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-rw-r--r--src/messages.c493
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diff --git a/src/messages.c b/src/messages.c
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-/* $Id: messages.c 5496 2002-06-07 13:59:06Z alexk $
-**
-** Message and error reporting (possibly fatal).
-**
-** Usage:
-**
-** extern int cleanup(void);
-** extern void log(int, const char *, va_list, int);
-**
-** message_fatal_cleanup = cleanup;
-** message_program_name = argv[0];
-**
-** warn("Something horrible happened at %lu", time);
-** syswarn("Couldn't unlink temporary file %s", tmpfile);
-**
-** die("Something fatal happened at %lu", time);
-** sysdie("open of %s failed", filename);
-**
-** debug("Some debugging message about %s", string);
-** trace(TRACE_PROGRAM, "Program trace output");
-** notice("Informational notices");
-**
-** message_handlers_warn(1, log);
-** warn("This now goes through our log function");
-**
-** These functions implement message reporting through user-configurable
-** handler functions. debug() only does something if DEBUG is defined,
-** trace() supports sending trace messages in one of a number of configurable
-** classes of traces so that they can be turned on or off independently, and
-** notice() and warn() just output messages as configured. die() similarly
-** outputs a message but then exits, normally with a status of 1.
-**
-** The sys* versions do the same, but append a colon, a space, and the
-** results of strerror(errno) to the end of the message. All functions
-** accept printf-style formatting strings and arguments.
-**
-** If message_fatal_cleanup is non-NULL, it is called before exit by die and
-** sysdie and its return value is used as the argument to exit. It is a
-** pointer to a function taking no arguments and returning an int, and can be
-** used to call cleanup functions or to exit in some alternate fashion (such
-** as by calling _exit).
-**
-** If message_program_name is non-NULL, the string it points to, followed by
-** a colon and a space, is prepended to all error messages logged through the
-** message_log_stdout and message_log_stderr message handlers (the former is
-** the default for notice, and the latter is the default for warn and die).
-**
-** Honoring error_program_name and printing to stderr is just the default
-** handler; with message_handlers_* the handlers for any message function can
-** be changed. By default, notice prints to stdout, warn and die print to
-** stderr, and the others don't do anything at all. These functions take a
-** count of handlers and then that many function pointers, each one to a
-** function that takes a message length (the number of characters snprintf
-** generates given the format and arguments), a format, an argument list as a
-** va_list, and the applicable errno value (if any).
-*/
-
-/* Used for unused parameters to silence gcc warnings. */
-#define UNUSED __attribute__((__unused__))
-
-/* Make available the bool type. */
-#if INN_HAVE_STDBOOL_H
-# include <stdbool.h>
-#else
-# undef true
-# undef false
-# define true (1)
-# define false (0)
-# ifndef __cplusplus
-# define bool int
-# endif
-#endif /* INN_HAVE_STDBOOL_H */
-
-#include <stdlib.h>
-#include <string.h>
-#include <stdarg.h>
-#include <stdio.h>
-#include <errno.h>
-#include <syslog.h>
-#include <crypt.h>
-#include <fcntl.h>
-#include <pwd.h>
-#include <grp.h>
-
-/* The functions are actually macros so that we can pick up the file and line
- number information for debugging error messages without the user having to
- pass those in every time. */
-#define xcalloc(n, size) x_calloc((n), (size), __FILE__, __LINE__)
-#define xmalloc(size) x_malloc((size), __FILE__, __LINE__)
-#define xrealloc(p, size) x_realloc((p), (size), __FILE__, __LINE__)
-#define xstrdup(p) x_strdup((p), __FILE__, __LINE__)
-#define xstrndup(p, size) x_strndup((p), (size), __FILE__, __LINE__)
-
-/* These are the currently-supported types of traces. */
-enum message_trace {
- TRACE_NETWORK, /* Network traffic. */
- TRACE_PROGRAM, /* Stages of program execution. */
- TRACE_ALL /* All traces; this must be last. */
-};
-
-/* The reporting functions. The ones prefaced by "sys" add a colon, a space,
- and the results of strerror(errno) to the output and are intended for
- reporting failures of system calls. */
-extern void trace(enum message_trace, const char *, ...)
