-/* $Cambridge: exim/src/src/log.c,v 1.14 2009/11/16 19:50:37 nm4 Exp $ */
-
/*************************************************
* Exim - an Internet mail transport agent *
*************************************************/
-/* Copyright (c) University of Cambridge 1995 - 2009 */
+/* Copyright (c) University of Cambridge 1995 - 2016 */
/* See the file NOTICE for conditions of use and distribution. */
/* Functions for writing log files. The code for maintaining datestamped
#define LOG_MODE_FILE 1
#define LOG_MODE_SYSLOG 2
-enum { lt_main, lt_reject, lt_panic, lt_process };
+enum { lt_main, lt_reject, lt_panic, lt_debug };
-static uschar *log_names[] = { US"main", US"reject", US"panic", US"process" };
+static uschar *log_names[] = { US"main", US"reject", US"panic", US"debug" };
static uschar mainlog_name[LOG_NAME_SIZE];
static uschar rejectlog_name[LOG_NAME_SIZE];
+static uschar debuglog_name[LOG_NAME_SIZE];
static uschar *mainlog_datestamp = NULL;
static uschar *rejectlog_datestamp = NULL;
static int logging_mode = LOG_MODE_FILE;
static uschar *file_path = US"";
-
-
+static size_t pid_position[2];
+
+
+/* These should be kept in-step with the private delivery error
+number definitions in macros.h */
+
+static const uschar * exim_errstrings[] = {
+ US"",
+ US"unknown error",
+ US"user slash",
+ US"exist race",
+ US"not regular",
+ US"not directory",
+ US"bad ugid",
+ US"bad mode",
+ US"inode changed",
+ US"lock failed",
+ US"bad address2",
+ US"forbid pipe",
+ US"forbid file",
+ US"forbid reply",
+ US"missing pipe",
+ US"missing file",
+ US"missing reply",
+ US"bad redirect",
+ US"smtp closed",
+ US"smtp format",
+ US"spool format",
+ US"not absolute",
+ US"Exim-imposed quota",
+ US"held",
+ US"Delivery filter process failure",
+ US"Delivery add/remove header failure",
+ US"Delivery write incomplete error",
+ US"Some expansion failed",
+ US"Failed to get gid",
+ US"Failed to get uid",
+ US"Unset or non-existent transport",
+ US"MBX length mismatch",
+ US"Lookup failed routing or in smtp tpt",
+ US"Can't match format in appendfile",
+ US"Creation outside home in appendfile",
+ US"Can't check a list; lookup defer",
+ US"DNS lookup defer",
+ US"Failed to start TLS session",
+ US"Mandatory TLS session not started",
+ US"Failed to chown a file",
+ US"Failed to create a pipe",
+ US"When verifying",
+ US"When required by client",
+ US"Used internally in smtp transport",
+ US"RCPT gave 4xx error",
+ US"MAIL gave 4xx error",
+ US"DATA gave 4xx error",
+ US"Negotiation failed for proxy configured host",
+ US"Authenticator 'other' failure",
+ US"target not supporting SMTPUTF8",
+ US"",
+
+ US"Not time for routing",
+ US"Not time for local delivery",
+ US"Not time for any remote host",
+ US"Local-only delivery",
+ US"Domain in queue_domains",
+ US"Transport concurrency limit",
+};
+
+
+/************************************************/
+const uschar *
+exim_errstr(int err)
+{
+return err < 0 ? exim_errstrings[-err] : CUS strerror(err);
+}
/*************************************************
* Write to syslog *
Arguments:
priority syslog priority
- s the string to be written
+ s the string to be written, the string may be modified!
Returns: nothing
*/
if (running_in_test_harness) return;
if (!syslog_timestamp) s += log_timezone? 26 : 20;
+if (!syslog_pid && LOGGING(pid))
+ memmove(s + pid_position[0], s + pid_position[1], pid_position[1] - pid_position[0]);
len = Ustrlen(s);
Returns: a file descriptor, or < 0 on failure (errno set)
*/
-static int
-create_log(uschar *name)
+int
+log_create(uschar *name)
{
-int fd = Uopen(name, O_CREAT|O_APPEND|O_WRONLY, LOG_MODE);
+int fd = Uopen(name,
+#ifdef O_CLOEXEC
+ O_CLOEXEC |
+#endif
+ O_CREAT|O_APPEND|O_WRONLY, LOG_MODE);
/* If creation failed, attempt to build a log directory in case that is the
problem. */
DEBUG(D_any) debug_printf("%s log directory %s\n",
created? "created" : "failed to create", name);
*lastslash = '/';
- if (created) fd = Uopen(name, O_CREAT|O_APPEND|O_WRONLY, LOG_MODE);
+ if (created) fd = Uopen(name,
+#ifdef O_CLOEXEC
+ O_CLOEXEC |
+#endif
+ O_CREAT|O_APPEND|O_WRONLY, LOG_MODE);
}
return fd;
+/*************************************************
+* Create a log file as the exim user *
+*************************************************/
+
+/* This function is called when we are root to spawn an exim:exim subprocess
+in which we can create a log file. It must be signal-safe since it is called
+by the usr1_handler().
