Adding upstream version 3.4.23.upstream/3.4.23upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 563 insertions, 0 deletions

diff --git a/src/util/attr_scan0.c b/src/util/attr_scan0.c
new file mode 100644
index 0000000..f465de9
--- /dev/null
+++ b/src/util/attr_scan0.c
@@ -0,0 +1,563 @@
+/*++
+/* NAME
+/*	attr_scan0 3
+/* SUMMARY
+/*	recover attributes from byte stream
+/* SYNOPSIS
+/*	#include <attr.h>
+/*
+/*	int	attr_scan0(fp, flags, type, name, ..., ATTR_TYPE_END)
+/*	VSTREAM	*fp;
+/*	int	flags;
+/*	int	type;
+/*	char	*name;
+/*
+/*	int	attr_vscan0(fp, flags, ap)
+/*	VSTREAM	*fp;
+/*	int	flags;
+/*	va_list	ap;
+/*
+/*	int	attr_scan_more0(fp)
+/*	VSTREAM	*fp;
+/* DESCRIPTION
+/*	attr_scan0() takes zero or more (name, value) request attributes
+/*	and recovers the attribute values from the byte stream that was
+/*	possibly generated by attr_print0().
+/*
+/*	attr_vscan0() provides an alternative interface that is convenient
+/*	for calling from within a variadic function.
+/*
+/*	attr_scan_more0() returns 0 when a terminator is found (and
+/*	consumes that terminator), returns 1 when more input is
+/*	expected (without consuming input), and returns -1 otherwise
+/*	(error).
+/*
+/*	The input stream is formatted as follows, where (item)* stands
+/*	for zero or more instances of the specified item, and where
+/*	(item1 | item2) stands for choice:
+/*
+/* .in +5
+/*	attr-list :== (simple-attr | multi-attr)* null
+/* .br
+/*	multi-attr :== "{" null simple-attr* "}" null
+/* .br
+/*	simple-attr :== attr-name null attr-value null
+/* .br
+/*	attr-name :== any string not containing null
+/* .br
+/*	attr-value :== any string not containing null
+/* .br
+/*	null :== the ASCII null character
+/* .in
+/*
+/*	All attribute names and attribute values are sent as null terminated
+/*	strings. Each string must be no longer than 4*var_line_limit
+/*	characters including the terminator.
+/*	These formatting rules favor implementations in C.
+/*
+/*	Normally, attributes must be received in the sequence as specified with
+/*	the attr_scan0() argument list.  The input stream may contain additional
+/*	attributes at any point in the input stream, including additional
+/*	instances of requested attributes.
+/*
+/*	Additional input attributes or input attribute instances are silently
+/*	skipped over, unless the ATTR_FLAG_EXTRA processing flag is specified
+/*	(see below). This allows for some flexibility in the evolution of
+/*	protocols while still providing the option of being strict where
+/*	this is desirable.
+/*
+/*	Arguments:
+/* .IP fp
+/*	Stream to recover the input attributes from.
+/* .IP flags
+/*	The bit-wise OR of zero or more of the following.
+/* .RS
+/* .IP ATTR_FLAG_MISSING
+/*	Log a warning when the input attribute list terminates before all
+/*	requested attributes are recovered. It is always an error when the
+/*	input stream ends without the newline attribute list terminator.
+/* .IP ATTR_FLAG_EXTRA
+/*	Log a warning and stop attribute recovery when the input stream
+/*	contains an attribute that was not requested. This includes the
+/*	case of additional instances of a requested attribute.
+/* .IP ATTR_FLAG_MORE
+/*	After recovering the requested attributes, leave the input stream
+/*	in a state that is usable for more attr_scan0() operations from the
+/*	same input attribute list.
+/*	By default, attr_scan0() skips forward past the input attribute list
+/*	terminator.
+/* .IP ATTR_FLAG_STRICT
+/*	For convenience, this value combines both ATTR_FLAG_MISSING and
+/*	ATTR_FLAG_EXTRA.
+/* .IP ATTR_FLAG_NONE
+/*	For convenience, this value requests none of the above.
+/* .RE
+/* .IP List of attributes followed by terminator:
+/* .RS
+/* .IP "RECV_ATTR_INT(const char *name, int *ptr)"
+/*	This argument is followed by an attribute name and an integer pointer.
+/* .IP "RECV_ATTR_LONG(const char *name, long *ptr)"
+/*	This argument is followed by an attribute name and a long pointer.
+/* .IP "RECV_ATTR_STR(const char *name, VSTRING *vp)"
+/*	This argument is followed by an attribute name and a VSTRING pointer.