- __attribute__((__format__(printf, 2, 3)));
-extern void notice(const char *, ...)
- __attribute__((__format__(printf, 1, 2)));
-extern void sysnotice(const char *, ...)
- __attribute__((__format__(printf, 1, 2)));
-extern void warn(const char *, ...)
- __attribute__((__format__(printf, 1, 2)));
-extern void syswarn(const char *, ...)
- __attribute__((__format__(printf, 1, 2)));
-extern void die(const char *, ...)
- __attribute__((__noreturn__, __format__(printf, 1, 2)));
-extern void sysdie(const char *, ...)
- __attribute__((__noreturn__, __format__(printf, 1, 2)));
-
-/* Debug is handled specially, since we want to make the code disappear
- completely unless we're built with -DDEBUG. We can only do that with
- support for variadic macros, though; otherwise, the function just won't do
- anything. */
-#if !defined(DEBUG) && (INN_HAVE_C99_VAMACROS || INN_HAVE_GNU_VAMACROS)
-# if INN_HAVE_C99_VAMACROS
-# define debug(format, ...) /* empty */
-# elif INN_HAVE_GNU_VAMACROS
-# define debug(format, args...) /* empty */
-# endif
-#else
-extern void debug(const char *, ...)
- __attribute__((__format__(printf, 1, 2)));
-#endif
-
-/* Set the handlers for various message functions. All of these functions
- take a count of the number of handlers and then function pointers for each
- of those handlers. These functions are not thread-safe; they set global
- variables. */
-extern void message_handlers_debug(int count, ...);
-extern void message_handlers_trace(int count, ...);
-extern void message_handlers_notice(int count, ...);
-extern void message_handlers_warn(int count, ...);
-extern void message_handlers_die(int count, ...);
-
-/* Enable or disable tracing for particular classes of messages. */
-extern void message_trace_enable(enum message_trace, bool);
-
-/* Some useful handlers, intended to be passed to message_handlers_*. All
- handlers take the length of the formatted message, the format, a variadic
- argument list, and the errno setting if any. */
-extern void message_log_stdout(int, const char *, va_list, int);
-extern void message_log_stderr(int, const char *, va_list, int);
-extern void message_log_syslog_debug(int, const char *, va_list, int);
-extern void message_log_syslog_info(int, const char *, va_list, int);
-extern void message_log_syslog_notice(int, const char *, va_list, int);
-extern void message_log_syslog_warning(int, const char *, va_list, int);
-extern void message_log_syslog_err(int, const char *, va_list, int);
-extern void message_log_syslog_crit(int, const char *, va_list, int);
-
-/* The type of a message handler. */
-typedef void (*message_handler_func)(int, const char *, va_list, int);
-
-/* If non-NULL, called before exit and its return value passed to exit. */
-extern int (*message_fatal_cleanup)(void);
-
-/* If non-NULL, prepended (followed by ": ") to all messages printed by either
- message_log_stdout or message_log_stderr. */
-extern const char *message_program_name;
-
-/* The default handler lists. */
-static message_handler_func stdout_handlers[2] = {
- message_log_stdout, NULL
-};
-static message_handler_func stderr_handlers[2] = {
- message_log_stderr, NULL
-};
-
-/* The list of logging functions currently in effect. */
-static message_handler_func *debug_handlers = NULL;
-static message_handler_func *trace_handlers = NULL;
-static message_handler_func *notice_handlers = stdout_handlers;
-static message_handler_func *warn_handlers = stderr_handlers;
-static message_handler_func *die_handlers = stderr_handlers;
-
-/* If non-NULL, called before exit and its return value passed to exit. */
-int (*message_fatal_cleanup)(void) = NULL;
-
-/* If non-NULL, prepended (followed by ": ") to messages. */
-const char *message_program_name = NULL;
-
-/* Whether or not we're currently outputting a particular type of trace. */
-static bool tracing[TRACE_ALL] = { false /* false, ... */ };
-
-
-/*
-** Set the handlers for a particular message function. Takes a pointer to
-** the handler list, the count of handlers, and the argument list.
