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/*++
/* NAME
/* showq_json 8
/* SUMMARY
/* JSON queue status formatter
/* SYNOPSIS
/* void showq_json(
/* VSTREAM *showq)
/* DESCRIPTION
/* This function converts showq(8) daemon output to JSON format.
/* DIAGNOSTICS
/* Fatal errors: out of memory, malformed showq(8) daemon output.
/* 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 <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sysexits.h>
#include <ctype.h>
#include <errno.h>
/* Utility library. */
#include <vstring.h>
#include <vstream.h>
#include <stringops.h>
#include <mymalloc.h>
#include <msg.h>
/* Global library. */
#include <mail_proto.h>
#include <mail_queue.h>
#include <mail_date.h>
#include <mail_params.h>
/* Application-specific. */
#include <postqueue.h>
#define STR(x) vstring_str(x)
#define LEN(x) VSTRING_LEN(x)
/* json_quote - quote JSON string */
static char *json_quote(VSTRING *result, const char *text)
{
unsigned char *cp;
int ch;
/*
* We use short escape sequences for common control characters. Note that
* RFC 4627 allows "/" (0x2F) to be sent without quoting. Differences
* with RFC 4627: we send DEL (0x7f) as \u007F; the result remains RFC
* 4627 complaint.
*/
VSTRING_RESET(result);
for (cp = (unsigned char *) text; (ch = *cp) != 0; cp++) {
if (UNEXPECTED(ISCNTRL(ch))) {
switch (ch) {
case '\b':
VSTRING_ADDCH(result, '\\');
VSTRING_ADDCH(result, 'b');
break;
case '\f':
VSTRING_ADDCH(result, '\\');
VSTRING_ADDCH(result, 'f');
break;
case '\n':
VSTRING_ADDCH(result, '\\');
VSTRING_ADDCH(result, 'n');
break;
case '\r':
VSTRING_ADDCH(result, '\\');
VSTRING_ADDCH(result, 'r');
break;
case '\t':
VSTRING_ADDCH(result, '\\');
VSTRING_ADDCH(result, 't');
break;
default:
vstring_sprintf_append(result, "\\u%04X", ch);
break;
}
} else {
switch (ch) {
case '\\':
case '"':
VSTRING_ADDCH(result, '\\');
/* FALLTHROUGH */
default:
VSTRING_ADDCH(result, ch);
break;
}
}
}
VSTRING_TERMINATE(result);
/*
* Force the result to be UTF-8 (with SMTPUTF8 enabled) or ASCII (with
* SMTPUTF8 disabled).
*/
printable(STR(result), '?');
return (STR(result));
}
/* json_message - report status for one message */
static void format_json(VSTREAM *showq_stream)
{
static VSTRING *queue_name = 0;
static VSTRING *queue_id = 0;
static VSTRING *addr = 0;
static VSTRING *why = 0;
static VSTRING *quote_buf = 0;
long arrival_time;
long message_size;
int showq_status;
int rcpt_count = 0;
int forced_expire;
/*
* One-time initialization.
*/
if (queue_name == 0) {
queue_name = vstring_alloc(100);
queue_id = vstring_alloc(100);
addr = vstring_alloc(100);
why = vstring_alloc(100);
quote_buf = vstring_alloc(100);
}
/*
* Read the message properties and sender address.
*/
if (attr_scan(showq_stream, ATTR_FLAG_MORE | ATTR_FLAG_STRICT,
RECV_ATTR_STR(MAIL_ATTR_QUEUE, queue_name),
RECV_ATTR_STR(MAIL_ATTR_QUEUEID, queue_id),
RECV_ATTR_LONG(MAIL_ATTR_TIME, &arrival_time),
RECV_ATTR_LONG(MAIL_ATTR_SIZE, &message_size),
RECV_ATTR_INT(MAIL_ATTR_FORCED_EXPIRE, &forced_expire),
RECV_ATTR_STR(MAIL_ATTR_SENDER, addr),
ATTR_TYPE_END) != 6)
msg_fatal_status(EX_SOFTWARE, "malformed showq server response");
vstream_printf("{");
vstream_printf("\"queue_name\": \"%s\", ",
json_quote(quote_buf, STR(queue_name)));
vstream_printf("\"queue_id\": \"%s\", ",
json_quote(quote_buf, STR(queue_id)));
vstream_printf("\"arrival_time\": %ld, ", arrival_time);
vstream_printf("\"message_size\": %ld, ", message_size);
vstream_printf("\"forced_expire\": %s, ", forced_expire ? "true" : "false");
vstream_printf("\"sender\": \"%s\", ",
json_quote(quote_buf, STR(addr)));
/*
* Read zero or more (recipient, reason) pair(s) until attr_scan_more()
* consumes a terminator. If the showq daemon messes up, don't try to
* resynchronize.
*/
vstream_printf("\"recipients\": [");
for (rcpt_count = 0; (showq_status = attr_scan_more(showq_stream)) > 0; rcpt_count++) {
if (rcpt_count > 0)
vstream_printf(", ");
vstream_printf("{");
if (attr_scan(showq_stream, ATTR_FLAG_MORE | ATTR_FLAG_STRICT,
RECV_ATTR_STR(MAIL_ATTR_RECIP, addr),
RECV_ATTR_STR(MAIL_ATTR_WHY, why),
ATTR_TYPE_END) != 2)
msg_fatal_status(EX_SOFTWARE, "malformed showq server response");
vstream_printf("\"address\": \"%s\"",
json_quote(quote_buf, STR(addr)));
if (LEN(why) > 0)
vstream_printf(", \"delay_reason\": \"%s\"",
json_quote(quote_buf, STR(why)));
vstream_printf("}");
}
vstream_printf("]");
if (showq_status < 0)
msg_fatal_status(EX_SOFTWARE, "malformed showq server response");
vstream_printf("}\n");
if (vstream_fflush(VSTREAM_OUT) && errno != EPIPE)
msg_fatal_status(EX_IOERR, "output write error: %m");
}
/* showq_json - streaming JSON-format output adapter */
void showq_json(VSTREAM *showq_stream)
{
int showq_status;
/*
* Emit zero or more queue file objects until attr_scan_more() consumes a
* terminator.
*/
while ((showq_status = attr_scan_more(showq_stream)) > 0
&& vstream_ferror(VSTREAM_OUT) == 0) {
format_json(showq_stream);
}
if (showq_status < 0)
msg_fatal_status(EX_SOFTWARE, "malformed showq server response");
}
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