Adding upstream version 3.4.23.upstream/3.4.23upstream

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

1 files changed, 266 insertions, 0 deletions

diff --git a/src/global/header_token.c b/src/global/header_token.c
new file mode 100644
index 0000000..3375125
--- /dev/null
+++ b/src/global/header_token.c
@@ -0,0 +1,266 @@
+/*++
+/* NAME
+/*	header_token 3
+/* SUMMARY
+/*	mail header parser
+/* SYNOPSIS
+/*	#include <header_token.h>
+/*
+/*	typedef struct {
+/* .in +4
+/*	    int     type;
+/*	    const char *u.value;
+/*	    /* ... */
+/* .in
+/*	} HEADER_TOKEN;
+/*
+/*	ssize_t	header_token(token, token_len, token_buffer, ptr,
+/*				specials, terminator)
+/*	HEADER_TOKEN *token;
+/*	ssize_t	token_len;
+/*	VSTRING *token_buffer;
+/*	const char **ptr;
+/*	const char *specials;
+/*	int	terminator;
+/* DESCRIPTION
+/*	This module parses a mail header value (text after field-name:)
+/*	into tokens. The parser understands RFC 822 linear white space,
+/*	quoted-string, comment, control characters, and a set of
+/*	user-specified special characters.
+/*
+/*	A result token type is one of the following:
+/* .IP HEADER_TOK_QSTRING
+/*	Quoted string as per RFC 822.
+/* .IP HEADER_TOK_TOKEN
+/*	Token as per RFC 822, and the special characters supplied by the
+/*	caller.
+/* .IP other
+/*	The value of a control character or special character.
+/* .PP
+/*	header_token() tokenizes the input and stops after a user-specified
+/*	terminator (ignoring all tokens that exceed the capacity of
+/*	the result storage), or when it runs out of space for the result.
+/*	The terminator is not stored. The result value is the number of
+/*	tokens stored, or -1 when the input was exhausted before any tokens
+/*	were found.
+/*
+/*	Arguments:
+/* .IP token
+/*	Result array of HEADER_TOKEN structures. Token string values
+/*	are pointers to null-terminated substrings in the token_buffer.
+/* .IP token_len
+/*	Length of the array of HEADER_TOKEN structures.
+/* .IP token_buffer
+/*	Storage for result token string values.
+/* .IP ptr
+/*	Input/output read position. The input is a null-terminated string.
+/* .IP specials
+/*	Special characters according to the relevant RFC, or a
+/*	null pointer (default to the RFC 822 special characters).
+/*	This must include the optional terminator if one is specified.
+/* .IP terminator
+/*	The special character to stop after, or zero.
+/* BUGS
+/*	Eight-bit characters are not given special treatment.
+/* SEE ALSO
+/*	RFC 822 (ARPA Internet Text Messages)
+/* DIAGNOSTICS
+/*	Fatal errors: memory allocation problem.
+/* 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
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+#include <string.h>
+#include <ctype.h>
+
+/* Utility library. */
+
+#include <msg.h>
+#include <vstring.h>
+
+/* Global library. */
+
+#include <lex_822.h>
+#include <header_token.h>
+
+/* Application-specific. */
+
+ /*
+  * Silly little macros.
+  */
+#define STR(x)	vstring_str(x)
+#define LEN(x)	VSTRING_LEN(x)
+#define CU_CHAR_PTR(x)	((const unsigned char *) (x))
+
+/* header_token - parse out the next item in a message header */
+
+ssize_t header_token(HEADER_TOKEN *token, ssize_t token_len,
+		             VSTRING *token_buffer, const char **ptr,
+		             const char *user_specials, int user_terminator)
+{
+    ssize_t comment_level;
+    const unsigned char *cp;
+    ssize_t len;
+    int     ch;
+    ssize_t tok_count;
