----------+----------\
+ | open_tag | data_tag | datalen | data | close_tag | stop_tag |
+ \----------+----------+---------+------+-----------+----------/
+
+ Expressed more compact and with an example:
+
+ /----+----+----+---+----+----\
+ | OT | DT | DL | D | CT | ST | "(foo)"
+ \----+----+----+---+----+----/
+
+ The open tag must always be the first tag of a list as requires by
+ the S-expression specs. At least data element (data_tag, datalen,
+ data) is required as well. The close_tag finishes the list and
+ would actually be sufficient. For fail-safe reasons a final stop
+ tag is always the last byte in a buffer; it has a value of 0 so
+ that string function accidentally applied to an S-expression will
+ never access unallocated data. We do not support display hints and
+ thus don't need to represent them. A list may have more an
+ arbitrary number of data elements but at least one is required.
+ The length of each data must be greater than 0 and has a current
+ limit to 65535 bytes (by means of the DATALEN type).
+
+ A list with two data elements:
+
+ /----+----+----+---+----+----+---+----+----\
+ | OT | DT | DL | D | DT | DL | D | CT | ST | "(foo bar)"
+ \----+----+----+---+----+----+---+----+----/
+
+ In the above example both DL fields have a value of 3.
+ A list of a list with one data element:
+
+ /----+----+----+----+---+----+----+----\
+ | OT | OT | DT | DL | D | CT | CT | ST | "((foo))"
+ \----+----+----+----+---+----+----+----/
+
+ A list with one element followed by another list:
+
+ /----+----+----+---+----+----+----+---+----+----+----\
+ | OT | DT | DL | D | OT | DT | DL | D | CT | CT | ST | "(foo (bar))"
+ \----+----+----+---+----+----+----+---+----+----+----/
+
+ */
+
+typedef unsigned short DATALEN;
+
+struct gcry_sexp
+{
+ byte d[1];
+};
+
+#define ST_STOP 0
+#define ST_DATA 1 /* datalen follows */
+/*#define ST_HINT 2 datalen follows (currently not used) */
+#define ST_OPEN 3
+#define ST_CLOSE 4
+
+/* The atoi macros assume that the buffer has only valid digits. */
+#define atoi_1(p) (*(p) - '0' )
+#define xtoi_1(p) (*(p) <= '9'? (*(p)- '0'): \
+ *(p) <= 'F'? (*(p)-'A'+10):(*(p)-'a'+10))
+#define xtoi_2(p) ((xtoi_1(p) * 16) + xtoi_1((p)+1))
+
+#define TOKEN_SPECIALS "-./_:*+="
+
+static gcry_err_code_t
+do_vsexp_sscan (gcry_sexp_t *retsexp, size_t *erroff,
+ const char *buffer, size_t length, int argflag,
+ void **arg_list, va_list arg_ptr);
+
+static gcry_err_code_t
+do_sexp_sscan (gcry_sexp_t *retsexp, size_t *erroff,
+ const char *buffer, size_t length, int argflag,
+ void **arg_list, ...);
+
+/* Return true if P points to a byte containing a whitespace according
+ to the S-expressions definition. */
+#undef whitespacep
+static GPG_ERR_INLINE int
+whitespacep (const char *p)
+{
+ switch (*p)
+ {
+ case ' ': case '\t': case '\v': case '\f': case '\r': case '\n': return 1;
+ default: return 0;
+ }
+}
+
+
+#if 0
+static void
+dump_mpi( gcry_mpi_t a )
+{
+ char buffer[1000];
+ size_t n = 1000;
+
+ if( !a )
+ fputs("[no MPI]", stderr );
+ else if( gcry_mpi_print( GCRYMPI_FMT_HEX, buffer, &n, a ) )
+ fputs("[MPI too large to print]", stderr );
+ else
+ fputs( buffer, stderr );
+}
+#endif
+
+static void
+dump_string (const byte *p, size_t n, int delim )
+{
+ for (; n; n--, p++ )
+ {
+ if ((*p & 0x80) || iscntrl( *p ) || *p == delim )
+ {
+ if( *p == '\n' )
+ log_printf ("\\n");
+ else if( *p == '\r' )
+ log_printf ("\\r");
+ else if( *p == '\f' )
+ log_printf ("\\f");
+ else if( *p == '\v' )
+ log_printf ("\\v");
+ else if( *p == '\b' )
+ log_printf ("\\b");
+ else if( !*p )
+ log_printf ("\\0");
+ else
+ log_printf ("\\x%02x", *p );
+ }
+ else
+ log_printf ("%c", *p);
+ }
+}
+
+
+void
+_gcry_sexp_dump (const gcry_sexp_t a)
+{
+ const byte *p;
+ int indent = 0;
+ int type;
+
+ if (!a)
+ {
+ log_printf ( "[nil]\n");
+ return;
+ }
+
+ p = a->d;
+ while ( (type = *p) != ST_STOP )
+ {
+ p++;
+ switch ( type )
+ {
+ case ST_OPEN:
+ log_printf ("%*s[open]\n", 2*indent, "");
+ indent++;
+ break;
+ case ST_CLOSE:
+ if( indent )
+ indent--;
+ log_printf ("%*s[close]\n", 2*indent, "");
+ break;
+ case ST_DATA: {
+ DATALEN n;
+ memcpy ( &n, p, sizeof n );
+ p += sizeof n;
+ log_printf ("%*s[data=\"", 2*indent, "" );
+ dump_string (p, n, '\"' );
+ log_printf ("\"]\n");
+ p += n;
+ }
+ break;
+ default:
+ log_printf ("%*s[unknown tag %d]\n", 2*indent, "", type);
+ break;
+ }
+ }
+}
+
+
+/* Pass list through except when it is an empty list - in that case
+ * return NULL and release the passed list. This is used to make sure
+ * that no forbidden empty lists are created.
+ */
+static gcry_sexp_t
+normalize ( gcry_sexp_t list )
+{
+ unsigned char *p;
+
+ if ( !list )
+ return NULL;
+ p = list->d;
+ if ( *p == ST_STOP )
+ {
+ /* this is "" */
+ sexp_release ( list );
+ return NULL;
+ }
+ if ( *p == ST_OPEN && p[1] == ST_CLOSE )
+ {
+ /* this is "()" */
+ sexp_release ( list );
+ return NULL;
+ }
+
+ return list;
+}
+
+/* Create a new S-expression object by reading LENGTH bytes from
+ BUFFER, assuming it is canonical encoded or autodetected encoding
+ when AUTODETECT is set to 1. With FREEFNC not NULL, ownership of
+ the buffer is transferred to the newly created object. FREEFNC
+ should be the freefnc used to release BUFFER; there is no guarantee
+ at which point this function is called; most likey you want to use
+ free() or gcry_free().
+
+ Passing LENGTH and AUTODETECT as 0 is allowed to indicate that
+ BUFFER points to a valid canonical encoded S-expression. A LENGTH
+ of 0 and AUTODETECT 1 indicates that buffer points to a
+ null-terminated string.
+
+ This function returns 0 and and the pointer to the new object in
+ RETSEXP or an error code in which case RETSEXP is set to NULL. */
+gcry_err_code_t
+_gcry_sexp_create (gcry_sexp_t *retsexp, void *buffer, size_t length,
+ int autodetect, void (*freefnc)(void*) )
+{
+ gcry_err_code_t errcode;
+ gcry_sexp_t se;
+
+ if (!retsexp)
+ return GPG_ERR_INV_ARG;
+ *retsexp = NULL;
+ if (autodetect < 0 || autodetect > 1 || !buffer)
+ return GPG_ERR_INV_ARG;
+
+ if (!length && !autodetect)
+ { /* What a brave caller to assume that there is really a canonical
+ encoded S-expression in buffer */
+ length = _gcry_sexp_canon_len (buffer, 0, NULL, &errcode);
+ if (!length)
+ return errcode;
+ }
+ else if (!length && autodetect)
+ { /* buffer is a string */
+ length = strlen ((char *)buffer);
+ }
+
+ errcode = do_sexp_sscan (&se, NULL, buffer, length, 0, NULL);
+ if (errcode)
+ return errcode;
+
+ *retsexp = se;
+ if (freefnc)
+ {
+ /* For now we release the buffer immediately. As soon as we
+ have changed the internal represenation of S-expression to
+ the canoncial format - which has the advantage of faster
+ parsing - we will use this function as a closure in our
+ GCRYSEXP object and use the BUFFER directly. */
+ freefnc (buffer);
+ }
+ return 0;
+}
+
+/* Same as gcry_sexp_create but don't transfer ownership */
+gcry_err_code_t
+_gcry_sexp_new (gcry_sexp_t *retsexp, const void *buffer, size_t length,
+ int autodetect)
+{
+ return _gcry_sexp_create (retsexp, (void *)buffer, length, autodetect, NULL);
+}
+
+
+/****************
+ * Release resource of the given SEXP object.
+ */
+void
+_gcry_sexp_release( gcry_sexp_t sexp )
+{
+ if (sexp)
+ {
+ if (_gcry_is_secure (sexp))
+ {
+ /* Extra paranoid wiping. */
+ const byte *p = sexp->d;
+ int type;
+
+ while ( (type = *p) != ST_STOP )
+ {
+ p++;
+ switch ( type )
+ {
+ case ST_OPEN:
+ break;
+ case ST_CLOSE:
+ break;
+ case ST_DATA:
+ {
+ DATALEN n;
+ memcpy ( &n, p, sizeof n );
+ p += sizeof n;
+ p += n;
+ }
+ break;
+ default:
+ break;
+ }
+ }
+ wipememory (sexp->d, p - sexp->d);
+ }
+ xfree ( sexp );
+ }
+}
+
+
+/****************
+ * Make a pair from lists a and b, don't use a or b later on.
