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-rw-r--r--src/global/dsn_buf.c342
1 files changed, 342 insertions, 0 deletions
diff --git a/src/global/dsn_buf.c b/src/global/dsn_buf.c
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+/*++
+/* NAME
+/* dsn_buf 3
+/* SUMMARY
+/* delivery status buffer
+/* SYNOPSIS
+/* #include <dsn_buf.h>
+/*
+/* typedef struct {
+/* .in +4
+/* /* Convenience member */
+/* DSN dsn; /* light-weight, dsn(3) */
+/* /* Formal members... */
+/* VSTRING *status; /* RFC 3463 */
+/* VSTRING *action; /* RFC 3464 */
+/* VSTRING *mtype; /* dns */
+/* VSTRING *mname; /* host or domain */
+/* VSTRING *dtype; /* smtp, x-unix */
+/* VSTRING *dtext; /* RFC 2821, sysexits.h */
+/* /* Informal members... */
+/* VSTRING *reason; /* informal text */
+/* .in -4
+/* } DSN_BUF;
+/*
+/* DSN_BUF *dsb_create(void)
+/*
+/* DSN_BUF *dsb_update(dsb, status, action, mtype, mname, dtype,
+/* dtext, reason_fmt, ...)
+/* DSN_BUF *dsb;
+/* const char *status;
+/* const char *action;
+/* const char *mtype;
+/* const char *mname;
+/* const char *dtype;
+/* const char *dtext;
+/* const char *reason_fmt;
+/*
+/* DSN_BUF *dsb_simple(dsb, status, reason_fmt, ...)
+/* DSN_BUF *dsb;
+/* const char *status;
+/* const char *reason_fmt;
+/*
+/* DSN_BUF *dsb_unix(dsb, status, dtext, reason_fmt, ...)
+/* DSN_BUF *dsb;
+/* const char *status;
+/* const char *reason_fmt;
+/*
+/* DSN_BUF *dsb_formal(dsb, status, action, mtype, mname, dtype,
+/* dtext)
+/* DSN_BUF *dsb;
+/* const char *status;
+/* const char *action;
+/* const char *mtype;
+/* const char *mname;
+/* const char *dtype;
+/* const char *dtext;
+/*
+/* DSN_BUF *dsb_status(dsb, status)
+/* DSN_BUF *dsb;
+/* const char *status;
+/*
+/* void dsb_reset(dsb)
+/* DSN_BUF *dsb;
+/*
+/* void dsb_free(dsb)
+/* DSN_BUF *dsb;
+/*
+/* DSN *DSN_FROM_DSN_BUF(dsb)
+/* DSN_BUF *dsb;
+/* DESCRIPTION
+/* This module implements a simple to update delivery status
+/* buffer for Postfix-internal use. Typically it is filled in
+/* the course of delivery attempt, and then formatted into a
+/* DSN structure for external notification.
+/*
+/* dsb_create() creates initialized storage for formal RFC 3464
+/* attributes, and human-readable informal text.
+/*
+/* dsb_update() updates all fields.
+/*
+/* dsb_simple() updates the status and informal text, and resets all
+/* other fields to defaults.
+/*
+/* dsb_unix() updates the status, diagnostic code, diagnostic
+/* text, and informal text, sets the diagnostic type to UNIX,
+/* and resets all other fields to defaults.
+/*
+/* dsb_formal() updates all fields except the informal text.
+/*
+/* dsb_status() updates the status field, and resets all
+/* formal fields to defaults.
+/*
+/* dsb_reset() resets all fields in a DSN_BUF structure without
+/* deallocating memory.
+/*
+/* dsb_free() recycles the storage that was allocated by
+/* dsb_create(), and so on.
+/*
+/* DSN_FROM_DSN_BUF() populates the DSN member with a shallow
+/* copy of the contents of the formal and informal fields, and
+/* returns a pointer to the DSN member. This is typically used
+/* for external reporting.
+/*
+/* Arguments:
+/* .IP dsb
+/* Delivery status buffer.
+/* .IP status
+/* RFC 3463 "enhanced" status code.