+/* .IP "RECV_ATTR_DATA(const char *name, VSTRING *vp)"
+/*	This argument is followed by an attribute name and a VSTRING pointer.
+/* .IP "RECV_ATTR_FUNC(ATTR_SCAN_SLAVE_FN, void *data)"
+/*	This argument is followed by a function pointer and a generic data
+/*	pointer. The caller-specified function returns < 0 in case of
+/*	error.
+/* .IP "RECV_ATTR_HASH(HTABLE *table)"
+/* .IP "RECV_ATTR_NAMEVAL(NVTABLE *table)"
+/*	Receive a sequence of attribute names and string values.
+/*	There can be no more than 1024 attributes in a hash table.
+/* .sp
+/*	The attribute string values are stored in the hash table under
+/*	keys equal to the attribute name (obtained from the input stream).
+/*	Values from the input stream are added to the hash table. Existing
+/*	hash table entries are not replaced.
+/* .sp
+/*	Note: the SEND_ATTR_HASH or SEND_ATTR_NAMEVAL requests
+/*	format their payload as a multi-attr sequence (see syntax
+/*	above). When the receiver's input does not start with a
+/*	multi-attr delimiter (i.e. the sender did not request
+/*	SEND_ATTR_HASH or SEND_ATTR_NAMEVAL), the receiver will
+/*	store all attribute names and values up to the attribute
+/*	list terminator. In terms of code, this means that the
+/*	RECV_ATTR_HASH or RECV_ATTR_NAMEVAL request must be followed
+/*	by ATTR_TYPE_END.
+/* .IP ATTR_TYPE_END
+/*	This argument terminates the requested attribute list.
+/* .RE
+/* BUGS
+/*	RECV_ATTR_HASH (RECV_ATTR_NAMEVAL) accepts attributes with arbitrary
+/*	names from possibly untrusted sources.
+/*	This is unsafe, unless the resulting table is queried only with
+/*	known to be good attribute names.
+/* DIAGNOSTICS
+/*	attr_scan0() and attr_vscan0() return -1 when malformed input is
+/*	detected (string too long, incomplete line, missing end marker).
+/*	Otherwise, the result value is the number of attributes that were
+/*	successfully recovered from the input stream (a hash table counts
+/*	as the number of entries stored into the table).
+/*
+/*	Panic: interface violation. All system call errors are fatal.
+/* SEE ALSO
+/*	attr_print0(3) send attributes over byte stream.
+/* LICENSE
+/* .ad
+/* .fi
+/*	The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/*	Wietse Venema
+/*	IBM T.J. Watson Research
+/*	P.O. Box 704
+/*	Yorktown Heights, NY 10598, USA
+/*
+/*	Wietse Venema
+/*	Google, Inc.
+/*	111 8th Avenue
+/*	New York, NY 10011, USA
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+#include <stdarg.h>
+#include <string.h>
+#include <stdio.h>
+
+/* Utility library. */
+
+#include <msg.h>
+#include <mymalloc.h>
+#include <vstream.h>
+#include <vstring.h>
+#include <vstring_vstream.h>
+#include <htable.h>
+#include <base64_code.h>
+#include <attr.h>
+
+/* Application specific. */
+
+#define STR(x)	vstring_str(x)
+#define LEN(x)	VSTRING_LEN(x)
+
+/* attr_scan0_string - pull a string from the input stream */
+
+static int attr_scan0_string(VSTREAM *fp, VSTRING *plain_buf, const char *context)
+{
+    int     ch;
+
+    if ((ch = vstring_get_null(plain_buf, fp)) == VSTREAM_EOF) {
+	msg_warn("%s on %s while reading %s",
+		 vstream_ftimeout(fp) ? "timeout" : "premature end-of-input",
+		 VSTREAM_PATH(fp), context);
+	return (-1);
+    }
+    if (ch != 0) {
+	msg_warn("unexpected end-of-input from %s while reading %s",
+		 VSTREAM_PATH(fp), context);
+	return (-1);
+    }
+    if (msg_verbose)
+	msg_info("%s: %s", context, *STR(plain_buf) ? STR(plain_buf) : "(end)");
+    return (ch);
+}
+
+/* attr_scan0_data - pull a data blob from the input stream */
+
+static int attr_scan0_data(VSTREAM *fp, VSTRING *str_buf,
+			           const char *context)
+{
+    static VSTRING *base64_buf = 0;
+    int     ch;
+