+ * Special behaviour: If one is a single element list we put the
+ * element straight into the new pair.
+ */
+gcry_sexp_t
+_gcry_sexp_cons( const gcry_sexp_t a, const gcry_sexp_t b )
+{
+ (void)a;
+ (void)b;
+
+ /* NYI: Implementation should be quite easy with our new data
+ representation */
+ BUG ();
+ return NULL;
+}
+
+
+/****************
+ * Make a list from all items in the array the end of the array is marked
+ * with a NULL.
+ */
+gcry_sexp_t
+_gcry_sexp_alist( const gcry_sexp_t *array )
+{
+ (void)array;
+
+ /* NYI: Implementation should be quite easy with our new data
+ representation. */
+ BUG ();
+ return NULL;
+}
+
+/****************
+ * Make a list from all items, the end of list is indicated by a NULL
+ */
+gcry_sexp_t
+_gcry_sexp_vlist( const gcry_sexp_t a, ... )
+{
+ (void)a;
+ /* NYI: Implementation should be quite easy with our new data
+ representation. */
+ BUG ();
+ return NULL;
+}
+
+
+/****************
+ * Append n to the list a
+ * Returns: a new list (which maybe a)
+ */
+gcry_sexp_t
+_gcry_sexp_append( const gcry_sexp_t a, const gcry_sexp_t n )
+{
+ (void)a;
+ (void)n;
+ /* NYI: Implementation should be quite easy with our new data
+ representation. */
+ BUG ();
+ return NULL;
+}
+
+gcry_sexp_t
+_gcry_sexp_prepend( const gcry_sexp_t a, const gcry_sexp_t n )
+{
+ (void)a;
+ (void)n;
+ /* NYI: Implementation should be quite easy with our new data
+ representation. */
+ BUG ();
+ return NULL;
+}
+
+
+
+/****************
+ * Locate token in a list. The token must be the car of a sublist.
+ * Returns: A new list with this sublist or NULL if not found.
+ */
+gcry_sexp_t
+_gcry_sexp_find_token( const gcry_sexp_t list, const char *tok, size_t toklen )
+{
+ const byte *p;
+ DATALEN n;
+
+ if ( !list )
+ return NULL;
+
+ if ( !toklen )
+ toklen = strlen(tok);
+
+ p = list->d;
+ while ( *p != ST_STOP )
+ {
+ if ( *p == ST_OPEN && p[1] == ST_DATA )
+ {
+ const byte *head = p;
+
+ p += 2;
+ memcpy ( &n, p, sizeof n );
+ p += sizeof n;
+ if ( n == toklen && !memcmp( p, tok, toklen ) )
+ { /* found it */
+ gcry_sexp_t newlist;
+ byte *d;
+ int level = 1;
+
+ /* Look for the end of the list. */
+ for ( p += n; level; p++ )
+ {
+ if ( *p == ST_DATA )
+ {
+ memcpy ( &n, ++p, sizeof n );
+ p += sizeof n + n;
+ p--; /* Compensate for later increment. */
+ }
+ else if ( *p == ST_OPEN )
+ {
+ level++;
+ }
+ else if ( *p == ST_CLOSE )
+ {
+ level--;
+ }
+ else if ( *p == ST_STOP )
+ {
+ BUG ();
+ }
+ }
+ n = p - head;
+
+ newlist = xtrymalloc ( sizeof *newlist + n );
+ if (!newlist)
+ {
+ /* No way to return an error code, so we can only
+ return Not Found. */
+ return NULL;
+ }
+ d = newlist->d;
+ memcpy ( d, head, n ); d += n;
+ *d++ = ST_STOP;
+ return normalize ( newlist );
+ }
+ p += n;
+ }
+ else if ( *p == ST_DATA )
+ {
+ memcpy ( &n, ++p, sizeof n ); p += sizeof n;
+ p += n;
+ }
+ else
+ p++;
+ }
+ return NULL;
+}
+
+/****************
+ * Return the length of the given list
+ */
+int
+_gcry_sexp_length (const gcry_sexp_t list)
+{
+ const byte *p;
+ DATALEN n;
+ int type;
+ int length = 0;
+ int level = 0;
+
+ if (!list)
+ return 0;
+
+ p = list->d;
+ while ((type=*p) != ST_STOP)
+ {
+ p++;
+ if (type == ST_DATA)
+ {
+ memcpy (&n, p, sizeof n);
+ p += sizeof n + n;
+ if (level == 1)
+ length++;
+ }
+ else if (type == ST_OPEN)
+ {
+ if (level == 1)
+ length++;
+ level++;
+ }
+ else if (type == ST_CLOSE)
+ {
+ level--;
+ }
+ }
+ return length;
+}
+
+
+/* Return the internal lengths offset of LIST. That is the size of
+ the buffer from the first ST_OPEN, which is returned at R_OFF, to
+ the corresponding ST_CLOSE inclusive. */
+static size_t
+get_internal_buffer (const gcry_sexp_t list, size_t *r_off)
+{
+ const unsigned char *p;
+ DATALEN n;
+ int type;
+ int level = 0;
+
+ *r_off = 0;
+ if (list)
+ {
+ p = list->d;
+ while ( (type=*p) != ST_STOP )
+ {
+ p++;
+ if (type == ST_DATA)
+ {
+ memcpy (&n, p, sizeof n);
+ p += sizeof n + n;
+ }
+ else if (type == ST_OPEN)
+ {
+ if (!level)
+ *r_off = (p-1) - list->d;
+ level++;
+ }
+ else if ( type == ST_CLOSE )
+ {
+ level--;
+ if (!level)
+ return p - list->d;
+ }
+ }
+ }
+ return 0; /* Not a proper list. */
+}
+
+
+
+/* Extract the n-th element of the given LIST. Returns NULL for
+ no-such-element, a corrupt list, or memory failure. */
+gcry_sexp_t
+_gcry_sexp_nth (const gcry_sexp_t list, int number)
+{
+ const byte *p;
+ DATALEN n;
+ gcry_sexp_t newlist;
+ byte *d;
+ int level = 0;
+
+ if (!list || list->d[0] != ST_OPEN)
+ return NULL;
+ p = list->d;
+
+ while (number > 0)
+ {
+ p++;
+ if (*p == ST_DATA)
+ {
+ memcpy (&n, ++p, sizeof n);
+ p += sizeof n + n;
+ p--;
+ if (!level)
+ number--;
+ }
+ else if (*p == ST_OPEN)
+ {
+ level++;
+ }
+ else if (*p == ST_CLOSE)
+ {
+ level--;
+ if ( !level )
+ number--;
+ }
+ else if (*p == ST_STOP)
+ {
+ return NULL;
+ }
+ }
+ p++;
+
+ if (*p == ST_DATA)
+ {
+ memcpy (&n, p+1, sizeof n);
+ newlist = xtrymalloc (sizeof *newlist + 1 + 1 + sizeof n + n + 1);
+ if (!newlist)
+ return NULL;
+ d = newlist->d;
+ *d++ = ST_OPEN;
+ memcpy (d, p, 1 + sizeof n + n);
+ d += 1 + sizeof n + n;
+ *d++ = ST_CLOSE;
+ *d = ST_STOP;
+ }
+ else if (*p == ST_OPEN)
+ {
+ const byte *head = p;
+
+ level = 1;
+ do {
+ p++;
+ if (*p == ST_DATA)
+ {
+ memcpy (&n, ++p, sizeof n);
+ p += sizeof n + n;
+ p--;
+ }
+ else if (*p == ST_OPEN)
+ {
+ level++;
+ }
+ else if (*p == ST_CLOSE)
+ {
+ level--;
+ }
+ else if (*p == ST_STOP)
+ {
+ BUG ();
+ }
+ } while (level);
+ n = p + 1 - head;
+
+ newlist = xtrymalloc (sizeof *newlist + n);
+ if (!newlist)
+ return NULL;
+ d = newlist->d;
+ memcpy (d, head, n);
+ d += n;
+ *d++ = ST_STOP;
+ }
+ else
+ newlist = NULL;
+
+ return normalize (newlist);
+}
+
+
+gcry_sexp_t
+_gcry_sexp_car (const gcry_sexp_t list)
+{
+ return _gcry_sexp_nth (list, 0);
+}
+
+
+/* Helper to get data from the car. The returned value is valid as
+ long as the list is not modified. */
+static const char *
+do_sexp_nth_data (const gcry_sexp_t list, int number, size_t *datalen)
+{
+ const byte *p;
+ DATALEN n;
+ int level = 0;
+
+ *datalen = 0;
+ if ( !list )
+ return NULL;
+
+ p = list->d;
+ if ( *p == ST_OPEN )
+ p++; /* Yep, a list. */
+ else if (number)
+ return NULL; /* Not a list but N > 0 requested. */
+
+ /* Skip over N elements. */
+ while (number > 0)
+ {
+ if (*p == ST_DATA)
+ {
+ memcpy ( &n, ++p, sizeof n );
+ p += sizeof n + n;
+ p--;
+ if ( !level )
+ number--;
+ }
+ else if (*p == ST_OPEN)
+ {
+ level++;
+ }
+ else if (*p == ST_CLOSE)
+ {
+ level--;
+ if ( !level )
+ number--;
+ }
+ else if (*p == ST_STOP)
+ {
+ return NULL;
+ }
+ p++;
+ }
+
+ /* If this is data, return it. */
+ if (*p == ST_DATA)
+ {
+ memcpy ( &n, ++p, sizeof n );
+ *datalen = n;
+ return (const char*)p + sizeof n;
+ }
+
+ return NULL;
+}
+
+
+/* Get data from the car. The returned value is valid as long as the
+ list is not modified. */
+const char *
+_gcry_sexp_nth_data (const gcry_sexp_t list, int number, size_t *datalen )
+{
+ return do_sexp_nth_data (list, number, datalen);
+}
+
+
+/* Get the nth element of a list which needs to be a simple object.