+
+Arguments:
+ name the file name
+
+Returns: a file descriptor, or < 0 on failure (errno set)
+*/
+
+int
+log_create_as_exim(uschar *name)
+{
+pid_t pid = fork();
+int status = 1;
+int fd = -1;
+
+/* In the subprocess, change uid/gid and do the creation. Return 0 from the
+subprocess on success. If we don't check for setuid failures, then the file
+can be created as root, so vulnerabilities which cause setuid to fail mean
+that the Exim user can use symlinks to cause a file to be opened/created as
+root. We always open for append, so can't nuke existing content but it would
+still be Rather Bad. */
+
+if (pid == 0)
+ {
+ if (setgid(exim_gid) < 0)
+ die(US"exim: setgid for log-file creation failed, aborting",
+ US"Unexpected log failure, please try later");
+ if (setuid(exim_uid) < 0)
+ die(US"exim: setuid for log-file creation failed, aborting",
+ US"Unexpected log failure, please try later");
+ _exit((log_create(name) < 0)? 1 : 0);
+ }
+
+/* If we created a subprocess, wait for it. If it succeeded, try the open. */
+
+while (pid > 0 && waitpid(pid, &status, 0) != pid);
+if (status == 0) fd = Uopen(name,
+#ifdef O_CLOEXEC
+ O_CLOEXEC |
+#endif
+ O_APPEND|O_WRONLY, LOG_MODE);
+
+/* If we failed to create a subprocess, we are in a bad way. We return
+with fd still < 0, and errno set, letting the caller handle the error. */
+
+return fd;
+}
+
+
+
/*************************************************
* Open a log file *
*************************************************/
-/* This function opens one of a number of logs, which all (except for the
-"process log") reside in the same directory, creating the directory if it does
-not exist. This may be called recursively on failure, in order to open the
-panic log.
+/* This function opens one of a number of logs, creating the log directory if
+it does not exist. This may be called recursively on failure, in order to open
+the panic log.
The directory is in the static variable file_path. This is static so that it
the work of sorting out the path is done just once per Exim process.
Arguments:
fd where to return the resulting file descriptor
- type lt_main, lt_reject, lt_panic, or lt_process
+ type lt_main, lt_reject, lt_panic, or lt_debug
+ tag optional tag to include in the name (only hooked up for debug)
Returns: nothing
*/
static void
-open_log(int *fd, int type)
+open_log(int *fd, int type, uschar *tag)
{
uid_t euid;
-BOOL ok;
+BOOL ok, ok2;
uschar buffer[LOG_NAME_SIZE];
-/* Sort out the file name. This depends on the type of log we are opening. The
-process "log" is written in the spool directory by default, but a path name can
-be specified in the configuration. */
+/* The names of the log files are controlled by file_path. The panic log is
+written to the same directory as the main and reject logs, but its name does
+not have a datestamp. The use of datestamps is indicated by %D/%M in file_path.
+When opening the panic log, if %D or %M is present, we remove the datestamp
+from the generated name; if it is at the start, remove a following
+non-alphanumeric character as well; otherwise, remove a preceding
+non-alphanumeric character. This is definitely kludgy, but it sort of does what
+people want, I hope. */
+
+ok = string_format(buffer, sizeof(buffer), CS file_path, log_names[type]);
-if (type == lt_process)
+/* Save the name of the mainlog for rollover processing. Without a datestamp,
+it gets statted to see if it has been cycled. With a datestamp, the datestamp
+will be compared. The static slot for saving it is the same size as buffer,
+and the text has been checked above to fit, so this use of strcpy() is OK. */
+
+if (type == lt_main)
{
- if (process_log_path == NULL)
- ok = string_format(buffer, sizeof(buffer), "%s/exim-process.info",
- spool_directory);
- else
- ok = string_format(buffer, sizeof(buffer), "%s", process_log_path);
+ Ustrcpy(mainlog_name, buffer);
+ mainlog_datestamp = mainlog_name + string_datestamp_offset;
}
-/* The names of the other three logs are controlled by file_path. The panic log
-is written to the same directory as the main and reject logs, but its name does
-not have a datestamp. The use of datestamps is indicated by %D in file_path.