+    if (base64_buf == 0)
+	base64_buf = vstring_alloc(10);
+    if ((ch = attr_scan0_string(fp, base64_buf, context)) < 0)
+	return (-1);
+    if (base64_decode(str_buf, STR(base64_buf), LEN(base64_buf)) == 0) {
+	msg_warn("malformed base64 data from %s while reading %s: %.100s",
+		 VSTREAM_PATH(fp), context, STR(base64_buf));
+	return (-1);
+    }
+    return (ch);
+}
+
+/* attr_scan0_number - pull a number from the input stream */
+
+static int attr_scan0_number(VSTREAM *fp, unsigned *ptr, VSTRING *str_buf,
+			             const char *context)
+{
+    char    junk = 0;
+    int     ch;
+
+    if ((ch = attr_scan0_string(fp, str_buf, context)) < 0)
+	return (-1);
+    if (sscanf(STR(str_buf), "%u%c", ptr, &junk) != 1 || junk != 0) {
+	msg_warn("malformed numerical data from %s while reading %s: %.100s",
+		 VSTREAM_PATH(fp), context, STR(str_buf));
+	return (-1);
+    }
+    return (ch);
+}
+
+/* attr_scan0_long_number - pull a number from the input stream */
+
+static int attr_scan0_long_number(VSTREAM *fp, unsigned long *ptr,
+				          VSTRING *str_buf,
+				          const char *context)
+{
+    char    junk = 0;
+    int     ch;
+
+    if ((ch = attr_scan0_string(fp, str_buf, context)) < 0)
+	return (-1);
+    if (sscanf(STR(str_buf), "%lu%c", ptr, &junk) != 1 || junk != 0) {
+	msg_warn("malformed numerical data from %s while reading %s: %.100s",
+		 VSTREAM_PATH(fp), context, STR(str_buf));
+	return (-1);
+    }
+    return (ch);
+}
+
+/* attr_vscan0 - receive attribute list from stream */
+
+int     attr_vscan0(VSTREAM *fp, int flags, va_list ap)
+{
+    const char *myname = "attr_scan0";
+    static VSTRING *str_buf = 0;
+    static VSTRING *name_buf = 0;
+    int     wanted_type = -1;
+    char   *wanted_name;
+    unsigned int *number;
+    unsigned long *long_number;
+    VSTRING *string;
+    HTABLE *hash_table;
+    int     ch;
+    int     conversions;
+    ATTR_SCAN_SLAVE_FN scan_fn;
+    void   *scan_arg;
+
+    /*
+     * Sanity check.
+     */
+    if (flags & ~ATTR_FLAG_ALL)
+	msg_panic("%s: bad flags: 0x%x", myname, flags);
+
+    /*
+     * EOF check.
+     */
+    if ((ch = VSTREAM_GETC(fp)) == VSTREAM_EOF)
+	return (0);
+    vstream_ungetc(fp, ch);
+
+    /*
+     * Initialize.
+     */
+    if (str_buf == 0) {
+	str_buf = vstring_alloc(10);
+	name_buf = vstring_alloc(10);
+    }
+
+    /*
+     * Iterate over all (type, name, value) triples.
+     */
+    for (conversions = 0; /* void */ ; conversions++) {
+
+	/*
+	 * Determine the next attribute type and attribute name on the
+	 * caller's wish list.
+	 * 
+	 * If we're reading into a hash table, we already know that the
+	 * attribute value is string-valued, and we get the attribute name
+	 * from the input stream instead. This is secure only when the
+	 * resulting table is queried with known to be good attribute names.
+	 */
+	if (wanted_type != ATTR_TYPE_HASH
+	    && wanted_type != ATTR_TYPE_CLOSE) {
+	    wanted_type = va_arg(ap, int);
+	    if (wanted_type == ATTR_TYPE_END) {
+		if ((flags & ATTR_FLAG_MORE) != 0)
+		    return (conversions);
+		wanted_name = "(list terminator)";
+	    } else if (wanted_type == ATTR_TYPE_HASH) {
+		wanted_name = "(any attribute name or list terminator)";
+		hash_table = va_arg(ap, HTABLE *);
+	    } else if (wanted_type != ATTR_TYPE_FUNC) {
+		wanted_name = va_arg(ap, char *);
+	    }
+	}
+
+	/*
+	 * Locate the next attribute of interest in the input stream.
+	 */
+	while (wanted_type != ATTR_TYPE_FUNC) {
+
+	    /*
+	     * Get the name of the next attribute. Hitting EOF is always bad.
+	     * Hitting the end-of-input early is OK if the caller is prepared
+	     * to deal with missing inputs.