+ The returned value is a malloced buffer and needs to be freed by
+ the caller. This is basically the same as gcry_sexp_nth_data but
+ with an allocated result. */
+void *
+_gcry_sexp_nth_buffer (const gcry_sexp_t list, int number, size_t *rlength)
+{
+ const char *s;
+ size_t n;
+ char *buf;
+
+ *rlength = 0;
+ s = do_sexp_nth_data (list, number, &n);
+ if (!s || !n)
+ return NULL;
+ buf = xtrymalloc (n);
+ if (!buf)
+ return NULL;
+ memcpy (buf, s, n);
+ *rlength = n;
+ return buf;
+}
+
+
+/* Get a string from the car. The returned value is a malloced string
+ and needs to be freed by the caller. */
+char *
+_gcry_sexp_nth_string (const gcry_sexp_t list, int number)
+{
+ const char *s;
+ size_t n;
+ char *buf;
+
+ s = do_sexp_nth_data (list, number, &n);
+ if (!s || n < 1 || (n+1) < 1)
+ return NULL;
+ buf = xtrymalloc (n+1);
+ if (!buf)
+ return NULL;
+ memcpy (buf, s, n);
+ buf[n] = 0;
+ return buf;
+}
+
+
+/*
+ * Get a MPI from the car
+ */
+gcry_mpi_t
+_gcry_sexp_nth_mpi (gcry_sexp_t list, int number, int mpifmt)
+{
+ size_t n;
+ gcry_mpi_t a;
+
+ if (mpifmt == GCRYMPI_FMT_OPAQUE)
+ {
+ char *p;
+
+ p = _gcry_sexp_nth_buffer (list, number, &n);
+ if (!p)
+ return NULL;
+
+ a = _gcry_is_secure (list)? _gcry_mpi_snew (0) : _gcry_mpi_new (0);
+ if (a)
+ mpi_set_opaque (a, p, n*8);
+ else
+ xfree (p);
+ }
+ else
+ {
+ const char *s;
+
+ if (!mpifmt)
+ mpifmt = GCRYMPI_FMT_STD;
+
+ s = do_sexp_nth_data (list, number, &n);
+ if (!s)
+ return NULL;
+
+ if (_gcry_mpi_scan (&a, mpifmt, s, n, NULL))
+ return NULL;
+ }
+
+ return a;
+}
+
+
+/****************
+ * Get the CDR
+ */
+gcry_sexp_t
+_gcry_sexp_cdr(const gcry_sexp_t list)
+{
+ const byte *p;
+ const byte *head;
+ DATALEN n;
+ gcry_sexp_t newlist;
+ byte *d;
+ int level = 0;
+ int skip = 1;
+
+ if (!list || list->d[0] != ST_OPEN)
+ return NULL;
+ p = list->d;
+
+ while (skip > 0)
+ {
+ p++;
+ if (*p == ST_DATA)
+ {
+ memcpy ( &n, ++p, sizeof n );
+ p += sizeof n + n;
+ p--;
+ if ( !level )
+ skip--;
+ }
+ else if (*p == ST_OPEN)
+ {
+ level++;
+ }
+ else if (*p == ST_CLOSE)
+ {
+ level--;
+ if ( !level )
+ skip--;
+ }
+ else if (*p == ST_STOP)
+ {
+ return NULL;
+ }
+ }
+ p++;
+
+ head = p;
+ level = 0;
+ do {
+ if (*p == ST_DATA)
+ {
+ memcpy ( &n, ++p, sizeof n );
+ p += sizeof n + n;
+ p--;
+ }
+ else if (*p == ST_OPEN)
+ {
+ level++;
+ }
+ else if (*p == ST_CLOSE)
+ {
+ level--;
+ }
+ else if (*p == ST_STOP)
+ {
+ return NULL;
+ }
+ p++;
+ } while (level);
+ n = p - head;
+
+ newlist = xtrymalloc (sizeof *newlist + n + 2);
+ if (!newlist)
+ return NULL;
+ d = newlist->d;
+ *d++ = ST_OPEN;
+ memcpy (d, head, n);
+ d += n;
+ *d++ = ST_CLOSE;
+ *d++ = ST_STOP;
+
+ return normalize (newlist);
+}
+
+
+gcry_sexp_t
+_gcry_sexp_cadr ( const gcry_sexp_t list )
+{
+ gcry_sexp_t a, b;
+
+ a = _gcry_sexp_cdr (list);
+ b = _gcry_sexp_car (a);
+ sexp_release (a);
+ return b;
+}
+
+
+static GPG_ERR_INLINE int
+hextonibble (int s)
+{
+ if (s >= '0' && s <= '9')
+ return s - '0';
+ else if (s >= 'A' && s <= 'F')
+ return 10 + s - 'A';
+ else if (s >= 'a' && s <= 'f')
+ return 10 + s - 'a';
+ else
+ return 0;
+}
+
+
+struct make_space_ctx
+{
+ gcry_sexp_t sexp;
+ size_t allocated;
+ byte *pos;
+};
+
+
+static gpg_err_code_t
+make_space ( struct make_space_ctx *c, size_t n )
+{
+ size_t used = c->pos - c->sexp->d;
+
+ if ( used + n + sizeof(DATALEN) + 1 >= c->allocated )
+ {
+ gcry_sexp_t newsexp;
+ byte *newhead;
+ size_t newsize;
+
+ newsize = c->allocated + 2*(n+sizeof(DATALEN)+1);
+ if (newsize <= c->allocated)
+ return GPG_ERR_TOO_LARGE;
+ newsexp = xtryrealloc ( c->sexp, sizeof *newsexp + newsize - 1);
+ if (!newsexp)
+ return gpg_err_code_from_errno (errno);
+ c->allocated = newsize;
+ newhead = newsexp->d;
+ c->pos = newhead + used;
+ c->sexp = newsexp;
+ }
+ return 0;
+}
+
+
+/* Unquote STRING of LENGTH and store it into BUF. The surrounding
+ quotes are must already be removed from STRING. We assume that the
+ quoted string is syntacillay correct. */
+static size_t
+unquote_string (const char *string, size_t length, unsigned char *buf)
+{
+ int esc = 0;
+ const unsigned char *s = (const unsigned char*)string;
+ unsigned char *d = buf;
+ size_t n = length;
+
+ for (; n; n--, s++)
+ {
+ if (esc)
+ {
+ switch (*s)
+ {
+ case 'b': *d++ = '\b'; break;
+ case 't': *d++ = '\t'; break;
+ case 'v': *d++ = '\v'; break;
+ case 'n': *d++ = '\n'; break;
+ case 'f': *d++ = '\f'; break;
+ case 'r': *d++ = '\r'; break;
+ case '"': *d++ = '\"'; break;
+ case '\'': *d++ = '\''; break;
+ case '\\': *d++ = '\\'; break;
+
+ case '\r': /* ignore CR[,LF] */
+ if (n>1 && s[1] == '\n')
+ {
+ s++; n--;
+ }
+ break;
+
+ case '\n': /* ignore LF[,CR] */
+ if (n>1 && s[1] == '\r')
+ {
+ s++; n--;
+ }
+ break;
+
+ case 'x': /* hex value */
+ if (n>2 && hexdigitp (s+1) && hexdigitp (s+2))
+ {
+ s++; n--;
+ *d++ = xtoi_2 (s);
+ s++; n--;
+ }
+ break;
+
+ default:
+ if (n>2 && octdigitp (s) && octdigitp (s+1) && octdigitp (s+2))
+ {
+ *d++ = (atoi_1 (s)*64) + (atoi_1 (s+1)*8) + atoi_1 (s+2);
+ s += 2;
+ n -= 2;
+ }
+ break;
+ }
+ esc = 0;
+ }
+ else if( *s == '\\' )
+ esc = 1;
+ else
+ *d++ = *s;
+ }
+
+ return d - buf;
+}
+
+/****************
+ * Scan the provided buffer and return the S expression in our internal
+ * format. Returns a newly allocated expression. If erroff is not NULL and
+ * a parsing error has occurred, the offset into buffer will be returned.
+ * If ARGFLAG is true, the function supports some printf like
+ * expressions.
+ * These are:
+ * %m - MPI
+ * %s - string (no autoswitch to secure allocation)
+ * %d - integer stored as string (no autoswitch to secure allocation)
+ * %b - memory buffer; this takes _two_ arguments: an integer with the
+ * length of the buffer and a pointer to the buffer.
+ * %S - Copy an gcry_sexp_t here. The S-expression needs to be a
+ * regular one, starting with a parenthesis.
+ * (no autoswitch to secure allocation)
+ * all other format elements are currently not defined and return an error.
+ * this includes the "%%" sequence becauce the percent sign is not an
+ * allowed character.
+ * FIXME: We should find a way to store the secure-MPIs not in the string
+ * but as reference to somewhere - this can help us to save huge amounts
+ * of secure memory. The problem is, that if only one element is secure, all
+ * other elements are automagicaly copied to secure memory too, so the most
+ * common operation gcry_sexp_cdr_mpi() will always return a secure MPI
+ * regardless whether it is needed or not.