+/* .IP action
+/* RFC 3464 action code; specify DSB_DEF_ACTION to derive the
+/* action from the status value. The only values that really
+/* matter here are "expanded" and "relayed"; all other values
+/* are already implied by the context.
+/* .IP mtype
+/* The remote MTA type.
+/* The only valid type is DSB_MTYPE_DNS. The macro DSB_SKIP_RMTA
+/* conveniently expands into a null argument list for the
+/* remote MTA type and name.
+/* .IP mname
+/* Remote MTA name.
+/* .IP dtype
+/* The reply type.
+/* DSB_DTYPE_SMTP or DSB_DTYPE_UNIX. The macro DSB_SKIP_REPLY
+/* conveniently expands into a null argument list for the reply
+/* type and text.
+/* .IP dtext
+/* The reply text. The reply text is reset when dtype is
+/* DSB_SKIP_REPLY.
+/* .IP reason_fmt
+/* The informal reason format.
+/* SEE ALSO
+/* msg(3) diagnostics interface
+/* DIAGNOSTICS
+/* Fatal: out of memory.
+/* 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 <stdlib.h> /* 44BSD stdarg.h uses abort() */
+#include <stdarg.h>
+#include <string.h>
+
+/* Utility library. */
+
+#include <msg.h>
+#include <mymalloc.h>
+#include <vstring.h>
+
+/* Global library. */
+
+#include <dsn_buf.h>
+
+/* Application-specific. */
+
+#define STR(x) vstring_str(x)
+
+/* dsb_create - create delivery status buffer */
+
+DSN_BUF *dsb_create(void)
+{
+ DSN_BUF *dsb;
+
+ /*
+ * Some fields aren't needed until we want to report an error.
+ */
+ dsb = (DSN_BUF *) mymalloc(sizeof(*dsb));
+ dsb->status = vstring_alloc(10);
+ dsb->action = vstring_alloc(10);
+ dsb->mtype = vstring_alloc(10);
+ dsb->mname = vstring_alloc(100);
+ dsb->dtype = vstring_alloc(10);
+ dsb->dtext = vstring_alloc(100);
+ dsb->reason = vstring_alloc(100);
+
+ return (dsb);
+}
+
+/* dsb_free - destroy storage */
+
+void dsb_free(DSN_BUF *dsb)
+{
+ vstring_free(dsb->status);
+ vstring_free(dsb->action);
+ vstring_free(dsb->mtype);
+ vstring_free(dsb->mname);
+ vstring_free(dsb->dtype);
+ vstring_free(dsb->dtext);
+ vstring_free(dsb->reason);
+ myfree((void *) dsb);
+}
+
+ /*
+ * Initial versions of this code represented unavailable inputs with null
+ * pointers, which produced fragile and hard to maintain code. The current
+ * code uses empty strings instead of null pointers.
+ *
+ * For safety we keep the test for null pointers in input. It's cheap.
+ */
+#define DSB_TRUNCATE(s) \
+ do { VSTRING_RESET(s); VSTRING_TERMINATE(s); } while (0)
+
+#define NULL_OR_EMPTY(s) ((s) == 0 || *(s) == 0)
+
+#define DSB_ACTION(dsb, stat, act) \
+ vstring_strcpy((dsb)->action, !NULL_OR_EMPTY(act) ? (act) : "")
+
+#define DSB_MTA(dsb, type, name) do { \
+ if (NULL_OR_EMPTY(type) || NULL_OR_EMPTY(name)) { \
+ DSB_TRUNCATE((dsb)->mtype); \
+ DSB_TRUNCATE((dsb)->mname); \
+ } else { \
+ vstring_strcpy((dsb)->mtype, (type)); \
+ vstring_strcpy((dsb)->mname, (name)); \
+ } \
+} while (0)
+
+#define DSB_DIAG(dsb, type, text) do { \
+ if (NULL_OR_EMPTY(type) || NULL_OR_EMPTY(text)) { \
+ DSB_TRUNCATE((dsb)->dtype); \
+ DSB_TRUNCATE((dsb)->dtext); \
+ } else { \
+ vstring_strcpy((dsb)->dtype, (type)); \
+ vstring_strcpy((dsb)->dtext, (text)); \
+ } \
+} while (0)
+
+/* dsb_update - update formal attributes and informal text */
+
+DSN_BUF *dsb_update(DSN_BUF *dsb, const char *status, const char *action,
+ const char *mtype, const char *mname,
+ const char *dtype, const char *dtext,
+ const char *format,...)