-When opening the panic log, if %D is present, we remove the datestamp from the
-generated name; if it is at the start, remove a following non-alphameric
-character as well; otherwise, remove a preceding non-alphameric character. This
-is definitely kludgy, but it sort of does what people want, I hope. */
+/* Ditto for the reject log */
-else
+else if (type == lt_reject)
{
- ok = string_format(buffer, sizeof(buffer), CS file_path, log_names[type]);
+ Ustrcpy(rejectlog_name, buffer);
+ rejectlog_datestamp = rejectlog_name + string_datestamp_offset;
+ }
- /* Save the name of the mainlog for rollover processing. Without a datestamp,
- it gets statted to see if it has been cycled. With a datestamp, the datestamp
- will be compared. The static slot for saving it is the same size as buffer,
- and the text has been checked above to fit, so this use of strcpy() is OK. */
+/* and deal with the debug log (which keeps the datestamp, but does not
+update it) */
- if (type == lt_main)
+else if (type == lt_debug)
+ {
+ Ustrcpy(debuglog_name, buffer);
+ if (tag)
{
- Ustrcpy(mainlog_name, buffer);
- mainlog_datestamp = mainlog_name + string_datestamp_offset;
+ /* this won't change the offset of the datestamp */
+ ok2 = string_format(buffer, sizeof(buffer), "%s%s",
+ debuglog_name, tag);
+ if (ok2)
+ Ustrcpy(debuglog_name, buffer);
}
+ }
- /* Ditto for the reject log */
+/* Remove any datestamp if this is the panic log. This is rare, so there's no
+need to optimize getting the datestamp length. We remove one non-alphanumeric
+char afterwards if at the start, otherwise one before. */
- else if (type == lt_reject)
+else if (string_datestamp_offset >= 0)
+ {
+ uschar *from = buffer + string_datestamp_offset;
+ uschar *to = from + string_datestamp_length;
+ if (from == buffer || from[-1] == '/')
{
- Ustrcpy(rejectlog_name, buffer);
- rejectlog_datestamp = rejectlog_name + string_datestamp_offset;
+ if (!isalnum(*to)) to++;
}
-
- /* Remove any datestamp if this is the panic log. This is rare, so there's no
- need to optimize getting the datestamp length. We remove one non-alphanumeric
- char afterwards if at the start, otherwise one before. */
-
- else if (string_datestamp_offset >= 0)
+ else
{
- uschar *from = buffer + string_datestamp_offset;
- uschar *to = from + Ustrlen(tod_stamp(tod_log_datestamp));
- if (from == buffer || from[-1] == '/')
- {
- if (!isalnum(*to)) to++;
- }
- else
- {
- if (!isalnum(from[-1])) from--;
- }
+ if (!isalnum(from[-1])) from--;
+ }
- /* This strcpy is ok, because we know that to is a substring of from. */
+ /* This strcpy is ok, because we know that to is a substring of from. */
- Ustrcpy(from, to);
- }
+ Ustrcpy(from, to);
}
/* If the file name is too long, it is an unrecoverable disaster */
/* We now have the file name. Try to open an existing file. After a successful
open, arrange for automatic closure on exec(), and then return. */
-*fd = Uopen(buffer, O_APPEND|O_WRONLY, LOG_MODE);
+*fd = Uopen(buffer,
+#ifdef O_CLOEXEC
+ O_CLOEXEC |
+#endif
+ O_APPEND|O_WRONLY, LOG_MODE);
if (*fd >= 0)
{
+#ifndef O_CLOEXEC
(void)fcntl(*fd, F_SETFD, fcntl(*fd, F_GETFD) | FD_CLOEXEC);
+#endif
return;
}
/* If we are already running as the Exim user (even if that user is root),
we can go ahead and create in the current process. */
-if (euid == exim_uid) *fd = create_log(buffer);
+if (euid == exim_uid) *fd = log_create(buffer);
/* Otherwise, if we are root, do the creation in an exim:exim subprocess. If we
are neither exim nor root, creation is not attempted. */
-else if (euid == root_uid)
- {
- int status;
- pid_t pid = fork();
-
- /* In the subprocess, change uid/gid and do the creation. Return 0 from the
- subprocess on success. There doesn't seem much point in testing for setgid
- and setuid errors. */
-
- if (pid == 0)
- {
- (void)setgid(exim_gid);
- (void)setuid(exim_uid);
- _exit((create_log(buffer) < 0)? 1 : 0);
- }
-
- /* If we created a subprocess, wait for it. If it succeeded retry the open. */
-
- if (pid > 0)
- {
- while (waitpid(pid, &status, 0) != pid);
- if (status == 0) *fd = Uopen(buffer, O_APPEND|O_WRONLY, LOG_MODE);
- }
-
- /* If we failed to create a subprocess, we are in a bad way. We fall through
- with *fd still < 0, and errno set, letting the code below handle the error. */
- }
+else if (euid == root_uid) *fd = log_create_as_exim(buffer);
/* If we now have an open file, set the close-on-exec flag and return. */
if (*fd >= 0)
{
+#ifndef O_CLOEXEC
(void)fcntl(*fd, F_SETFD, fcntl(*fd, F_GETFD) | FD_CLOEXEC);
+#endif
return;
}
are recursing (can't open the panic log either), the pointer will already be
set. */
-if (panic_save_buffer == NULL)
- {
- panic_save_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
- if (panic_save_buffer != NULL)
+if (!panic_save_buffer)
+ if ((panic_save_buffer = US malloc(LOG_BUFFER_SIZE)))
memcpy(panic_save_buffer, log_buffer, LOG_BUFFER_SIZE);
- }
log_write(0, LOG_PANIC_DIE, "Cannot open %s log file \"%s\": %s: "
"euid=%d egid=%d", log_names[type], buffer, strerror(errno), euid, getegid());
}
+static void
+unlink_log(int type)
+{
+if (type == lt_debug) unlink(CS debuglog_name);
+}
+
+
/*************************************************
* Add configuration file info to log line *
We try to save the relevant message in the panic_save buffer before crashing
out.