+    ssize_t n;
+
+    /*
+     * Initialize.
+     */
+    VSTRING_RESET(token_buffer);
+    cp = CU_CHAR_PTR(*ptr);
+    tok_count = 0;
+    if (user_specials == 0)
+	user_specials = LEX_822_SPECIALS;
+
+    /*
+     * Main parsing loop.
+     * 
+     * XXX What was the reason to continue parsing when user_terminator is
+     * specified? Perhaps this was needed at some intermediate stage of
+     * development?
+     */
+    while ((ch = *cp) != 0 && (user_terminator != 0 || tok_count < token_len)) {
+	cp++;
+
+	/*
+	 * Skip RFC 822 linear white space.
+	 */
+	if (IS_SPACE_TAB_CR_LF(ch))
+	    continue;
+
+	/*
+	 * Terminator.
+	 */
+	if (ch == user_terminator)
+	    break;
+
+	/*
+	 * Skip RFC 822 comment.
+	 */
+	if (ch == '(') {
+	    comment_level = 1;
+	    while ((ch = *cp) != 0) {
+		cp++;
+		if (ch == '(') {		/* comments can nest! */
+		    comment_level++;
+		} else if (ch == ')') {
+		    if (--comment_level == 0)
+			break;
+		} else if (ch == '\\') {
+		    if ((ch = *cp) == 0)
+			break;
+		    cp++;
+		}
+	    }
+	    continue;
+	}
+
+	/*
+	 * Copy quoted text according to RFC 822.
+	 */
+	if (ch == '"') {
+	    if (tok_count < token_len) {
+		token[tok_count].u.offset = LEN(token_buffer);
+		token[tok_count].type = HEADER_TOK_QSTRING;
+	    }
+	    while ((ch = *cp) != 0) {
+		cp++;
+		if (ch == '"')
+		    break;
+		if (ch == '\n') {		/* unfold */
+		    if (tok_count < token_len) {
+			len = LEN(token_buffer);
+			while (len > 0
+			  && IS_SPACE_TAB_CR_LF(STR(token_buffer)[len - 1]))
+			    len--;
+			if (len < LEN(token_buffer))
+			    vstring_truncate(token_buffer, len);
+		    }
+		    continue;
+		}
+		if (ch == '\\') {
+		    if ((ch = *cp) == 0)
+			break;
+		    cp++;
+		}
+		if (tok_count < token_len)
+		    VSTRING_ADDCH(token_buffer, ch);
+	    }
+	    if (tok_count < token_len) {
+		VSTRING_ADDCH(token_buffer, 0);
+		tok_count++;
+	    }
+	    continue;
+	}
+
+	/*
+	 * Control, or special.
+	 */
+	if (strchr(user_specials, ch) || ISCNTRL(ch)) {
+	    if (tok_count < token_len) {
+		token[tok_count].u.offset = LEN(token_buffer);
+		token[tok_count].type = ch;
+		VSTRING_ADDCH(token_buffer, ch);
+		VSTRING_ADDCH(token_buffer, 0);
+		tok_count++;
+	    }
+	    continue;
+	}
+
+	/*
+	 * Token.
+	 */
+	else {
+	    if (tok_count < token_len) {
+		token[tok_count].u.offset = LEN(token_buffer);
+		token[tok_count].type = HEADER_TOK_TOKEN;
+		VSTRING_ADDCH(token_buffer, ch);
+	    }
+	    while ((ch = *cp) != 0 && !IS_SPACE_TAB_CR_LF(ch)
+		   && !ISCNTRL(ch) && !strchr(user_specials, ch)) {
+		cp++;
+		if (tok_count < token_len)
+		    VSTRING_ADDCH(token_buffer, ch);
+	    }
+	    if (tok_count < token_len) {
+		VSTRING_ADDCH(token_buffer, 0);
+		tok_count++;
+	    }
+	    continue;
+	}
+    }
+
+    /*
+     * Ignore a zero-length item after the last terminator.
+     */
+    if (tok_count == 0 && ch == 0)
+	return (-1);
+
+    /*
+     * Finalize. Fill in the string pointer array, now that the token buffer
+     * is no longer dynamically reallocated as it grows.
+     */
+    *ptr = (const char *) cp;
+    for (n = 0; n < tok_count; n++)
+	token[n].u.value = STR(token_buffer) + token[n].u.offset;
+
+    if (msg_verbose)
+	msg_info("header_token: %s %s %s",
+		 tok_count > 0 ? token[0].u.value : "",
+		 tok_count > 1 ? token[1].u.value : "",
+		 tok_count > 2 ? token[2].u.value : "");
+
+    return (tok_count);
+}