+ */
+static gpg_err_code_t
+do_vsexp_sscan (gcry_sexp_t *retsexp, size_t *erroff,
+ const char *buffer, size_t length, int argflag,
+ void **arg_list, va_list arg_ptr)
+{
+ gcry_err_code_t err = 0;
+ static const char tokenchars[] =
+ "abcdefghijklmnopqrstuvwxyz"
+ "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+ "0123456789-./_:*+=";
+ const char *p;
+ size_t n;
+ const char *digptr = NULL;
+ const char *quoted = NULL;
+ const char *tokenp = NULL;
+ const char *hexfmt = NULL;
+ const char *base64 = NULL;
+ const char *disphint = NULL;
+ const char *percent = NULL;
+ int hexcount = 0;
+ int b64count = 0;
+ int quoted_esc = 0;
+ size_t datalen = 0;
+ size_t dummy_erroff;
+ struct make_space_ctx c;
+ int arg_counter = 0;
+ int level = 0;
+
+ if (!retsexp)
+ return GPG_ERR_INV_ARG;
+ *retsexp = NULL;
+
+ if (!buffer)
+ return GPG_ERR_INV_ARG;
+
+ if (!erroff)
+ erroff = &dummy_erroff;
+
+ /* Depending on whether ARG_LIST is non-zero or not, this macro gives
+ us the next argument, either from the variable argument list as
+ specified by ARG_PTR or from the argument array ARG_LIST. */
+#define ARG_NEXT(storage, type) \
+ do \
+ { \
+ if (!arg_list) \
+ storage = va_arg (arg_ptr, type); \
+ else \
+ storage = *((type *) (arg_list[arg_counter++])); \
+ } \
+ while (0)
+
+ /* The MAKE_SPACE macro is used before each store operation to
+ ensure that the buffer is large enough. It requires a global
+ context named C and jumps out to the label LEAVE on error! It
+ also sets ERROFF using the variables BUFFER and P. */
+#define MAKE_SPACE(n) do { \
+ gpg_err_code_t _ms_err = make_space (&c, (n)); \
+ if (_ms_err) \
+ { \
+ err = _ms_err; \
+ *erroff = p - buffer; \
+ goto leave; \
+ } \
+ } while (0)
+
+ /* The STORE_LEN macro is used to store the length N at buffer P. */
+#define STORE_LEN(p,n) do { \
+ DATALEN ashort = (n); \
+ memcpy ( (p), &ashort, sizeof(ashort) ); \
+ (p) += sizeof (ashort); \
+ } while (0)
+
+ /* We assume that the internal representation takes less memory than
+ the provided one. However, we add space for one extra datalen so
+ that the code which does the ST_CLOSE can use MAKE_SPACE */
+ c.allocated = length + sizeof(DATALEN);
+ if (length && _gcry_is_secure (buffer))
+ c.sexp = xtrymalloc_secure (sizeof *c.sexp + c.allocated - 1);
+ else
+ c.sexp = xtrymalloc (sizeof *c.sexp + c.allocated - 1);
+ if (!c.sexp)
+ {
+ err = gpg_err_code_from_errno (errno);
+ *erroff = 0;
+ goto leave;
+ }
+ c.pos = c.sexp->d;
+
+ for (p = buffer, n = length; n; p++, n--)
+ {
+ if (tokenp && !hexfmt)
+ {
+ if (strchr (tokenchars, *p))
+ continue;
+ else
+ {
+ datalen = p - tokenp;
+ MAKE_SPACE (datalen);
+ *c.pos++ = ST_DATA;
+ STORE_LEN (c.pos, datalen);
+ memcpy (c.pos, tokenp, datalen);
+ c.pos += datalen;
+ tokenp = NULL;
+ }
+ }
+
+ if (quoted)
+ {
+ if (quoted_esc)
+ {
+ switch (*p)
+ {
+ case 'b': case 't': case 'v': case 'n': case 'f':
+ case 'r': case '"': case '\'': case '\\':
+ quoted_esc = 0;
+ break;
+
+ case '0': case '1': case '2': case '3': case '4':
+ case '5': case '6': case '7':
+ if (!((n > 2)
+ && (p[1] >= '0') && (p[1] <= '7')
+ && (p[2] >= '0') && (p[2] <= '7')))
+ {
+ *erroff = p - buffer;
+ /* Invalid octal value. */
+ err = GPG_ERR_SEXP_BAD_QUOTATION;
+ goto leave;
+ }
+ p += 2;
+ n -= 2;
+ quoted_esc = 0;
+ break;
+
+ case 'x':
+ if (!((n > 2) && hexdigitp (p+1) && hexdigitp (p+2)))
+ {
+ *erroff = p - buffer;
+ /* Invalid hex value. */
+ err = GPG_ERR_SEXP_BAD_QUOTATION;
+ goto leave;
+ }
+ p += 2;
+ n -= 2;
+ quoted_esc = 0;
+ break;
+
+ case '\r':
+ /* ignore CR[,LF] */
+ if (n && (p[1] == '\n'))
+ {
+ p++;
+ n--;
+ }
+ quoted_esc = 0;
+ break;
+
+ case '\n':
+ /* ignore LF[,CR] */
+ if (n && (p[1] == '\r'))
+ {
+ p++;
+ n--;
+ }
+ quoted_esc = 0;
+ break;
+
+ default:
+ *erroff = p - buffer;
+ /* Invalid quoted string escape. */
+ err = GPG_ERR_SEXP_BAD_QUOTATION;
+ goto leave;
+ }
+ }
+ else if (*p == '\\')
+ quoted_esc = 1;
+ else if (*p == '\"')
+ {
+ /* Keep it easy - we know that the unquoted string will
+ never be larger. */
+ unsigned char *save;
+ size_t len;
+
+ quoted++; /* Skip leading quote. */
+ MAKE_SPACE (p - quoted);
+ *c.pos++ = ST_DATA;
+ save = c.pos;
+ STORE_LEN (c.pos, 0); /* Will be fixed up later. */
+ len = unquote_string (quoted, p - quoted, c.pos);
+ c.pos += len;
+ STORE_LEN (save, len);
+ quoted = NULL;
+ }
+ }
+ else if (hexfmt)
+ {
+ if (isxdigit (*p))
+ hexcount++;
+ else if (*p == '#')
+ {
+ if ((hexcount & 1))
+ {
+ *erroff = p - buffer;
+ err = GPG_ERR_SEXP_ODD_HEX_NUMBERS;
+ goto leave;
+ }
+
+ datalen = hexcount / 2;
+ MAKE_SPACE (datalen);
+ *c.pos++ = ST_DATA;
+ STORE_LEN (c.pos, datalen);
+ for (hexfmt++; hexfmt < p; hexfmt++)
+ {
+ int tmpc;
+
+ if (whitespacep (hexfmt))
+ continue;
+ tmpc = hextonibble (*(const unsigned char*)hexfmt);
+ for (hexfmt++; hexfmt < p && whitespacep (hexfmt); hexfmt++)
+ ;
+ if (hexfmt < p)
+ {
+ tmpc *= 16;
+ tmpc += hextonibble (*(const unsigned char*)hexfmt);
+ }
+ *c.pos++ = tmpc;
+ }
+ hexfmt = NULL;
+ }
+ else if (!whitespacep (p))
+ {
+ *erroff = p - buffer;
+ err = GPG_ERR_SEXP_BAD_HEX_CHAR;
+ goto leave;
+ }
+ }
+ else if (base64)
+ {
+ if (digitp (p) || alphap (p) || *p == '+' || *p == '/' || *p == '=')
+ b64count++;
+ else if (*p == '|')
+ {
+ gpgrt_b64state_t b64state;
+ char *b64buf;
+ int i;
+
+ base64++; /* Skip beginning '|' */
+ b64buf = xtrymalloc (b64count);
+ if (!b64buf)
+ {
+ err = gpg_err_code_from_syserror ();
+ goto leave;
+ }
+ memcpy (b64buf, base64, b64count);
+
+ b64state = gpgrt_b64dec_start (NULL);
+ if (!b64state)
+ {
+ err = gpg_err_code_from_syserror ();
+ xfree (b64buf);
+ goto leave;
+ }
+ err = gpgrt_b64dec_proc (b64state, b64buf, b64count,
+ &datalen);
+ if (err && gpg_err_code (err) != GPG_ERR_EOF)
+ {
+ xfree (b64state);
+ xfree (b64buf);
+ goto leave;
+ }
+ err = gpgrt_b64dec_finish (b64state);
+ if (err)
+ {
+ xfree (b64buf);
+ goto leave;
+ }
+
+ MAKE_SPACE (datalen);
+ *c.pos++ = ST_DATA;
+ STORE_LEN (c.pos, datalen);
+ for (i = 0; i < datalen; i++)
+ *c.pos++ = b64buf[i];
+
+ xfree (b64buf);
+ base64 = NULL;
+ }
+ else
+ {
+ *erroff = p - buffer;
+ err = GPG_ERR_SEXP_BAD_CHARACTER;
+ goto leave;
+ }
+ }
+ else if (digptr)
+ {
+ if (digitp (p))
+ ;
+ else if (*p == ':')
+ {
+ datalen = atoi (digptr); /* FIXME: check for overflow. */
+ digptr = NULL;
+ if (datalen > n - 1)
+ {
+ *erroff = p - buffer;
+ /* Buffer too short. */
+ err = GPG_ERR_SEXP_STRING_TOO_LONG;
+ goto leave;
+ }
+ /* Make a new list entry. */
+ MAKE_SPACE (datalen);
+ *c.pos++ = ST_DATA;
+ STORE_LEN (c.pos, datalen);
+ memcpy (c.pos, p + 1, datalen);
+ c.pos += datalen;
+ n -= datalen;
+ p += datalen;
+ }
+ else if (*p == '\"')
+ {
+ digptr = NULL; /* We ignore the optional length. */
+ quoted = p;
+ quoted_esc = 0;
+ }
+ else if (*p == '#')
+ {