+The potential invoker should probably not call us for EINTR -1 writes. But
+otherwise, short writes are bad as we don't do non-blocking writes to fds
+subject to flow control. (If we do, that's new and the logic of this should
+be reconsidered).
+
Arguments:
name the name of the log being written
length the string length being written
{
int save_errno = errno;
-if (panic_save_buffer == NULL)
- {
- panic_save_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
- if (panic_save_buffer != NULL)
+if (!panic_save_buffer)
+ if ((panic_save_buffer = US malloc(LOG_BUFFER_SIZE)))
memcpy(panic_save_buffer, log_buffer, LOG_BUFFER_SIZE);
- }
log_write(0, LOG_PANIC_DIE, "failed to write to %s: length=%d result=%d "
"errno=%d (%s)", name, length, rc, save_errno,
+/*************************************************
+* Write to an fd, retrying after signals *
+*************************************************/
+
+/* Basic write to fd for logs, handling EINTR.
+
+Arguments:
+ fd the fd to write to
+ buf the string to write
+ length the string length being written
+
+Returns:
+ length actually written, persisting an errno from write()
+*/
+ssize_t
+write_to_fd_buf(int fd, const uschar *buf, size_t length)
+{
+ssize_t wrote;
+size_t total_written = 0;
+const uschar *p = buf;
+size_t left = length;
+
+while (1)
+ {
+ wrote = write(fd, p, left);
+ if (wrote == (ssize_t)-1)
+ {
+ if (errno == EINTR) continue;
+ return wrote;
+ }
+ total_written += wrote;
+ if (wrote == left)
+ break;
+ else
+ {
+ p += wrote;
+ left -= wrote;
+ }
+ }
+return total_written;
+}
+
+
+
+static void
+set_file_path(void)
+{
+int sep = ':'; /* Fixed separator - outside use */
+uschar *t;
+const uschar *tt = US LOG_FILE_PATH;
+while ((t = string_nextinlist(&tt, &sep, log_buffer, LOG_BUFFER_SIZE)))
+ {
+ if (Ustrcmp(t, "syslog") == 0 || t[0] == 0) continue;
+ file_path = string_copy(t);
+ break;
+ }
+}
+
+
+void
+mainlog_close(void)
+{
+if (mainlogfd < 0) return;
+(void)close(mainlogfd);
+mainlogfd = -1;
+mainlog_inode = 0;
+}
+
/*************************************************
* Write message to log file *
*************************************************/
log_file_path = "syslog" write to syslog
log_file_path = "syslog : xxx" write to syslog and to files (any order)
-The one exception to this is messages containing LOG_PROCESS. These are always
-written to exim-process.info in the spool directory. They aren't really log
-messages in the same sense as the others.
-
The message always gets '\n' added on the end of it, since more than one
process may be writing to the log at once and we don't want intermingling to
happen in the middle of lines. To be absolutely sure of this we write the data
denied.
Avoid actually writing to the logs when exim is called with -bv or -bt to
-test an address, but take other actions, such as panicing.
+test an address, but take other actions, such as panicking.