-*/
-static void
-message_handlers(message_handler_func **list, int count, va_list args)
-{
- int i;
-
- if (*list != stdout_handlers && *list != stderr_handlers)
- free(*list);
- *list = xmalloc(sizeof(message_handler_func) * (count + 1));
- for (i = 0; i < count; i++)
- (*list)[i] = (message_handler_func) va_arg(args, message_handler_func);
- (*list)[count] = NULL;
-}
-
-
-/*
-** There's no good way of writing these handlers without a bunch of code
-** duplication since we can't assume variadic macros, but I can at least make
-** it easier to write and keep them consistent.
-*/
-#define HANDLER_FUNCTION(type) \
- void \
- message_handlers_ ## type(int count, ...) \
- { \
- va_list args; \
- \
- va_start(args, count); \
- message_handlers(& type ## _handlers, count, args); \
- va_end(args); \
- }
-HANDLER_FUNCTION(debug)
-HANDLER_FUNCTION(trace)
-HANDLER_FUNCTION(notice)
-HANDLER_FUNCTION(warn)
-HANDLER_FUNCTION(die)
-
-
-/*
-** Print a message to stdout, supporting message_program_name.
-*/
-void
-message_log_stdout(int len UNUSED, const char *fmt, va_list args, int err)
-{
- if (message_program_name != NULL)
- fprintf(stdout, "%s: ", message_program_name);
- vfprintf(stdout, fmt, args);
- if (err)
- fprintf(stdout, ": %s", strerror(err));
- fprintf(stdout, "\n");
-}
-
-
-/*
-** Print a message to stderr, supporting message_program_name. Also flush
-** stdout so that errors and regular output occur in the right order.
-*/
-void
-message_log_stderr(int len UNUSED, const char *fmt, va_list args, int err)
-{
- fflush(stdout);
- if (message_program_name != NULL)
- fprintf(stderr, "%s: ", message_program_name);
- vfprintf(stderr, fmt, args);
- if (err)
- fprintf(stderr, ": %s", strerror(err));
- fprintf(stderr, "\n");
-}
-
-
-/*
-** Log a message to syslog. This is a helper function used to implement all
-** of the syslog message log handlers. It takes the same arguments as a
-** regular message handler function but with an additional priority
-** argument.
-*/
-static void
-message_log_syslog(int pri, int len, const char *fmt, va_list args, int err)
-{
- char *buffer;
-
- buffer = malloc(len + 1);
- if (buffer == NULL) {
- fprintf(stderr, "failed to malloc %u bytes at %s line %d: %s",
- len + 1, __FILE__, __LINE__, strerror(errno));
- exit(message_fatal_cleanup ? (*message_fatal_cleanup)() : 1);
- }
- vsnprintf(buffer, len + 1, fmt, args);
- syslog(pri, err ? "%s: %m" : "%s", buffer);
- free(buffer);
-}
-
-
-/*
-** Do the same sort of wrapper to generate all of the separate syslog logging
-** functions.
-*/
-#define SYSLOG_FUNCTION(name, type) \
- void \
- message_log_syslog_ ## name(int l, const char *f, va_list a, int e) \
- { \
- message_log_syslog(LOG_ ## type, l, f, a, e); \
- }
-SYSLOG_FUNCTION(debug, DEBUG)
-SYSLOG_FUNCTION(info, INFO)
-SYSLOG_FUNCTION(notice, NOTICE)
-SYSLOG_FUNCTION(warning, WARNING)
-SYSLOG_FUNCTION(err, ERR)
-SYSLOG_FUNCTION(crit, CRIT)
-
-
-/*
-** Enable or disable tracing for particular classes of messages.
-*/
-void
-message_trace_enable(enum message_trace type, bool enable)
-{
- if (type > TRACE_ALL)
- return;
- if (type == TRACE_ALL) {
- int i;
-
- for (i = 0; i < TRACE_ALL; i++)
- tracing[i] = enable;
- } else {
- tracing[type] = enable;
- }
-}
-
-
-/*
-** All of the message handlers. There's a lot of code duplication here too,
-** but each one is still *slightly* different and va_start has to be called
-** multiple times, so it's hard to get rid of the duplication.