+ digptr = NULL; /* We ignore the optional length. */
+ hexfmt = p;
+ hexcount = 0;
+ }
+ else if (*p == '|')
+ {
+ digptr = NULL; /* We ignore the optional length. */
+ base64 = p;
+ b64count = 0;
+ }
+ else
+ {
+ *erroff = p - buffer;
+ err = GPG_ERR_SEXP_INV_LEN_SPEC;
+ goto leave;
+ }
+ }
+ else if (percent)
+ {
+ if (*p == 'm' || *p == 'M')
+ {
+ /* Insert an MPI. */
+ gcry_mpi_t m;
+ size_t nm = 0;
+ int mpifmt = *p == 'm'? GCRYMPI_FMT_STD: GCRYMPI_FMT_USG;
+
+ ARG_NEXT (m, gcry_mpi_t);
+
+ if (mpi_get_flag (m, GCRYMPI_FLAG_OPAQUE))
+ {
+ void *mp;
+ unsigned int nbits;
+
+ mp = mpi_get_opaque (m, &nbits);
+ nm = (nbits+7)/8;
+ if (mp && nm)
+ {
+ MAKE_SPACE (nm);
+ if (!_gcry_is_secure (c.sexp->d)
+ && mpi_get_flag (m, GCRYMPI_FLAG_SECURE))
+ {
+ /* We have to switch to secure allocation. */
+ gcry_sexp_t newsexp;
+ byte *newhead;
+
+ newsexp = xtrymalloc_secure (sizeof *newsexp
+ + c.allocated - 1);
+ if (!newsexp)
+ {
+ err = gpg_err_code_from_errno (errno);
+ goto leave;
+ }
+ newhead = newsexp->d;
+ memcpy (newhead, c.sexp->d, (c.pos - c.sexp->d));
+ c.pos = newhead + (c.pos - c.sexp->d);
+ xfree (c.sexp);
+ c.sexp = newsexp;
+ }
+
+ *c.pos++ = ST_DATA;
+ STORE_LEN (c.pos, nm);
+ memcpy (c.pos, mp, nm);
+ c.pos += nm;
+ }
+ }
+ else
+ {
+ if (mpifmt == GCRYMPI_FMT_USG && mpi_cmp_ui (m, 0) < 0)
+ {
+ err = GPG_ERR_INV_ARG;
+ goto leave;
+ }
+
+ err = _gcry_mpi_print (mpifmt, NULL, 0, &nm, m);
+ if (err)
+ goto leave;
+
+ MAKE_SPACE (nm);
+ if (!_gcry_is_secure (c.sexp->d)
+ && mpi_get_flag ( m, GCRYMPI_FLAG_SECURE))
+ {
+ /* We have to switch to secure allocation. */
+ gcry_sexp_t newsexp;
+ byte *newhead;
+
+ newsexp = xtrymalloc_secure (sizeof *newsexp
+ + c.allocated - 1);
+ if (!newsexp)
+ {
+ err = gpg_err_code_from_errno (errno);
+ goto leave;
+ }
+ newhead = newsexp->d;
+ memcpy (newhead, c.sexp->d, (c.pos - c.sexp->d));
+ c.pos = newhead + (c.pos - c.sexp->d);
+ xfree (c.sexp);
+ c.sexp = newsexp;
+ }
+
+ *c.pos++ = ST_DATA;
+ STORE_LEN (c.pos, nm);
+ err = _gcry_mpi_print (mpifmt, c.pos, nm, &nm, m);
+ if (err)
+ goto leave;
+ c.pos += nm;
+ }
+ }
+ else if (*p == 's')
+ {
+ /* Insert an string. */
+ const char *astr;
+ size_t alen;
+
+ ARG_NEXT (astr, const char *);
+ alen = strlen (astr);
+
+ MAKE_SPACE (alen);
+ *c.pos++ = ST_DATA;
+ STORE_LEN (c.pos, alen);
+ memcpy (c.pos, astr, alen);
+ c.pos += alen;
+ }
+ else if (*p == 'b')
+ {
+ /* Insert a memory buffer. */
+ const char *astr;
+ int alen;
+
+ ARG_NEXT (alen, int);
+ ARG_NEXT (astr, const char *);
+
+ if (alen < 0)
+ {
+ *erroff = p - buffer;
+ err = GPG_ERR_INV_ARG;
+ goto leave;
+ }
+
+ MAKE_SPACE (alen);
+ if (alen
+ && !_gcry_is_secure (c.sexp->d)
+ && _gcry_is_secure (astr))
+ {
+ /* We have to switch to secure allocation. */
+ gcry_sexp_t newsexp;
+ byte *newhead;
+
+ newsexp = xtrymalloc_secure (sizeof *newsexp
+ + c.allocated - 1);
+ if (!newsexp)
+ {
+ err = gpg_err_code_from_errno (errno);
+ goto leave;
+ }
+ newhead = newsexp->d;
+ memcpy (newhead, c.sexp->d, (c.pos - c.sexp->d));
+ c.pos = newhead + (c.pos - c.sexp->d);
+ xfree (c.sexp);
+ c.sexp = newsexp;
+ }
+
+ *c.pos++ = ST_DATA;
+ STORE_LEN (c.pos, alen);
+ memcpy (c.pos, astr, alen);
+ c.pos += alen;
+ }
+ else if (*p == 'd')
+ {
+ /* Insert an integer as string. */
+ int aint;
+ size_t alen;
+ char buf[35];
+
+ ARG_NEXT (aint, int);
+ snprintf (buf, sizeof buf, "%d", aint);
+ alen = strlen (buf);
+ MAKE_SPACE (alen);
+ *c.pos++ = ST_DATA;
+ STORE_LEN (c.pos, alen);
+ memcpy (c.pos, buf, alen);
+ c.pos += alen;
+ }
+ else if (*p == 'u')
+ {
+ /* Insert an unsigned integer as string. */
+ unsigned int aint;
+ size_t alen;
+ char buf[35];
+
+ ARG_NEXT (aint, unsigned int);
+ snprintf (buf, sizeof buf, "%u", aint);
+ alen = strlen (buf);
+ MAKE_SPACE (alen);
+ *c.pos++ = ST_DATA;
+ STORE_LEN (c.pos, alen);
+ memcpy (c.pos, buf, alen);
+ c.pos += alen;
+ }
+ else if (*p == 'S')
+ {
+ /* Insert a gcry_sexp_t. */
+ gcry_sexp_t asexp;
+ size_t alen, aoff;
+
+ ARG_NEXT (asexp, gcry_sexp_t);
+ alen = get_internal_buffer (asexp, &aoff);
+ if (alen)
+ {
+ MAKE_SPACE (alen);
+ memcpy (c.pos, asexp->d + aoff, alen);
+ c.pos += alen;
+ }
+ }
+ else
+ {
+ *erroff = p - buffer;
+ /* Invalid format specifier. */
+ err = GPG_ERR_SEXP_INV_LEN_SPEC;
+ goto leave;
+ }
+ percent = NULL;
+ }
+ else if (*p == '(')
+ {
+ if (disphint)
+ {
+ *erroff = p - buffer;
+ /* Open display hint. */
+ err = GPG_ERR_SEXP_UNMATCHED_DH;
+ goto leave;
+ }
+ MAKE_SPACE (0);
+ *c.pos++ = ST_OPEN;
+ level++;
+ }
+ else if (*p == ')')
+ {
+ /* Walk up. */
+ if (disphint)
+ {
+ *erroff = p - buffer;
+ /* Open display hint. */
+ err = GPG_ERR_SEXP_UNMATCHED_DH;
+ goto leave;
+ }
+
+ if (level == 0)
+ {
+ *erroff = p - buffer;
+ err = GPG_ERR_SEXP_UNMATCHED_PAREN;
+ goto leave;
+ }
+ MAKE_SPACE (0);
+ *c.pos++ = ST_CLOSE;
+ level--;
+ }
+ else if (*p == '\"')
+ {
+ quoted = p;
+ quoted_esc = 0;
+ }
+ else if (*p == '#')
+ {
+ hexfmt = p;
+ hexcount = 0;
+ }
+ else if (*p == '|')
+ {
+ base64 = p;
+ b64count = 0;
+ }
+ else if (*p == '[')
+ {
+ if (disphint)
+ {
+ *erroff = p - buffer;
+ /* Open display hint. */
+ err = GPG_ERR_SEXP_NESTED_DH;
+ goto leave;
+ }
+ disphint = p;
+ }
+ else if (*p == ']')
+ {
+ if (!disphint)
+ {
+ *erroff = p - buffer;
+ /* Open display hint. */
+ err = GPG_ERR_SEXP_UNMATCHED_DH;
+ goto leave;
+ }
+ disphint = NULL;
+ }
+ else if (digitp (p))
+ {
+ if (*p == '0')
+ {
+ /* A length may not begin with zero. */
+ *erroff = p - buffer;
+ err = GPG_ERR_SEXP_ZERO_PREFIX;
+ goto leave;
+ }
+ digptr = p;
+ }
+ else if (strchr (tokenchars, *p))
+ tokenp = p;
+ else if (whitespacep (p))
+ ;
+ else if (*p == '{')
+ {
+ /* fixme: handle rescanning: we can do this by saving our
+ current state and start over at p+1 -- Hmmm. At this
+ point here we are in a well defined state, so we don't
+ need to save it. Great. */
+ *erroff = p - buffer;
+ err = GPG_ERR_SEXP_UNEXPECTED_PUNC;
+ goto leave;
+ }
+ else if (strchr ("&\\", *p))
+ {
+ /* Reserved punctuation. */
+ *erroff = p - buffer;
+ err = GPG_ERR_SEXP_UNEXPECTED_PUNC;
+ goto leave;
+ }
+ else if (argflag && (*p == '%'))
+ percent = p;
+ else
+ {
+ /* Bad or unavailable. */
+ *erroff = p - buffer;
+ err = GPG_ERR_SEXP_BAD_CHARACTER;
+ goto leave;
+ }
+ }
+ MAKE_SPACE (0);
+ *c.pos++ = ST_STOP;
+
+ if (level && !err)
+ err = GPG_ERR_SEXP_UNMATCHED_PAREN;
+
+ leave:
+ if (err)
+ {
+ /* Error -> deallocate. */
+ if (c.sexp)
+ {
+ /* Extra paranoid wipe on error. */
+ if (_gcry_is_secure (c.sexp))
+ wipememory (c.sexp, sizeof (struct gcry_sexp) + c.allocated - 1);
+ xfree (c.sexp);
+ }
+ }
+ else
+ *retsexp = normalize (c.sexp);
+
+ return err;
+#undef MAKE_SPACE
+#undef STORE_LEN
+}
+
+
+static gpg_err_code_t
+do_sexp_sscan (gcry_sexp_t *retsexp, size_t *erroff,
+ const char *buffer, size_t length, int argflag,
+ void **arg_list, ...)