In Exim proper, the buffer for building the message is got at start-up, so that
nothing gets done if it can't be got. However, some functions that are also
Arguments:
selector write to main log or LOG_INFO only if this value is zero, or if
- its bit is set in log_write_selector
+ its bit is set in log_selector[0]
flags each bit indicates some independent action:
LOG_SENDER add raw sender to the message
LOG_RECIPIENTS add raw recipients list to message
LOG_REJECT write to reject log or syslog LOG_NOTICE
LOG_PANIC write to panic log or syslog LOG_ALERT
LOG_PANIC_DIE write to panic log or LOG_ALERT and then crash
- LOG_PROCESS write to process log (always a file)
format a printf() format
... arguments for format
*/
void
-log_write(unsigned int selector, int flags, char *format, ...)
+log_write(unsigned int selector, int flags, const char *format, ...)
{
uschar *ptr;
-int length, rc;
+int length;
int paniclogfd;
+ssize_t written_len;
va_list ap;
/* If panic_recurseflag is set, we have failed to open the panic log. This is
/* Ensure we have a buffer (see comment above); this should never be obeyed
when running Exim proper, only when running utilities. */
-if (log_buffer == NULL)
- {
- log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
- if (log_buffer == NULL)
+if (!log_buffer)
+ if (!(log_buffer = US malloc(LOG_BUFFER_SIZE)))
{
fprintf(stderr, "exim: failed to get store for log buffer\n");
exim_exit(EXIT_FAILURE);
}
- }
/* If we haven't already done so, inspect the setting of log_file_path to
determine whether to log to files and/or to syslog. Bits in logging_mode
/* If nothing has been set, don't waste effort... the default values for the
statics are file_path="" and logging_mode = LOG_MODE_FILE. */
- if (log_file_path[0] != 0)
+ if (*log_file_path)
{
int sep = ':'; /* Fixed separator - outside use */
uschar *s;
- uschar *ss = log_file_path;
+ const uschar *ss = log_file_path;
logging_mode = 0;
- while ((s = string_nextinlist(&ss,&sep,log_buffer,LOG_BUFFER_SIZE)) != NULL)
+ while ((s = string_nextinlist(&ss, &sep, log_buffer, LOG_BUFFER_SIZE)))
{
if (Ustrcmp(s, "syslog") == 0)
logging_mode |= LOG_MODE_SYSLOG;
/* If a non-empty path is given, use it */
- if (s[0] != 0)
- {
+ if (*s)
file_path = string_copy(s);
- }
/* If the path is empty, we want to use the first non-empty, non-
syslog item in LOG_FILE_PATH, if there is one, since the value of
use the ultimate default in the spool directory. */
else
- {
- uschar *t;
- uschar *tt = US LOG_FILE_PATH;
- while ((t = string_nextinlist(&tt,&sep,log_buffer,LOG_BUFFER_SIZE))
- != NULL)
- {
- if (Ustrcmp(t, "syslog") == 0 || t[0] == 0) continue;
- file_path = string_copy(t);
- break;
- }
- } /* Empty item in log_file_path */
+ set_file_path(); /* Empty item in log_file_path */
} /* First non-syslog item in log_file_path */
} /* Scan of log_file_path */
}
should work since we have now set up the routing. */
if (multiple)
- {
log_write(0, LOG_MAIN|LOG_PANIC,
"More than one path given in log_file_path: using %s", file_path);
- }
}
/* If debugging, show all log entries, but don't show headers. Do it all
Ustrcpy(ptr, "LOG:");
ptr += 4;
- /* Show the options that were passed into the call. These are those whose
- flag values do not have the 0x80000000 bit in them. Note that this
- automatically exclude the "all" setting. */
+ /* Show the selector that was passed into the call. */
for (i = 0; i < log_options_count; i++)
{
- unsigned int bit = log_options[i].bit;
- if ((bit & 0x80000000) != 0) continue;
- if ((selector & bit) != 0)
+ unsigned int bitnum = log_options[i].bit;
+ if (bitnum < BITWORDSIZE && selector == BIT(bitnum))
{
*ptr++ = ' ';
Ustrcpy(ptr, log_options[i].name);
}
}
- sprintf(CS ptr, "%s%s%s%s%s\n ",
+ sprintf(CS ptr, "%s%s%s%s\n ",
((flags & LOG_MAIN) != 0)? " MAIN" : "",
((flags & LOG_PANIC) != 0)? " PANIC" : "",