+	     */
+	    if (msg_verbose)
+		msg_info("%s: wanted attribute: %s",
+			 VSTREAM_PATH(fp), wanted_name);
+	    if ((ch = attr_scan0_string(fp, name_buf,
+				    "input attribute name")) == VSTREAM_EOF)
+		return (-1);
+	    if (LEN(name_buf) == 0) {
+		if (wanted_type == ATTR_TYPE_END
+		    || wanted_type == ATTR_TYPE_HASH)
+		    return (conversions);
+		if ((flags & ATTR_FLAG_MISSING) != 0)
+		    msg_warn("missing attribute %s in input from %s",
+			     wanted_name, VSTREAM_PATH(fp));
+		return (conversions);
+	    }
+
+	    /*
+	     * See if the caller asks for this attribute.
+	     */
+	    if (wanted_type == ATTR_TYPE_HASH
+		&& strcmp(ATTR_NAME_OPEN, STR(name_buf)) == 0) {
+		wanted_type = ATTR_TYPE_CLOSE;
+		wanted_name = "(any attribute name or '}')";
+		/* Advance in the input stream. */
+		continue;
+	    } else if (wanted_type == ATTR_TYPE_CLOSE
+		       && strcmp(ATTR_NAME_CLOSE, STR(name_buf)) == 0) {
+		/* Advance in the argument list. */
+		wanted_type = -1;
+		break;
+	    }
+	    if (wanted_type == ATTR_TYPE_HASH
+		|| wanted_type == ATTR_TYPE_CLOSE
+		|| (wanted_type != ATTR_TYPE_END
+		    && strcmp(wanted_name, STR(name_buf)) == 0))
+		break;
+	    if ((flags & ATTR_FLAG_EXTRA) != 0) {
+		msg_warn("unexpected attribute %s from %s (expecting: %s)",
+			 STR(name_buf), VSTREAM_PATH(fp), wanted_name);
+		return (conversions);
+	    }
+
+	    /*
+	     * Skip over this attribute. The caller does not ask for it.
+	     */
+	    (void) attr_scan0_string(fp, str_buf, "input attribute value");
+	}
+
+	/*
+	 * Do the requested conversion.
+	 */
+	switch (wanted_type) {
+	case ATTR_TYPE_INT:
+	    number = va_arg(ap, unsigned int *);
+	    if ((ch = attr_scan0_number(fp, number, str_buf,
+					"input attribute value")) < 0)
+		return (-1);
+	    break;
+	case ATTR_TYPE_LONG:
+	    long_number = va_arg(ap, unsigned long *);
+	    if ((ch = attr_scan0_long_number(fp, long_number, str_buf,
+					     "input attribute value")) < 0)
+		return (-1);
+	    break;
+	case ATTR_TYPE_STR:
+	    string = va_arg(ap, VSTRING *);
+	    if ((ch = attr_scan0_string(fp, string,
+					"input attribute value")) < 0)
+		return (-1);
+	    break;
+	case ATTR_TYPE_DATA:
+	    string = va_arg(ap, VSTRING *);
+	    if ((ch = attr_scan0_data(fp, string,
+				      "input attribute value")) < 0)
+		return (-1);
+	    break;
+	case ATTR_TYPE_FUNC:
+	    scan_fn = va_arg(ap, ATTR_SCAN_SLAVE_FN);
+	    scan_arg = va_arg(ap, void *);
+	    if (scan_fn(attr_scan0, fp, flags | ATTR_FLAG_MORE, scan_arg) < 0)
+		return (-1);
+	    break;
+	case ATTR_TYPE_HASH:
+	case ATTR_TYPE_CLOSE:
+	    if ((ch = attr_scan0_string(fp, str_buf,
+					"input attribute value")) < 0)
+		return (-1);
+	    if (htable_locate(hash_table, STR(name_buf)) != 0) {
+		if ((flags & ATTR_FLAG_EXTRA) != 0) {
+		    msg_warn("duplicate attribute %s in input from %s",
+			     STR(name_buf), VSTREAM_PATH(fp));
+		    return (conversions);
+		}
+	    } else if (hash_table->used >= ATTR_HASH_LIMIT) {
+		msg_warn("attribute count exceeds limit %d in input from %s",
+			 ATTR_HASH_LIMIT, VSTREAM_PATH(fp));
+		return (conversions);
+	    } else {
+		htable_enter(hash_table, STR(name_buf),
+			     mystrdup(STR(str_buf)));
+	    }
+	    break;
+	case -1:
+	    conversions -= 1;
+	    break;
+	default:
+	    msg_panic("%s: unknown type code: %d", myname, wanted_type);
+	}
+    }
+}
+
+/* attr_scan0 - read attribute list from stream */
+
+int     attr_scan0(VSTREAM *fp, int flags,...)
