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log.c

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/* -*- c-file-style: "linux"; -*-
   
   Copyright (C) 1998-2001 by Andrew Tridgell <tridge@samba.org>
   Copyright (C) 2000-2001 by Martin Pool <mbp@samba.org>
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

/*
  Logging and utility functions.
  tridge, May 1998

  Mapping to human-readable messages added by Martin Pool
  <mbp@samba.org>, Oct 2000.
  */
#include "rsync.h"

static char *logfname;
static FILE *logfile;
static int log_error_fd = -1;
struct stats stats;

int log_got_error=0;

struct {
        int code;
        char const *name;
} const rerr_names[] = {
        { RERR_SYNTAX     , "syntax or usage error" }, 
        { RERR_PROTOCOL   , "protocol incompatibility" }, 
        { RERR_FILESELECT , "errors selecting input/output files, dirs" }, 
        { RERR_UNSUPPORTED, "requested action not supported" }, 
        { RERR_STARTCLIENT, "error starting client-server protocol" }, 
        { RERR_SOCKETIO   , "error in socket IO" }, 
        { RERR_FILEIO     , "error in file IO" }, 
        { RERR_STREAMIO   , "error in rsync protocol data stream" }, 
        { RERR_MESSAGEIO  , "errors with program diagnostics" }, 
        { RERR_IPC        , "error in IPC code" }, 
        { RERR_SIGNAL     , "received SIGUSR1 or SIGINT" }, 
        { RERR_WAITCHILD  , "some error returned by waitpid()" }, 
        { RERR_MALLOC     , "error allocating core memory buffers" }, 
        { RERR_PARTIAL    , "some files could not be transferred" }, 
        { RERR_TIMEOUT    , "timeout in data send/receive" }, 
        { RERR_CMD_FAILED , "remote shell failed" },
        { RERR_CMD_KILLED , "remote shell killed" },
        { RERR_CMD_RUN,     "remote command could not be run" },
        { RERR_CMD_NOTFOUND, "remote command not found" },
        { 0, NULL }
};



/*
 * Map from rsync error code to name, or return NULL.
 */
static char const *rerr_name(int code)
{
        int i;
        for (i = 0; rerr_names[i].name; i++) {
                if (rerr_names[i].code == code)
                        return rerr_names[i].name;
        }
        return NULL;
}

struct err_list {
        struct err_list *next;
        char *buf;
        int len;
        int written; /* how many bytes we have written so far */
};

static struct err_list *err_list_head;
static struct err_list *err_list_tail;

/* add an error message to the pending error list */
static void err_list_add(int code, char *buf, int len)
{
        struct err_list *el;
        el = (struct err_list *)malloc(sizeof(*el));
        if (!el) exit_cleanup(RERR_MALLOC);
        el->next = NULL;
        el->buf = malloc(len+4);
        if (!el->buf) exit_cleanup(RERR_MALLOC);
        memcpy(el->buf+4, buf, len);
        SIVAL(el->buf, 0, ((code+MPLEX_BASE)<<24) | len);
        el->len = len+4;
        el->written = 0;
        if (err_list_tail) {
                err_list_tail->next = el;
        } else {
                err_list_head = el;
        }
        err_list_tail = el;
}


/* try to push errors off the error list onto the wire */
void err_list_push(void)
{
        if (log_error_fd == -1) return;

        while (err_list_head) {
                struct err_list *el = err_list_head;
                int n = write(log_error_fd, el->buf+el->written, el->len - el->written);
                /* don't check for an error if the best way of handling the error is
                   to ignore it */
                if (n == -1) break;
                if (n > 0) {
                        el->written += n;
                }
                if (el->written == el->len) {
                        free(el->buf);
                        err_list_head = el->next;
                        if (!err_list_head) err_list_tail = NULL;
                        free(el);
                }
        }
}


static void logit(int priority, char *buf)
{
        if (logfname) {
                if (!logfile)
                        log_open();
                fprintf(logfile,"%s [%d] %s", 
                        timestring(time(NULL)), (int)getpid(), buf);
                fflush(logfile);
        } else {
                syslog(priority, "%s", buf);
        }
}

void log_init(void)
{
        static int initialised;
        int options = LOG_PID;
        time_t t;

        if (initialised) return;
        initialised = 1;