((flags & LOG_PANIC_DIE) == LOG_PANIC_DIE)? " DIE" : "",
- ((flags & LOG_PROCESS) != 0)? " PROCESS": "",
((flags & LOG_REJECT) != 0)? " REJECT" : "");
while(*ptr) ptr++;
/* If no log file is specified, we are in a mess. */
-if ((flags & (LOG_MAIN|LOG_PANIC|LOG_REJECT|LOG_PROCESS)) == 0)
+if ((flags & (LOG_MAIN|LOG_PANIC|LOG_REJECT)) == 0)
log_write(0, LOG_MAIN|LOG_PANIC_DIE, "log_write called with no log "
"flags set");
if (!write_rejectlog) flags &= ~LOG_REJECT;
-/* Create the main message in the log buffer, including the message
-id except for the process log and when called by a utility. */
+/* Create the main message in the log buffer. Do not include the message id
+when called by a utility. */
ptr = log_buffer;
sprintf(CS ptr, "%s ", tod_stamp(tod_log));
while(*ptr) ptr++;
-if ((log_extra_selector & LX_pid) != 0)
+if (LOGGING(pid))
{
sprintf(CS ptr, "[%d] ", (int)getpid());
+ if (!syslog_pid) pid_position[0] = ptr - log_buffer; /* remember begin … */
while (*ptr) ptr++;
+ if (!syslog_pid) pid_position[1] = ptr - log_buffer; /* … and end+1 of the PID */
}
-if (really_exim && (flags & LOG_PROCESS) == 0 && message_id[0] != 0)
+if (really_exim && message_id[0] != 0)
{
sprintf(CS ptr, "%s ", message_id);
while(*ptr) ptr++;
if (!really_exim || log_testing_mode)
{
if (debug_selector == 0 && log_stderr != NULL &&
- (selector == 0 || (selector & log_write_selector) != 0))
+ (selector == 0 || (selector & log_selector[0]) != 0))
{
if (host_checking)
fprintf(log_stderr, "LOG: %s", CS(log_buffer + 20)); /* no timestamp */
has been renamed. Therefore, do a stat() and see if the inode has changed, and
if so, re-open. */
-if ((flags & LOG_MAIN) != 0 &&
- (selector == 0 || (selector & log_write_selector) != 0))
+if ( flags & LOG_MAIN
+ && (!selector || selector & log_selector[0]))
{
- if ((logging_mode & LOG_MODE_SYSLOG) != 0 &&
- (syslog_duplication || (flags & (LOG_REJECT|LOG_PANIC)) == 0))
+ if ( logging_mode & LOG_MODE_SYSLOG
+ && (syslog_duplication || !(flags & (LOG_REJECT|LOG_PANIC))))
write_syslog(LOG_INFO, log_buffer);
- if ((logging_mode & LOG_MODE_FILE) != 0)
+ if (logging_mode & LOG_MODE_FILE)
{
struct stat statbuf;
if (mainlog_datestamp != NULL)
{
- uschar *nowstamp = tod_stamp(tod_log_datestamp);
+ uschar *nowstamp = tod_stamp(string_datestamp_type);
if (Ustrncmp (mainlog_datestamp, nowstamp, Ustrlen(nowstamp)) != 0)
{
(void)close(mainlogfd); /* Close the file */
happening. */
if (mainlogfd >= 0)
- {
if (Ustat(mainlog_name, &statbuf) < 0 || statbuf.st_ino != mainlog_inode)
- {
- (void)close(mainlogfd);
- mainlogfd = -1;
- mainlog_inode = 0;
- }
- }
+ mainlog_close();
/* If the log is closed, open it. Then write the line. */
if (mainlogfd < 0)
{
- open_log(&mainlogfd, lt_main); /* No return on error */
+ open_log(&mainlogfd, lt_main, NULL); /* No return on error */
if (fstat(mainlogfd, &statbuf) >= 0) mainlog_inode = statbuf.st_ino;
}
/* Failing to write to the log is disastrous */
- if ((rc = write(mainlogfd, log_buffer, length)) != length)
+ written_len = write_to_fd_buf(mainlogfd, log_buffer, length);
+ if (written_len != length)
{
- log_write_failed(US"main log", length, rc);
+ log_write_failed(US"main log", length, written_len);
/* That function does not return */
}
}
{
header_line *h;
- if (header_list != NULL && (log_extra_selector & LX_rejected_header) != 0)
+ if (header_list != NULL && LOGGING(rejected_header))
{
if (recipients_count > 0)
{
if (rejectlog_datestamp != NULL)
{
- uschar *nowstamp = tod_stamp(tod_log_datestamp);
+ uschar *nowstamp = tod_stamp(string_datestamp_type);
if (Ustrncmp (rejectlog_datestamp, nowstamp, Ustrlen(nowstamp)) != 0)
{
(void)close(rejectlogfd); /* Close the file */
if (rejectlogfd < 0)
{
- open_log(&rejectlogfd, lt_reject); /* No return on error */
+ open_log(&rejectlogfd, lt_reject, NULL); /* No return on error */