+{
+ va_list ap;
+
+ vstring_strcpy(dsb->status, status);
+ DSB_ACTION(dsb, status, action);
+ DSB_MTA(dsb, mtype, mname);
+ DSB_DIAG(dsb, dtype, dtext);
+ va_start(ap, format);
+ vstring_vsprintf(dsb->reason, format, ap);
+ va_end(ap);
+
+ return (dsb);
+}
+
+/* vdsb_simple - update status and informal text, va_list form */
+
+DSN_BUF *vdsb_simple(DSN_BUF *dsb, const char *status, const char *format,
+ va_list ap)
+{
+ vstring_strcpy(dsb->status, status);
+ DSB_TRUNCATE(dsb->action);
+ DSB_TRUNCATE(dsb->mtype);
+ DSB_TRUNCATE(dsb->mname);
+ DSB_TRUNCATE(dsb->dtype);
+ DSB_TRUNCATE(dsb->dtext);
+ vstring_vsprintf(dsb->reason, format, ap);
+
+ return (dsb);
+}
+
+/* dsb_simple - update status and informal text */
+
+DSN_BUF *dsb_simple(DSN_BUF *dsb, const char *status, const char *format,...)
+{
+ va_list ap;
+
+ va_start(ap, format);
+ (void) vdsb_simple(dsb, status, format, ap);
+ va_end(ap);
+ return (dsb);
+}
+
+/* dsb_unix - update status, UNIX diagnostic and informal text */
+
+DSN_BUF *dsb_unix(DSN_BUF *dsb, const char *status,
+ const char *dtext, const char *format,...)
+{
+ va_list ap;
+
+ vstring_strcpy(dsb->status, status);
+ DSB_TRUNCATE(dsb->action);
+ DSB_TRUNCATE(dsb->mtype);
+ DSB_TRUNCATE(dsb->mname);
+ vstring_strcpy(dsb->dtype, DSB_DTYPE_UNIX);
+ vstring_strcpy(dsb->dtext, dtext);
+ va_start(ap, format);
+ vstring_vsprintf(dsb->reason, format, ap);
+ va_end(ap);
+
+ return (dsb);
+}
+
+/* dsb_formal - update the formal fields */
+
+DSN_BUF *dsb_formal(DSN_BUF *dsb, const char *status, const char *action,
+ const char *mtype, const char *mname,
+ const char *dtype, const char *dtext)
+{
+ vstring_strcpy(dsb->status, status);
+ DSB_ACTION(dsb, status, action);
+ DSB_MTA(dsb, mtype, mname);
+ DSB_DIAG(dsb, dtype, dtext);
+ return (dsb);
+}
+
+/* dsb_status - update the status, reset other formal fields */
+
+DSN_BUF *dsb_status(DSN_BUF *dsb, const char *status)
+{
+ vstring_strcpy(dsb->status, status);
+ DSB_TRUNCATE(dsb->action);
+ DSB_TRUNCATE(dsb->mtype);
+ DSB_TRUNCATE(dsb->mname);
+ DSB_TRUNCATE(dsb->dtype);
+ DSB_TRUNCATE(dsb->dtext);
+ return (dsb);
+}
+
+/* dsb_reset - reset all fields */
+
+void dsb_reset(DSN_BUF *dsb)
+{
+ DSB_TRUNCATE(dsb->status);
+ DSB_TRUNCATE(dsb->action);
+ DSB_TRUNCATE(dsb->mtype);
+ DSB_TRUNCATE(dsb->mname);
+ DSB_TRUNCATE(dsb->dtype);
+ DSB_TRUNCATE(dsb->dtext);
+ DSB_TRUNCATE(dsb->reason);
+}
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