        /* this looks pointless, but it is needed in order for the
           C library on some systems to fetch the timezone info
           before the chroot */
        t = time(NULL);
        localtime(&t);

        /* optionally use a log file instead of syslog */
        logfname = lp_log_file();
        if (logfname) {
                if (*logfname) {
                        log_open();
                        return;
                }
                logfname = NULL;
        }

#ifdef LOG_NDELAY
        options |= LOG_NDELAY;
#endif

#ifdef LOG_DAEMON
        openlog("rsyncd", options, lp_syslog_facility());
#else
        openlog("rsyncd", options);
#endif

#ifndef LOG_NDELAY
        logit(LOG_INFO,"rsyncd started\n");
#endif
}

void log_open()
{
        if (logfname && !logfile) {
                extern int orig_umask;
                int old_umask = umask(022 | orig_umask);
                logfile = fopen(logfname, "a");
                umask(old_umask);
        }
}

void log_close()
{
        if (logfile) {
                fclose(logfile);
                logfile = NULL;
        }
}

/* setup the error file descriptor - used when we are a server
   that is receiving files */
void set_error_fd(int fd)
{
        log_error_fd = fd;
        set_nonblocking(log_error_fd);
}

/* this is the underlying (unformatted) rsync debugging function. Call
   it with FINFO, FERROR or FLOG */
void rwrite(enum logcode code, char *buf, int len)
{
        FILE *f=NULL;
        extern int am_daemon;
        extern int am_server;
        extern int quiet;
        /* recursion can happen with certain fatal conditions */

        if (quiet && code == FINFO) return;

        if (len < 0) exit_cleanup(RERR_MESSAGEIO);

        buf[len] = 0;

        if (code == FLOG) {
                if (am_daemon) logit(LOG_INFO, buf);
                return;
        }

        /* first try to pass it off to our sibling */
        if (am_server && log_error_fd != -1) {
                err_list_add(code, buf, len);
                err_list_push();
                return;
        }

        /* If that fails, try to pass it to the other end.
         *
         * io_multiplex_write can fail if we do not have a multiplexed
         * connection at the moment, in which case we fall through and
         * log locally instead. */
        if (am_server && io_multiplex_write(code, buf, len)) {
                return;
        }

        if (am_daemon) {
                static int depth;
                int priority = LOG_INFO;
                if (code == FERROR) priority = LOG_WARNING;

                if (depth) return;

                depth++;

                log_init();
                logit(priority, buf);

                depth--;
                return;
        }

        if (code == FERROR) {
                log_got_error = 1;
                f = stderr;
        } 

        if (code == FINFO) {
                if (am_server) 
                        f = stderr;
                else
                        f = stdout;
        } 

        if (!f) exit_cleanup(RERR_MESSAGEIO);

        if (fwrite(buf, len, 1, f) != 1) exit_cleanup(RERR_MESSAGEIO);

        if (buf[len-1] == '\r' || buf[len-1] == '\n') fflush(f);
}
                

/* This is the rsync debugging function. Call it with FINFO, FERROR or
 * FLOG. */
void rprintf(enum logcode code, const char *format, ...)
{
        va_list ap;  
        char buf[1024];
        int len;

        va_start(ap, format);
        /* Note: might return -1 */
        len = vsnprintf(buf, sizeof(buf), format, ap);
        va_end(ap);

        /* Deal with buffer overruns.  Instead of panicking, just
         * truncate the resulting string.  Note that some vsnprintf()s
         * return -1 on truncation, e.g., glibc 2.0.6 and earlier. */
        if ((size_t) len > sizeof(buf)-1  ||  len < 0) {
                const char ellipsis[] = "[...]";