if (fstat(rejectlogfd, &statbuf) >= 0) rejectlog_inode = statbuf.st_ino;
}
- if ((rc = write(rejectlogfd, log_buffer, length)) != length)
+ written_len = write_to_fd_buf(rejectlogfd, log_buffer, length);
+ if (written_len != length)
{
- log_write_failed(US"reject log", length, rc);
+ log_write_failed(US"reject log", length, written_len);
/* That function does not return */
}
}
}
-/* Handle the process log file, where exim processes can be made to dump
-details of what they are doing by sending them a USR1 signal. Note that
-a message id is not automatically added above. This information is always
-written to a file - never to syslog. */
-
-if ((flags & LOG_PROCESS) != 0)
- {
- int processlogfd;
- open_log(&processlogfd, lt_process); /* No return on error */
- if ((rc = write(processlogfd, log_buffer, length)) != length)
- {
- log_write_failed(US"process log", length, rc);
- /* That function does not return */
- }
- (void)close(processlogfd);
- }
-
-
/* Handle the panic log, which is not kept open like the others. If it fails to
open, there will be a recursive call to log_write(). We detect this above and
attempt to write to the system log as a last-ditch try at telling somebody. In
if ((logging_mode & LOG_MODE_FILE) != 0)
{
panic_recurseflag = TRUE;
- open_log(&paniclogfd, lt_panic); /* Won't return on failure */
+ open_log(&paniclogfd, lt_panic, NULL); /* Won't return on failure */
panic_recurseflag = FALSE;
if (panic_save_buffer != NULL)
- (void) write(paniclogfd, panic_save_buffer, Ustrlen(panic_save_buffer));
+ {
+ int i = write(paniclogfd, panic_save_buffer, Ustrlen(panic_save_buffer));
+ i = i; /* compiler quietening */
+ }
- if ((rc = write(paniclogfd, log_buffer, length)) != length)
+ written_len = write_to_fd_buf(paniclogfd, log_buffer, length);
+ if (written_len != length)
{
int save_errno = errno;
write_syslog(LOG_CRIT, log_buffer);
sprintf(CS log_buffer, "write failed on panic log: length=%d result=%d "
- "errno=%d (%s)", length, rc, save_errno, strerror(save_errno));
+ "errno=%d (%s)", length, (int)written_len, save_errno, strerror(save_errno));
write_syslog(LOG_CRIT, log_buffer);
flags |= LOG_PANIC_DIE;
}
syslog_open = FALSE;
}
+
+
+/*************************************************
+* Multi-bit set or clear *
+*************************************************/
+
+/* These functions take a list of bit indexes (terminated by -1) and
+clear or set the corresponding bits in the selector.
+
+Arguments:
+ selector address of the bit string
+ selsize number of words in the bit string
+ bits list of bits to set
+*/
+
+void
+bits_clear(unsigned int *selector, size_t selsize, int *bits)
+{
+for(; *bits != -1; ++bits)
+ BIT_CLEAR(selector, selsize, *bits);
+}
+
+void
+bits_set(unsigned int *selector, size_t selsize, int *bits)
+{
+for(; *bits != -1; ++bits)
+ BIT_SET(selector, selsize, *bits);
+}
+
+
+
+/*************************************************
+* Decode bit settings for log/debug *
+*************************************************/
+
+/* This function decodes a string containing bit settings in the form of +name
+and/or -name sequences, and sets/unsets bits in a bit string accordingly. It
+also recognizes a numeric setting of the form =<number>, but this is not
+intended for user use. It's an easy way for Exim to pass the debug settings
+when it is re-exec'ed.
+
+The option table is a list of names and bit indexes. The index -1
+means "set all bits, except for those listed in notall". The notall
+list is terminated by -1.
+
+The action taken for bad values varies depending upon why we're here.
+For log messages, or if the debugging is triggered from config, then we write
+to the log on the way out. For debug setting triggered from the command-line,
+we treat it as an unknown option: error message to stderr and die.