+{
+ gcry_err_code_t rc;
+ va_list arg_ptr;
+
+ va_start (arg_ptr, arg_list);
+ rc = do_vsexp_sscan (retsexp, erroff, buffer, length, argflag,
+ arg_list, arg_ptr);
+ va_end (arg_ptr);
+
+ return rc;
+}
+
+
+gpg_err_code_t
+_gcry_sexp_build (gcry_sexp_t *retsexp, size_t *erroff, const char *format, ...)
+{
+ gcry_err_code_t rc;
+ va_list arg_ptr;
+
+ va_start (arg_ptr, format);
+ rc = do_vsexp_sscan (retsexp, erroff, format, strlen(format), 1,
+ NULL, arg_ptr);
+ va_end (arg_ptr);
+
+ return rc;
+}
+
+
+gcry_err_code_t
+_gcry_sexp_vbuild (gcry_sexp_t *retsexp, size_t *erroff,
+ const char *format, va_list arg_ptr)
+{
+ return do_vsexp_sscan (retsexp, erroff, format, strlen(format), 1,
+ NULL, arg_ptr);
+}
+
+
+/* Like gcry_sexp_build, but uses an array instead of variable
+ function arguments. */
+gcry_err_code_t
+_gcry_sexp_build_array (gcry_sexp_t *retsexp, size_t *erroff,
+ const char *format, void **arg_list)
+{
+ return do_sexp_sscan (retsexp, erroff, format, strlen(format), 1, arg_list);
+}
+
+
+gcry_err_code_t
+_gcry_sexp_sscan (gcry_sexp_t *retsexp, size_t *erroff,
+ const char *buffer, size_t length)
+{
+ return do_sexp_sscan (retsexp, erroff, buffer, length, 0, NULL);
+}
+
+
+/* Figure out a suitable encoding for BUFFER of LENGTH.
+ Returns: 0 = Binary
+ 1 = String possible
+ 2 = Token possible
+*/
+static int
+suitable_encoding (const unsigned char *buffer, size_t length)
+{
+ const unsigned char *s;
+ int maybe_token = 1;
+
+ if (!length)
+ return 1;
+
+ if (*buffer & 0x80)
+ return 0; /* If the MSB is set we assume that buffer represents a
+ negative number. */
+ if (!*buffer)
+ return 0; /* Starting with a zero is pretty much a binary string. */
+
+ for (s=buffer; length; s++, length--)
+ {
+ if ( (*s < 0x20 || (*s >= 0x7f && *s <= 0xa0))
+ && !strchr ("\b\t\v\n\f\r\"\'\\", *s))
+ return 0; /*binary*/
+ if ( maybe_token
+ && !alphap (s) && !digitp (s) && !strchr (TOKEN_SPECIALS, *s))
+ maybe_token = 0;
+ }
+ s = buffer;
+ if ( maybe_token && !digitp (s) )
+ return 2;
+ return 1;
+}
+
+
+static int
+convert_to_hex (const unsigned char *src, size_t len, char *dest)
+{
+ int i;
+
+ if (dest)
+ {
+ *dest++ = '#';
+ for (i=0; i < len; i++, dest += 2 )
+ snprintf (dest, 3, "%02X", src[i]);
+ *dest++ = '#';
+ }
+ return len*2+2;
+}
+
+static int
+convert_to_string (const unsigned char *s, size_t len, char *dest)
+{
+ if (dest)
+ {
+ char *p = dest;
+ *p++ = '\"';
+ for (; len; len--, s++ )
+ {
+ switch (*s)
+ {
+ case '\b': *p++ = '\\'; *p++ = 'b'; break;
+ case '\t': *p++ = '\\'; *p++ = 't'; break;
+ case '\v': *p++ = '\\'; *p++ = 'v'; break;
+ case '\n': *p++ = '\\'; *p++ = 'n'; break;
+ case '\f': *p++ = '\\'; *p++ = 'f'; break;
+ case '\r': *p++ = '\\'; *p++ = 'r'; break;
+ case '\"': *p++ = '\\'; *p++ = '\"'; break;
+ case '\'': *p++ = '\\'; *p++ = '\''; break;
+ case '\\': *p++ = '\\'; *p++ = '\\'; break;
+ default:
+ if ( (*s < 0x20 || (*s >= 0x7f && *s <= 0xa0)))
+ {
+ snprintf (p, 5, "\\x%02x", *s);
+ p += 4;
+ }
+ else
+ *p++ = *s;
+ }
+ }
+ *p++ = '\"';
+ return p - dest;
+ }
+ else
+ {
+ int count = 2;
+ for (; len; len--, s++ )
+ {
+ switch (*s)
+ {
+ case '\b':
+ case '\t':
+ case '\v':
+ case '\n':
+ case '\f':
+ case '\r':
+ case '\"':
+ case '\'':
+ case '\\': count += 2; break;
+ default:
+ if ( (*s < 0x20 || (*s >= 0x7f && *s <= 0xa0)))
+ count += 4;
+ else
+ count++;
+ }
+ }
+ return count;
+ }
+}
+
+
+
+static int
+convert_to_token (const unsigned char *src, size_t len, char *dest)
+{
+ if (dest)
+ memcpy (dest, src, len);
+ return len;
+}
+
+
+/****************
+ * Print SEXP to buffer using the MODE. Returns the length of the
+ * SEXP in buffer or 0 if the buffer is too short (We have at least an
+ * empty list consisting of 2 bytes). If a buffer of NULL is provided,
+ * the required length is returned.