                /* Reset length, and zero-terminate the end of our buffer */
                len = sizeof(buf)-1;
                buf[len] = '\0';

                /* Copy the ellipsis to the end of the string, but give
                 * us one extra character:
                 *
                 *                  v--- null byte at buf[sizeof(buf)-1]
                 *        abcdefghij0
                 *     -> abcd[...]00  <-- now two null bytes at end
                 *
                 * If the input format string has a trailing newline,
                 * we copy it into that extra null; if it doesn't, well,
                 * all we lose is one byte.  */
                strncpy(buf+len-sizeof(ellipsis), ellipsis, sizeof(ellipsis));
                if (format[strlen(format)-1] == '\n') {
                        buf[len-1] = '\n';
                }
        }

        rwrite(code, buf, len);
}


/* This is like rprintf, but it also tries to print some
 * representation of the error code.  Normally errcode = errno.
 *
 * Unlike rprintf, this always adds a newline and there should not be
 * one in the format string.
 *
 * Note that since strerror might involve dynamically loading a
 * message catalog we need to call it once before chroot-ing. */
void rsyserr(enum logcode code, int errcode, const char *format, ...)
{
        va_list ap;  
        char buf[1024];
        int len;
        size_t sys_len;
        char *sysmsg;

        va_start(ap, format);
        /* Note: might return <0 */
        len = vsnprintf(buf, sizeof(buf), format, ap);
        va_end(ap);

        /* TODO: Put in RSYNC_NAME at the start. */

        if ((size_t) len > sizeof(buf)-1)
                exit_cleanup(RERR_MESSAGEIO);

        sysmsg = strerror(errcode);
        sys_len = strlen(sysmsg);
        if ((size_t) len + 3 + sys_len > sizeof(buf) - 1)
                exit_cleanup(RERR_MESSAGEIO);

        strcpy(buf + len, ": ");
        len += 2;
        strcpy(buf + len, sysmsg);
        len += sys_len;
        strcpy(buf + len, "\n");
        len++;

        rwrite(code, buf, len);
}



void rflush(enum logcode code)
{
        FILE *f = NULL;
        extern int am_daemon;
        
        if (am_daemon) {
                return;
        }

        if (code == FLOG) {
                return;
        } 

        if (code == FERROR) {
                f = stderr;
        } 

        if (code == FINFO) {
                extern int am_server;
                if (am_server) 
                        f = stderr;
                else
                        f = stdout;
        } 

        if (!f) exit_cleanup(RERR_MESSAGEIO);
        fflush(f);
}



/* a generic logging routine for send/recv, with parameter
   substitiution */
static void log_formatted(enum logcode code,
                          char *format, char *op, struct file_struct *file,
                          struct stats *initial_stats)
{
        extern int module_id;
        extern char *auth_user;
        char buf[1024];
        char buf2[1024];
        char *p, *s, *n;
        size_t l;
        extern struct stats stats;              
        extern int am_sender;
        extern int am_daemon;
        int64 b;

        /* We expand % codes one by one in place in buf.  We don't
         * copy in the terminating nul of the inserted strings, but
         * rather keep going until we reach the nul of the format.
         * Just to make sure we don't clobber that nul and therefore
         * accidentally keep going, we zero the buffer now. */
        memset(buf, 0, sizeof buf);
        strlcpy(buf, format, sizeof(buf));
        
        for (s=&buf[0]; 
             s && (p=strchr(s,'%')); ) {
                n = NULL;
                s = p + 1;