+
+Arguments:
+ selector address of the bit string
+ selsize number of words in the bit string
+ notall list of bits to exclude from "all"
+ string the configured string
+ options the table of option names
+ count size of table
+ which "log" or "debug"
+ flags DEBUG_FROM_CONFIG
+
+Returns: nothing on success - bomb out on failure
+*/
+
+void
+decode_bits(unsigned int *selector, size_t selsize, int *notall,
+ uschar *string, bit_table *options, int count, uschar *which, int flags)
+{
+uschar *errmsg;
+if (string == NULL) return;
+
+if (*string == '=')
+ {
+ char *end; /* Not uschar */
+ memset(selector, 0, sizeof(*selector)*selsize);
+ *selector = strtoul(CS string+1, &end, 0);
+ if (*end == 0) return;
+ errmsg = string_sprintf("malformed numeric %s_selector setting: %s", which,
+ string);
+ goto ERROR_RETURN;
+ }
+
+/* Handle symbolic setting */
+
+else for(;;)
+ {
+ BOOL adding;
+ uschar *s;
+ int len;
+ bit_table *start, *end;
+
+ while (isspace(*string)) string++;
+ if (*string == 0) return;
+
+ if (*string != '+' && *string != '-')
+ {
+ errmsg = string_sprintf("malformed %s_selector setting: "
+ "+ or - expected but found \"%s\"", which, string);
+ goto ERROR_RETURN;
+ }
+
+ adding = *string++ == '+';
+ s = string;
+ while (isalnum(*string) || *string == '_') string++;
+ len = string - s;
+
+ start = options;
+ end = options + count;
+
+ while (start < end)
+ {
+ bit_table *middle = start + (end - start)/2;
+ int c = Ustrncmp(s, middle->name, len);
+ if (c == 0)
+ {
+ if (middle->name[len] != 0) c = -1; else
+ {
+ unsigned int bit = middle->bit;
+
+ if (bit == -1)
+ {
+ if (adding)
+ {
+ memset(selector, -1, sizeof(*selector)*selsize);
+ bits_clear(selector, selsize, notall);
+ }
+ else
+ memset(selector, 0, sizeof(*selector)*selsize);
+ }
+ else if (adding)
+ BIT_SET(selector, selsize, bit);
+ else
+ BIT_CLEAR(selector, selsize, bit);
+
+ break; /* Out of loop to match selector name */
+ }
+ }
+ if (c < 0) end = middle; else start = middle + 1;
+ } /* Loop to match selector name */
+
+ if (start >= end)
+ {
+ errmsg = string_sprintf("unknown %s_selector setting: %c%.*s", which,
+ adding? '+' : '-', len, s);
+ goto ERROR_RETURN;
+ }
+ } /* Loop for selector names */
+
+/* Handle disasters */
+
+ERROR_RETURN:
+if (Ustrcmp(which, "debug") == 0)
+ {
+ if (flags & DEBUG_FROM_CONFIG)
+ {
+ log_write(0, LOG_CONFIG|LOG_PANIC, "%s", errmsg);
+ return;
+ }
+ fprintf(stderr, "exim: %s\n", errmsg);
+ exit(EXIT_FAILURE);
+ }
+else log_write(0, LOG_CONFIG|LOG_PANIC_DIE, "%s", errmsg);
+}
+
+
+
+/*************************************************
+* Activate a debug logfile (late) *
+*************************************************/
+
+/* Normally, debugging is activated from the command-line; it may be useful
+within the configuration to activate debugging later, based on certain
+conditions. If debugging is already in progress, we return early, no action
+taken (besides debug-logging that we wanted debug-logging).
+
+Failures in options are not fatal but will result in paniclog entries for the
+misconfiguration.
+
+The first use of this is in ACL logic, "control = debug/tag=foo/opts=+expand"
+which can be combined with conditions, etc, to activate extra logging only
+for certain sources. The second use is inetd wait mode debug preservation. */
+
+void
+debug_logging_activate(uschar *tag_name, uschar *opts)
+{
+int fd = -1;
+
+if (debug_file)
+ {
+ debug_printf("DEBUGGING ACTIVATED FROM WITHIN CONFIG.\n"
+ "DEBUG: Tag=\"%s\" opts=\"%s\"\n", tag_name, opts ? opts : US"");
+ return;
+ }
+
+if (tag_name != NULL && (Ustrchr(tag_name, '/') != NULL))
+ {
+ log_write(0, LOG_MAIN|LOG_PANIC, "debug tag may not contain a '/' in: %s",
+ tag_name);
+ return;
+ }
+
+debug_selector = D_default;
+if (opts)
+ decode_bits(&debug_selector, 1, debug_notall, opts,
+ debug_options, debug_options_count, US"debug", DEBUG_FROM_CONFIG);
+
+/* When activating from a transport process we may never have logged at all
+resulting in certain setup not having been done. Hack this for now so we
+do not segfault; note that nondefault log locations will not work */
+
+if (!*file_path) set_file_path();
+
+open_log(&fd, lt_debug, tag_name);
+
+if (fd != -1)
+ debug_file = fdopen(fd, "w");
+else
+ log_write(0, LOG_MAIN|LOG_PANIC, "unable to open debug log");
+}
+
+
+void
+debug_logging_stop(void)
+{
+if (!debug_file || !debuglog_name[0]) return;
+
+debug_selector = 0;
+fclose(debug_file);
+debug_file = NULL;
+unlink_log(lt_debug);
+}
+
+
/* End of log.c */
git://git.exim.org / exim.git / blobdiff