+ */
+size_t
+_gcry_sexp_sprint (const gcry_sexp_t list, int mode,
+ void *buffer, size_t maxlength )
+{
+ static unsigned char empty[3] = { ST_OPEN, ST_CLOSE, ST_STOP };
+ const unsigned char *s;
+ char *d;
+ DATALEN n;
+ char numbuf[20];
+ size_t len = 0;
+ int i, indent = 0;
+
+ s = list? list->d : empty;
+ d = buffer;
+ while ( *s != ST_STOP )
+ {
+ switch ( *s )
+ {
+ case ST_OPEN:
+ s++;
+ if ( mode != GCRYSEXP_FMT_CANON )
+ {
+ if (indent)
+ len++;
+ len += indent;
+ }
+ len++;
+ if ( buffer )
+ {
+ if ( len >= maxlength )
+ return 0;
+ if ( mode != GCRYSEXP_FMT_CANON )
+ {
+ if (indent)
+ *d++ = '\n';
+ for (i=0; i < indent; i++)
+ *d++ = ' ';
+ }
+ *d++ = '(';
+ }
+ indent++;
+ break;
+ case ST_CLOSE:
+ s++;
+ len++;
+ if ( buffer )
+ {
+ if ( len >= maxlength )
+ return 0;
+ *d++ = ')';
+ }
+ indent--;
+ if (*s != ST_OPEN && *s != ST_STOP && mode != GCRYSEXP_FMT_CANON)
+ {
+ len++;
+ len += indent;
+ if (buffer)
+ {
+ if (len >= maxlength)
+ return 0;
+ *d++ = '\n';
+ for (i=0; i < indent; i++)
+ *d++ = ' ';
+ }
+ }
+ break;
+ case ST_DATA:
+ s++;
+ memcpy ( &n, s, sizeof n ); s += sizeof n;
+ if (mode == GCRYSEXP_FMT_ADVANCED)
+ {
+ int type;
+ size_t nn;
+
+ switch ( (type=suitable_encoding (s, n)))
+ {
+ case 1: nn = convert_to_string (s, n, NULL); break;
+ case 2: nn = convert_to_token (s, n, NULL); break;
+ default: nn = convert_to_hex (s, n, NULL); break;
+ }
+ len += nn;
+ if (buffer)
+ {
+ if (len >= maxlength)
+ return 0;
+ switch (type)
+ {
+ case 1: convert_to_string (s, n, d); break;
+ case 2: convert_to_token (s, n, d); break;
+ default: convert_to_hex (s, n, d); break;
+ }
+ d += nn;
+ }
+ if (s[n] != ST_CLOSE)
+ {
+ len++;
+ if (buffer)
+ {
+ if (len >= maxlength)
+ return 0;
+ *d++ = ' ';
+ }
+ }
+ }
+ else
+ {
+ snprintf (numbuf, sizeof numbuf, "%u:", (unsigned int)n );
+ len += strlen (numbuf) + n;
+ if ( buffer )
+ {
+ if ( len >= maxlength )
+ return 0;
+ d = stpcpy ( d, numbuf );
+ memcpy ( d, s, n ); d += n;
+ }
+ }
+ s += n;
+ break;
+ default:
+ BUG ();
+ }
+ }
+ if ( mode != GCRYSEXP_FMT_CANON )
+ {
+ len++;
+ if (buffer)
+ {
+ if ( len >= maxlength )
+ return 0;
+ *d++ = '\n';
+ }
+ }
+ if (buffer)
+ {
+ if ( len >= maxlength )
+ return 0;
+ *d++ = 0; /* for convenience we make a C string */
+ }
+ else
+ len++; /* we need one byte more for this */
+
+ return len;
+}
+
+
+/* Scan a canonical encoded buffer with implicit length values and
+ return the actual length this S-expression uses. For a valid S-Exp
+ it should never return 0. If LENGTH is not zero, the maximum
+ length to scan is given - this can be used for syntax checks of
+ data passed from outside. errorcode and erroff may both be passed as
+ NULL. */
+size_t
+_gcry_sexp_canon_len (const unsigned char *buffer, size_t length,
+ size_t *erroff, gcry_err_code_t *errcode)
+{
+ const unsigned char *p;
+ const unsigned char *disphint = NULL;
+ unsigned int datalen = 0;
+ size_t dummy_erroff;
+ gcry_err_code_t dummy_errcode;
+ size_t count = 0;
+ int level = 0;
+
+ if (!erroff)
+ erroff = &dummy_erroff;
+ if (!errcode)
+ errcode = &dummy_errcode;
+
+ *errcode = GPG_ERR_NO_ERROR;
+ *erroff = 0;
+ if (!buffer)
+ return 0;
+ if (*buffer != '(')
+ {
+ *errcode = GPG_ERR_SEXP_NOT_CANONICAL;
+ return 0;
+ }
+
+ for (p=buffer; ; p++, count++ )
+ {
+ if (length && count >= length)
+ {
+ *erroff = count;
+ *errcode = GPG_ERR_SEXP_STRING_TOO_LONG;
+ return 0;
+ }
+
+ if (datalen)
+ {
+ if (*p == ':')
+ {
+ if (length && (count+datalen) >= length)
+ {
+ *erroff = count;
+ *errcode = GPG_ERR_SEXP_STRING_TOO_LONG;
+ return 0;
+ }
+ count += datalen;
+ p += datalen;
+ datalen = 0;
+ }
+ else if (digitp(p))
+ datalen = datalen*10 + atoi_1(p);
+ else
+ {
+ *erroff = count;
+ *errcode = GPG_ERR_SEXP_INV_LEN_SPEC;
+ return 0;
+ }
+ }
+ else if (*p == '(')
+ {
+ if (disphint)
+ {
+ *erroff = count;
+ *errcode = GPG_ERR_SEXP_UNMATCHED_DH;
+ return 0;
+ }
+ level++;
+ }
+ else if (*p == ')')
+ { /* walk up */
+ if (!level)
+ {
+ *erroff = count;
+ *errcode = GPG_ERR_SEXP_UNMATCHED_PAREN;
+ return 0;
+ }
+ if (disphint)
+ {
+ *erroff = count;
+ *errcode = GPG_ERR_SEXP_UNMATCHED_DH;
+ return 0;
+ }
+ if (!--level)
+ return ++count; /* ready */
+ }
+ else if (*p == '[')
+ {
+ if (disphint)
+ {
+ *erroff = count;
+ *errcode = GPG_ERR_SEXP_NESTED_DH;
+ return 0;
+ }
+ disphint = p;
+ }
+ else if (*p == ']')
+ {
+ if ( !disphint )
+ {
+ *erroff = count;
+ *errcode = GPG_ERR_SEXP_UNMATCHED_DH;
+ return 0;
+ }
+ disphint = NULL;
+ }
+ else if (digitp (p) )
+ {
+ if (*p == '0')
+ {
+ *erroff = count;
+ *errcode = GPG_ERR_SEXP_ZERO_PREFIX;
+ return 0;
+ }
+ datalen = atoi_1 (p);
+ }
+ else if (*p == '&' || *p == '\\')
+ {
+ *erroff = count;
+ *errcode = GPG_ERR_SEXP_UNEXPECTED_PUNC;
+ return 0;
+ }
+ else
+ {
+ *erroff = count;
+ *errcode = GPG_ERR_SEXP_BAD_CHARACTER;
+ return 0;
+ }
+ }
+}
+
+
+/* Extract MPIs from an s-expression using a list of parameters. The
+ * names of these parameters are given by the string LIST. Some
+ * special characters may be given to control the conversion:
+ *
+ * + :: Switch to unsigned integer format (default).
+ * - :: Switch to standard signed format.
+ * / :: Switch to opaque format
+ * & :: Switch to buffer descriptor mode - see below.
+ * %s :: Switch to allocated string arguments.
+ * %#s :: Switch to allocated string arguments for a list of string flags.
+ * %u :: Switch to unsigned integer arguments.
+ * %lu :: Switch to unsigned long integer arguments.
+ * %zu :: Switch to size_t arguments.
+ * %d :: Switch to signed integer arguments.
+ * %ld :: Switch to signed long integer arguments.
+ * ? :: The previous parameter is optional.
+ *
+ * In general parameter names are single letters. To use a string for
+ * a parameter name, enclose the name in single quotes.
+ *
+ * Unless in gcry_buffer_t mode for each parameter name a pointer to
+ * an MPI variable is expected that must be set to NULL prior to
+ * invoking this function, and finally a NULL is expected. Example:
+ *
+ * _gcry_sexp_extract_param (key, NULL, "n/x+ed",
+ * &mpi_n, &mpi_x, &mpi_e, NULL)
+ *
+ * This stores the parameter "N" from KEY as an unsigned MPI into
+ * MPI_N, the parameter "X" as an opaque MPI into MPI_X, and the
+ * parameter "E" again as an unsigned MPI into MPI_E.
+ *
+ * If in buffer descriptor mode a pointer to gcry_buffer_t descriptor
+ * is expected instead of a pointer to an MPI. The caller may use two
+ * different operation modes: If the DATA field of the provided buffer
+ * descriptor is NULL, the function allocates a new buffer and stores
+ * it at DATA; the other fields are set accordingly with OFF being 0.
+ * If DATA is not NULL, the function assumes that DATA, SIZE, and OFF
+ * describe a buffer where to but the data; on return the LEN field
+ * receives the number of bytes copied to that buffer; if the buffer
+ * is too small, the function immediately returns with an error code
+ * (and LEN set to 0).
+ *
+ * For a flag list ("%#s") which has other lists as elements these
+ * sub-lists are skipped and a indicated by "()" in the output.
+ *
+ * PATH is an optional string used to locate a token. The exclamation
+ * mark separated tokens are used to via gcry_sexp_find_token to find
+ * a start point inside SEXP.
+ *
+ * The function returns 0 on success. On error an error code is
+ * returned, all passed MPIs that might have been allocated up to this
+ * point are deallocated and set to NULL, and all passed buffers are
+ * either truncated if the caller supplied the buffer, or deallocated
+ * if the function allocated the buffer.
+ */
+gpg_err_code_t
+_gcry_sexp_vextract_param (gcry_sexp_t sexp, const char *path,
+ const char *list, va_list arg_ptr)
+{
+ gpg_err_code_t rc;
+ const char *s, *s2;
+ void **array[20];
+ char arrayisdesc[20];
+ int idx, i;
+ gcry_sexp_t l1 = NULL;
+ int mode = '+'; /* Default to GCRYMPI_FMT_USG. */
+ int submode = 0;
+ gcry_sexp_t freethis = NULL;
+ char *tmpstr = NULL;
+
+ /* Values in ARRAYISDESC describing what the ARRAY holds.
+ * 0 - MPI
+ * 1 - gcry_buffer_t provided by caller.
+ * 2 - gcry_buffer_t allocated by us.
+ * 's' - String allocated by us.
+ * 'x' - Ignore
+ */
+ memset (arrayisdesc, 0, sizeof arrayisdesc);
+
+ /* First copy all the args into an array. This is required so that
+ we are able to release already allocated MPIs if later an error
+ was found. */
+ for (s=list, idx=0; *s && idx < DIM (array); s++)
+ {
+ if (*s == '&' || *s == '+' || *s == '-' || *s == '/' || *s == '?')