                switch (p[1]) {
                case 'h': if (am_daemon) n = client_name(0); break;
                case 'a': if (am_daemon) n = client_addr(0); break;
                case 'l': 
                        snprintf(buf2,sizeof(buf2),"%.0f", 
                                 (double)file->length); 
                        n = buf2;
                        break;
                case 'p': 
                        snprintf(buf2,sizeof(buf2),"%d", 
                                 (int)getpid()); 
                        n = buf2;
                        break;
                case 'o': n = op; break;
                case 'f': 
                        snprintf(buf2, sizeof(buf2), "%s/%s", 
                                 file->basedir?file->basedir:"", 
                                 f_name(file));
                        clean_fname(buf2);
                        n = buf2; 
                        if (*n == '/') n++;
                        break;
                case 'm': n = lp_name(module_id); break;
                case 't': n = timestring(time(NULL)); break;
                case 'P': n = lp_path(module_id); break;
                case 'u': n = auth_user; break;
                case 'b': 
                        if (am_sender) {
                                b = stats.total_written - 
                                        initial_stats->total_written;
                        } else {
                                b = stats.total_read - 
                                        initial_stats->total_read;
                        }
                        snprintf(buf2,sizeof(buf2),"%.0f", (double)b); 
                        n = buf2;
                        break;
                case 'c': 
                        if (!am_sender) {
                                b = stats.total_written - 
                                        initial_stats->total_written;
                        } else {
                                b = stats.total_read - 
                                        initial_stats->total_read;
                        }
                        snprintf(buf2,sizeof(buf2),"%.0f", (double)b); 
                        n = buf2;
                        break;
                }

                /* n is the string to be inserted in place of this %
                 * code; l is its length not including the trailing
                 * NUL */
                if (!n)
                        continue;

                l = strlen(n);

                if (l + ((int)(s - &buf[0])) >= sizeof(buf)) {
                        rprintf(FERROR,"buffer overflow expanding %%%c - exiting\n",
                                p[0]);
                        exit_cleanup(RERR_MESSAGEIO);
                }

                /* Shuffle the rest of the string along to make space for n */
                if (l != 2) {
                        memmove(s+(l-1), s+1, strlen(s+1)+1);
                }

                /* Copy in n but NOT its nul, because the format sting
                 * probably continues after this. */
                memcpy(p, n, l);

                /* Skip over inserted string; continue looking */
                s = p+l;
        }

        rprintf(code,"%s\n", buf);
}

/* log the outgoing transfer of a file */
void log_send(struct file_struct *file, struct stats *initial_stats)
{
        extern int module_id;
        extern int am_server;
        extern char *log_format;

        if (lp_transfer_logging(module_id)) {
                log_formatted(FLOG, lp_log_format(module_id), "send", file, initial_stats);
        } else if (log_format && !am_server) {
                log_formatted(FINFO, log_format, "send", file, initial_stats);
        }
}

/* log the incoming transfer of a file */
void log_recv(struct file_struct *file, struct stats *initial_stats)
{
        extern int module_id;
        extern int am_server;
        extern char *log_format;

        if (lp_transfer_logging(module_id)) {
                log_formatted(FLOG, lp_log_format(module_id), "recv", file, initial_stats);
        } else if (log_format && !am_server) {
                log_formatted(FINFO, log_format, "recv", file, initial_stats);
        }
}




/*
 * Called when the transfer is interrupted for some reason.
 *
 * Code is one of the RERR_* codes from errcode.h, or terminating
 * successfully.
 */
void log_exit(int code, const char *file, int line)
{
        if (code == 0) {
                extern struct stats stats;              
                rprintf(FLOG,"wrote %.0f bytes  read %.0f bytes  total size %.0f\n",
                        (double)stats.total_written,
                        (double)stats.total_read,
                        (double)stats.total_size);
        } else {
                const char *name;

                name = rerr_name(code);
                if (!name)
                        name = "unexplained error";
                
                rprintf(FERROR,"rsync error: %s (code %d) at %s(%d)\n", 
                        name, code, file, line);
        }
}

/*
 * Log the incoming transfer of a file for interactive use,
 * this will be called at the end where the client was run.
 * Called when a file starts to be transferred.
 */
void log_transfer(struct file_struct *file, const char *fname)
{
        extern int verbose;

        if (!verbose) return;

        rprintf(FINFO, "%s\n", fname);
}

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