+{
+    va_list ap;
+    int     ret;
+
+    va_start(ap, flags);
+    ret = attr_vscan0(fp, flags, ap);
+    va_end(ap);
+    return (ret);
+}
+
+/* attr_scan_more0 - look ahead for more */
+
+int     attr_scan_more0(VSTREAM *fp)
+{
+    int     ch;
+
+    switch (ch = VSTREAM_GETC(fp)) {
+    case 0:
+	if (msg_verbose)
+	    msg_info("%s: terminator (consumed)", VSTREAM_PATH(fp));
+	return (0);
+    case VSTREAM_EOF:
+	if (msg_verbose)
+	    msg_info("%s: EOF", VSTREAM_PATH(fp));
+	return (-1);
+    default:
+	if (msg_verbose)
+	    msg_info("%s: non-terminator '%c' (lookahead)",
+		     VSTREAM_PATH(fp), ch);
+	(void) vstream_ungetc(fp, ch);
+	return (1);
+    }
+}
+
+#ifdef TEST
+
+ /*
+  * Proof of concept test program.  Mirror image of the attr_scan0 test
+  * program.
+  */
+#include <msg_vstream.h>
+
+int     var_line_limit = 2048;
+
+int     main(int unused_argc, char **used_argv)
+{
+    VSTRING *data_val = vstring_alloc(1);
+    VSTRING *str_val = vstring_alloc(1);
+    HTABLE *table = htable_create(1);
+    HTABLE_INFO **ht_info_list;
+    HTABLE_INFO **ht;
+    int     int_val;
+    long    long_val;
+    long    long_val2;
+    int     ret;
+
+    msg_verbose = 1;
+    msg_vstream_init(used_argv[0], VSTREAM_ERR);
+    if ((ret = attr_scan0(VSTREAM_IN,
+			  ATTR_FLAG_STRICT,
+			  RECV_ATTR_INT(ATTR_NAME_INT, &int_val),
+			  RECV_ATTR_LONG(ATTR_NAME_LONG, &long_val),
+			  RECV_ATTR_STR(ATTR_NAME_STR, str_val),
+			  RECV_ATTR_DATA(ATTR_NAME_DATA, data_val),
+			  RECV_ATTR_HASH(table),
+			  RECV_ATTR_LONG(ATTR_NAME_LONG, &long_val2),
+			  ATTR_TYPE_END)) > 4) {
+	vstream_printf("%s %d\n", ATTR_NAME_INT, int_val);
+	vstream_printf("%s %ld\n", ATTR_NAME_LONG, long_val);
+	vstream_printf("%s %s\n", ATTR_NAME_STR, STR(str_val));
+	vstream_printf("%s %s\n", ATTR_NAME_DATA, STR(str_val));
+	ht_info_list = htable_list(table);
+	for (ht = ht_info_list; *ht; ht++)
+	    vstream_printf("(hash) %s %s\n", ht[0]->key, (char *) ht[0]->value);
+	myfree((void *) ht_info_list);
+	vstream_printf("%s %ld\n", ATTR_NAME_LONG, long_val2);
+    } else {
+	vstream_printf("return: %d\n", ret);
+    }
+    if ((ret = attr_scan0(VSTREAM_IN,
+			  ATTR_FLAG_STRICT,
+			  RECV_ATTR_INT(ATTR_NAME_INT, &int_val),
+			  RECV_ATTR_LONG(ATTR_NAME_LONG, &long_val),
+			  RECV_ATTR_STR(ATTR_NAME_STR, str_val),
+			  RECV_ATTR_DATA(ATTR_NAME_DATA, data_val),
+			  ATTR_TYPE_END)) == 4) {
+	vstream_printf("%s %d\n", ATTR_NAME_INT, int_val);
+	vstream_printf("%s %ld\n", ATTR_NAME_LONG, long_val);
+	vstream_printf("%s %s\n", ATTR_NAME_STR, STR(str_val));
+	vstream_printf("%s %s\n", ATTR_NAME_DATA, STR(data_val));
+	ht_info_list = htable_list(table);
+	for (ht = ht_info_list; *ht; ht++)
+	    vstream_printf("(hash) %s %s\n", ht[0]->key, (char *) ht[0]->value);
+	myfree((void *) ht_info_list);
+    } else {
+	vstream_printf("return: %d\n", ret);
+    }
+    if (vstream_fflush(VSTREAM_OUT) != 0)
+	msg_fatal("write error: %m");
+
+    vstring_free(data_val);
+    vstring_free(str_val);
+    htable_free(table, myfree);
+
+    return (0);
+}
+
+#endif