+ ;
+ else if (*s == '%')
+ {
+ s++;
+ if (*s == 'l' && (s[1] == 'u' || s[1] == 'd'))
+ s++;
+ else if (*s == 'z' && s[1] == 'u')
+ s++;
+ else if (*s == '#' && s[1] == 's')
+ s++;
+ continue;
+ }
+ else if (whitespacep (s))
+ ;
+ else
+ {
+ if (*s == '\'')
+ {
+ s++;
+ s2 = strchr (s, '\'');
+ if (!s2 || s2 == s)
+ {
+ /* Closing quote not found or empty string. */
+ return GPG_ERR_SYNTAX;
+ }
+ s = s2;
+ }
+ array[idx] = va_arg (arg_ptr, void *);
+ if (!array[idx])
+ return GPG_ERR_MISSING_VALUE; /* NULL pointer given. */
+ idx++;
+ }
+ }
+ if (*s)
+ return GPG_ERR_LIMIT_REACHED; /* Too many list elements. */
+ if (va_arg (arg_ptr, gcry_mpi_t *))
+ return GPG_ERR_INV_ARG; /* Not enough list elemends. */
+
+ /* Drill down. */
+ while (path && *path)
+ {
+ size_t n;
+
+ s = strchr (path, '!');
+ if (s == path)
+ {
+ rc = GPG_ERR_NOT_FOUND;
+ goto cleanup;
+ }
+ n = s? s - path : 0;
+ l1 = _gcry_sexp_find_token (sexp, path, n);
+ if (!l1)
+ {
+ rc = GPG_ERR_NOT_FOUND;
+ goto cleanup;
+ }
+ sexp = l1; l1 = NULL;
+ sexp_release (freethis);
+ freethis = sexp;
+ if (n)
+ path += n + 1;
+ else
+ path = NULL;
+ }
+
+
+ /* Now extract all parameters. */
+ for (s=list, idx=0; *s; s++)
+ {
+ if (*s == '&' || *s == '+' || *s == '-' || *s == '/')
+ mode = *s;
+ else if (*s == '%')
+ {
+ s++;
+ if (!*s)
+ continue; /* Ignore at end of format. */
+ if (*s == 's' || *s == 'd' || *s == 'u')
+ {
+ mode = *s;
+ submode = 0;
+ }
+ else if (*s == 'l' && (s[1] == 'u' || s[1] == 'd'))
+ {
+ mode = s[1];
+ submode = 'l';
+ s++;
+ }
+ else if (*s == 'z' && s[1] == 'u')
+ {
+ mode = s[1];
+ submode = 'z';
+ s++;
+ }
+ else if (*s == '#' && s[1] == 's')
+ {
+ mode = s[1];
+ submode = '#';
+ s++;
+ }
+ continue;
+ }
+ else if (whitespacep (s))
+ ;
+ else if (*s == '?')
+ ; /* Only used via lookahead. */
+ else
+ {
+ if (*s == '\'')
+ {
+ /* Find closing quote, find token, set S to closing quote. */
+ s++;
+ s2 = strchr (s, '\'');
+ if (!s2 || s2 == s)
+ {
+ /* Closing quote not found or empty string. */
+ rc = GPG_ERR_SYNTAX;
+ goto cleanup;
+ }
+ l1 = _gcry_sexp_find_token (sexp, s, s2 - s);
+ s = s2;
+ }
+ else
+ l1 = _gcry_sexp_find_token (sexp, s, 1);
+
+ if (!l1 && s[1] == '?')
+ {
+ /* Optional element not found. */
+ if (mode == '&')
+ {
+ gcry_buffer_t *spec = (gcry_buffer_t*)array[idx];
+ if (!spec->data)
+ {
+ spec->size = 0;
+ spec->off = 0;
+ }
+ spec->len = 0;
+ }
+ else if (mode == 's')
+ {
+ *array[idx] = NULL;
+ arrayisdesc[idx] = 's';
+ }
+ else if (mode == 'd')
+ {
+ if (submode == 'l')
+ *(long *)array[idx] = 0;
+ else
+ *(int *)array[idx] = 0;
+ arrayisdesc[idx] = 'x';
+ }
+ else if (mode == 'u')
+ {
+ if (submode == 'l')
+ *(unsigned long *)array[idx] = 0;
+ else if (submode == 'z')
+ *(size_t *)array[idx] = 0;
+ else
+ *(unsigned int *)array[idx] = 0;
+ arrayisdesc[idx] = 'x';
+ }
+ else
+ *array[idx] = NULL;
+ }
+ else if (!l1)
+ {
+ rc = GPG_ERR_NO_OBJ; /* List element not found. */
+ goto cleanup;
+ }
+ else
+ {
+ if (mode == '&')
+ {
+ gcry_buffer_t *spec = (gcry_buffer_t*)array[idx];
+
+ if (spec->data)
+ {
+ const char *pbuf;
+ size_t nbuf;
+
+ pbuf = _gcry_sexp_nth_data (l1, 1, &nbuf);
+ if (!pbuf || !nbuf)
+ {
+ rc = GPG_ERR_INV_OBJ;
+ goto cleanup;
+ }
+ if (spec->off + nbuf > spec->size)
+ {
+ rc = GPG_ERR_BUFFER_TOO_SHORT;
+ goto cleanup;
+ }
+ memcpy ((char*)spec->data + spec->off, pbuf, nbuf);
+ spec->len = nbuf;
+ arrayisdesc[idx] = 1;
+ }
+ else
+ {
+ spec->data = _gcry_sexp_nth_buffer (l1, 1, &spec->size);
+ if (!spec->data)
+ {
+ rc = GPG_ERR_INV_OBJ; /* Or out of core. */
+ goto cleanup;
+ }
+ spec->len = spec->size;
+ spec->off = 0;
+ arrayisdesc[idx] = 2;
+ }
+ }
+ else if (mode == 's')
+ {
+ if (submode == '#')
+ {
+ size_t needed = 0;
+ size_t n;
+ int l1len;
+ char *p;
+
+ l1len = l1? sexp_length (l1) : 0;
+ for (i = 1; i < l1len; i++)
+ {
+ s2 = sexp_nth_data (l1, i, &n);
+ if (!s2)
+ n = 2; /* Not a data element; we use "()". */
+ needed += n + 1;
+ }
+ if (!needed)
+ {
+ *array[idx] = p = xtrymalloc (1);
+ if (p)
+ *p = 0;
+ }
+ else if ((*array[idx] = p = xtrymalloc (needed)))
+ {
+ for (i = 1; i < l1len; i++)
+ {
+ s2 = sexp_nth_data (l1, i, &n);
+ if (!s2)
+ memcpy (p, "()", (n=2));
+ else
+ memcpy (p, s2, n);
+ p[n] = ' ';
+ p += n + 1;
+ }
+ if (p != *array[idx])
+ p[-1] = 0;
+ }
+ }
+ else
+ *array[idx] = _gcry_sexp_nth_string (l1, 1);
+ if (!*array[idx])
+ {
+ rc = gpg_err_code_from_syserror ();
+ goto cleanup;
+ }
+ arrayisdesc[idx] = 's';
+ }
+ else if (mode == 'd')
+ {
+ long along;
+
+ xfree (tmpstr);
+ tmpstr = _gcry_sexp_nth_string (l1, 1);
+ if (!tmpstr)
+ {
+ rc = gpg_err_code_from_syserror ();
+ goto cleanup;
+ }
+ along = strtol (tmpstr, NULL, 10);
+ if (submode == 'l')
+ *(long *)array[idx] = along;
+ else
+ *(int *)array[idx] = along;
+ arrayisdesc[idx] = 'x';
+ }
+ else if (mode == 'u')
+ {
+ long aulong;
+
+ xfree (tmpstr);
+ tmpstr = _gcry_sexp_nth_string (l1, 1);
+ if (!tmpstr)
+ {
+ rc = gpg_err_code_from_syserror ();
+ goto cleanup;
+ }
+ aulong = strtoul (tmpstr, NULL, 10);
+ if (submode == 'l')
+ *(unsigned long *)array[idx] = aulong;
+ else if (submode == 'z')
+ *(size_t *)array[idx] = aulong;
+ else
+ *(unsigned int *)array[idx] = aulong;
+ arrayisdesc[idx] = 'x';
+ }
+ else
+ {
+ if (mode == '/')
+ *array[idx] = _gcry_sexp_nth_mpi (l1,1,GCRYMPI_FMT_OPAQUE);
+ else if (mode == '-')
+ *array[idx] = _gcry_sexp_nth_mpi (l1,1,GCRYMPI_FMT_STD);
+ else
+ *array[idx] = _gcry_sexp_nth_mpi (l1,1,GCRYMPI_FMT_USG);
+ if (!*array[idx])
+ {
+ rc = GPG_ERR_INV_OBJ; /* Conversion failed. */
+ goto cleanup;
+ }
+ }
+ sexp_release (l1); l1 = NULL;
+ }
+ idx++;
+ }
+ }
+
+ xfree (tmpstr);
+ sexp_release (freethis);
+ return 0;
+
+ cleanup:
+ xfree (tmpstr);
+ sexp_release (freethis);
+ sexp_release (l1);
+ while (idx--)
+ {
+ if (!arrayisdesc[idx])
+ {
+ _gcry_mpi_release (*array[idx]);
+ *array[idx] = NULL;
+ }
+ else if (arrayisdesc[idx] == 1)
+ {
+ /* Caller provided buffer. */
+ gcry_buffer_t *spec = (gcry_buffer_t*)array[idx];
+ spec->len = 0;
+ }
+ else if (arrayisdesc[idx] == 2)
+ {
+ /* We might have allocated a buffer. */
+ gcry_buffer_t *spec = (gcry_buffer_t*)array[idx];
+ xfree (spec->data);
+ spec->data = NULL;
+ spec->size = spec->off = spec->len = 0;
+ }
+ else if (arrayisdesc[idx] == 's')
+ {
+ /* We might have allocated a buffer. */
+ xfree (*array[idx]);
+ *array[idx] = NULL;
+ }
+ }
+ return rc;
+}
+
+gpg_err_code_t
+_gcry_sexp_extract_param (gcry_sexp_t sexp, const char *path,
+ const char *list, ...)
+{
+ gcry_err_code_t rc;
+ va_list arg_ptr;
+
+ va_start (arg_ptr, list);
+ rc = _gcry_sexp_vextract_param (sexp, path, list, arg_ptr);
+ va_end (arg_ptr);
+ return rc;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-08-02 13:04:42 +0000