-*/
-
-#ifdef DEBUG
-void
-debug(const char *format, ...)
-{
- va_list args;
- message_handler_func *log;
- int length;
-
- if (debug_handlers == NULL)
- return;
- va_start(args, format);
- length = vsnprintf(NULL, 0, format, args);
- va_end(args);
- if (length < 0)
- return;
- for (log = debug_handlers; *log != NULL; log++) {
- va_start(args, format);
- (**log)(length, format, args, 0);
- va_end(args);
- }
-}
-#elif !INN_HAVE_C99_VAMACROS && !INN_HAVE_GNU_VAMACROS
-void debug(const char *format UNUSED, ...) { }
-#endif
-
-void
-trace(enum message_trace type, const char *format, ...)
-{
- va_list args;
- message_handler_func *log;
- int length;
-
- if (trace_handlers == NULL || !tracing[type])
- return;
- va_start(args, format);
- length = vsnprintf(NULL, 0, format, args);
- va_end(args);
- if (length < 0)
- return;
- for (log = trace_handlers; *log != NULL; log++) {
- va_start(args, format);
- (**log)(length, format, args, 0);
- va_end(args);
- }
-}
-
-void
-notice(const char *format, ...)
-{
- va_list args;
- message_handler_func *log;
- int length;
-
- va_start(args, format);
- length = vsnprintf(NULL, 0, format, args);
- va_end(args);
- if (length < 0)
- return;
- for (log = notice_handlers; *log != NULL; log++) {
- va_start(args, format);
- (**log)(length, format, args, 0);
- va_end(args);
- }
-}
-
-void
-sysnotice(const char *format, ...)
-{
- va_list args;
- message_handler_func *log;
- int length;
- int error = errno;
-
- va_start(args, format);
- length = vsnprintf(NULL, 0, format, args);
- va_end(args);
- if (length < 0)
- return;
- for (log = notice_handlers; *log != NULL; log++) {
- va_start(args, format);
- (**log)(length, format, args, error);
- va_end(args);
- }
-}
-
-void
-warn(const char *format, ...)
-{
- va_list args;
- message_handler_func *log;
- int length;
-
- va_start(args, format);
- length = vsnprintf(NULL, 0, format, args);
- va_end(args);
- if (length < 0)
- return;
- for (log = warn_handlers; *log != NULL; log++) {
- va_start(args, format);
- (**log)(length, format, args, 0);
- va_end(args);
- }
-}
-
-void
-syswarn(const char *format, ...)
-{
- va_list args;
- message_handler_func *log;
- int length;
- int error = errno;
-
- va_start(args, format);
- length = vsnprintf(NULL, 0, format, args);
- va_end(args);
- if (length < 0)
- return;
- for (log = warn_handlers; *log != NULL; log++) {
- va_start(args, format);
- (**log)(length, format, args, error);
- va_end(args);
- }
-}
-
-void
-die(const char *format, ...)
-{
- va_list args;
- message_handler_func *log;
- int length;
-
- va_start(args, format);
- length = vsnprintf(NULL, 0, format, args);
- va_end(args);
- if (length >= 0)
- for (log = die_handlers; *log != NULL; log++) {
- va_start(args, format);
- (**log)(length, format, args, 0);
- va_end(args);
- }
- exit(message_fatal_cleanup ? (*message_fatal_cleanup)() : 1);
-}
-
-void
-sysdie(const char *format, ...)
-{
- va_list args;
- message_handler_func *log;
- int length;
- int error = errno;
-
- va_start(args, format);
- length = vsnprintf(NULL, 0, format, args);
- va_end(args);
- if (length >= 0)
- for (log = die_handlers; *log != NULL; log++) {
- va_start(args, format);
- (**log)(length, format, args, error);
- va_end(args);
- }
- exit(message_fatal_cleanup ? (*message_fatal_cleanup)() : 1);
-}
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