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-rw-r--r--src/global/dsn_util.c183
1 files changed, 183 insertions, 0 deletions
diff --git a/src/global/dsn_util.c b/src/global/dsn_util.c
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+/*++
+/* NAME
+/* dsn_util 3
+/* SUMMARY
+/* DSN status parsing routines
+/* SYNOPSIS
+/* #include <dsn_util.h>
+/*
+/* #define DSN_SIZE ...
+/*
+/* typedef struct { ... } DSN_BUF;
+/*
+/* typedef struct {
+/* .in +4
+/* DSN_STAT dsn; /* RFC 3463 status */
+/* const char *text; /* Free text */
+/* .in -4
+/* } DSN_SPLIT;
+/*
+/* DSN_SPLIT *dsn_split(dp, def_dsn, text)
+/* DSN_SPLIT *dp;
+/* const char *def_dsn;
+/* const char *text;
+/*
+/* char *dsn_prepend(def_dsn, text)
+/* const char *def_dsn;
+/* const char *text;
+/*
+/* size_t dsn_valid(text)
+/* const char *text;
+/*
+/* void DSN_UPDATE(dsn_buf, dsn, len)
+/* DSN_BUF dsn_buf;
+/* const char *dsn;
+/* size_t len;
+/*
+/* const char *DSN_CODE(dsn_buf)
+/* DSN_BUF dsn_buf;
+/*
+/* char *DSN_CLASS(dsn_buf)
+/* DSN_BUF dsn_buf;
+/* DESCRIPTION
+/* The functions in this module manipulate pairs of RFC 3463
+/* status codes and descriptive free text.
+/*
+/* dsn_split() splits text into an RFC 3463 status code and
+/* descriptive free text. When the text does not start with
+/* a status code, the specified default status code is used
+/* instead. Whitespace before the optional status code or
+/* text is skipped. dsn_split() returns a copy of the RFC
+/* 3463 status code, and returns a pointer to (not copy of)
+/* the remainder of the text. The result value is the first
+/* argument.
+/*
+/* dsn_prepend() prepends the specified default RFC 3463 status
+/* code to the specified text if no status code is present in
+/* the text. This function produces the same result as calling
+/* concatenate() with the results from dsn_split(). The result
+/* should be passed to myfree(). Whitespace before the optional
+/* status code or text is skipped.
+/*
+/* dsn_valid() returns the length of the RFC 3463 status code
+/* at the beginning of text, or zero. It does not skip initial
+/* whitespace.
+/*
+/* Arguments:
+/* .IP def_dsn
+/* Null-terminated default RFC 3463 status code that will be
+/* used when the free text does not start with one.
+/* .IP dp
+/* Pointer to storage for copy of DSN status code, and for
+/* pointer to free text.
+/* .IP dsn
+/* Null-terminated RFC 3463 status code.
+/* .IP text
+/* Null-terminated free text.
+/* SEE ALSO
+/* msg(3) diagnostics interface
+/* DIAGNOSTICS
+/* Panic: invalid default DSN code.
+/* 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 <stdarg.h>
+#include <string.h>
+#include <ctype.h>
+
+/* Utility library. */
+
+#include <msg.h>
+#include <mymalloc.h>
+#include <vstring.h>
+#include <stringops.h>
+
+/* Global library. */
+
+#include <dsn_util.h>
+
+/* dsn_valid - check RFC 3463 enhanced status code, return length or zero */
+
+size_t dsn_valid(const char *text)
+{
+ const unsigned char *cp = (unsigned char *) text;
+ size_t len;
+
+ /* First portion is one digit followed by dot. */
+ if ((cp[0] != '2' && cp[0] != '4' && cp[0] != '5') || cp[1] != '.')
+ return (0);
+
+ /* Second portion is 1-3 digits followed by dot. */
+ cp += 2;
+ if ((len = strspn((char *) cp, "0123456789")) < 1 || len > DSN_DIGS2
+ || cp[len] != '.')
+ return (0);
+
+ /* Last portion is 1-3 digits followed by end-of-string or whitespace. */
+ cp += len + 1;
+ if ((len = strspn((char *) cp, "0123456789")) < 1 || len > DSN_DIGS3
+ || (cp[len] != 0 && !ISSPACE(cp[len])))
+ return (0);
+
+ return (((char *) cp - text) + len);
+}
+
+/* dsn_split - split text into DSN and text */
+
+DSN_SPLIT *dsn_split(DSN_SPLIT *dp, const char *def_dsn, const char *text)
+{
+ const char *myname = "dsn_split";
+ const char *cp = text;
+ size_t len;
+
+ /*
+ * Look for an optional RFC 3463 enhanced status code.
+ *
+ * XXX If we want to enforce that the first digit of the status code in the
+ * text matches the default status code, then pipe_command() needs to be
+ * changed. It currently auto-detects the reply code without knowing in
+ * advance if the result will start with '4' or '5'.
+ */
+ while (ISSPACE(*cp))
+ cp++;
+ if ((len = dsn_valid(cp)) > 0) {
+ strncpy(dp->dsn.data, cp, len);
+ dp->dsn.data[len] = 0;
+ cp += len + 1;
+ } else if ((len = dsn_valid(def_dsn)) > 0) {
+ strncpy(dp->dsn.data, def_dsn, len);
+ dp->dsn.data[len] = 0;
+ } else {
+ msg_panic("%s: bad default status \"%s\"", myname, def_dsn);
+ }
+
+ /*
+ * The remainder is free text.
+ */
+ while (ISSPACE(*cp))
+ cp++;
+ dp->text = cp;
+
+ return (dp);
+}
+
+/* dsn_prepend - prepend optional status to text, result on heap */
+
+char *dsn_prepend(const char *def_dsn, const char *text)
+{
+ DSN_SPLIT dp;
+
+ dsn_split(&dp, def_dsn, text);
+ return (concatenate(DSN_STATUS(dp.dsn), " ", dp.text, (char *) 0));
+}