X-Git-Url: http://git.annexia.org/?p=libguestfs.git;a=blobdiff_plain;f=daemon%2Fproto.c;h=02ee6925fdd29b5410d5dd8e46dce315afc41bcb;hp=39cee5abe3765fc004a3ffb4b999116298cc9651;hb=e776a46ffcbede6d9b030dbc8f6ab32500b325ec;hpb=c127ad3d4a494abb2d9bb4fb6eaa179431d2411a diff --git a/daemon/proto.c b/daemon/proto.c index 39cee5a..02ee692 100644 --- a/daemon/proto.c +++ b/daemon/proto.c @@ -1,5 +1,5 @@ /* libguestfs - the guestfsd daemon - * Copyright (C) 2009 Red Hat Inc. + * Copyright (C) 2009 Red Hat Inc. * * 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 @@ -24,11 +24,19 @@ #include #include #include -#include #include /* defines MIN */ +#include +#include #include #include +#ifdef HAVE_WINDOWS_H +#include +#endif + +#include "c-ctype.h" +#include "ignore-value.h" + #include "daemon.h" #include "../src/guestfs_protocol.h" @@ -36,6 +44,15 @@ int proc_nr; int serial; +/* Time at which we received the current request. */ +static struct timeval start_t; + +/* Time at which the last progress notification was sent. */ +static struct timeval last_progress_t; + +/* Counts the number of progress notifications sent during this call. */ +static int count_progress; + /* The daemon communications socket. */ static int sock; @@ -45,32 +62,30 @@ main_loop (int _sock) XDR xdr; char *buf; char lenbuf[4]; - unsigned len; + uint32_t len; struct guestfs_message_header hdr; - struct timeval start_t, end_t; - int64_t start_us, end_us, elapsed_us; sock = _sock; for (;;) { -#if 0 /* Most common errors are leaked memory and leaked file descriptors, * so run this between each command: */ - if (verbose) - system ("ls -l /proc/self/fd"); -#endif + if (verbose && 0) + ignore_value (system ("ls -l /proc/self/fd")); /* Read the length word. */ - xread (sock, lenbuf, 4); + if (xread (sock, lenbuf, 4) == -1) + exit (EXIT_FAILURE); + xdrmem_create (&xdr, lenbuf, 4, XDR_DECODE); - xdr_uint32_t (&xdr, &len); + xdr_u_int (&xdr, &len); xdr_destroy (&xdr); if (len > GUESTFS_MESSAGE_MAX) { fprintf (stderr, "guestfsd: incoming message is too long (%u bytes)\n", - len); - exit (1); + len); + exit (EXIT_FAILURE); } buf = malloc (len); @@ -79,40 +94,41 @@ main_loop (int _sock) continue; } - xread (sock, buf, len); + if (xread (sock, buf, len) == -1) + exit (EXIT_FAILURE); -#if 0 +#ifdef ENABLE_PACKET_DUMP if (verbose) { - int i, j; + size_t i, j; for (i = 0; i < len; i += 16) { - printf ("%04x: ", i); - for (j = i; j < MIN (i+16, len); ++j) - printf ("%02x ", (unsigned char) buf[j]); - for (; j < i+16; ++j) - printf (" "); - printf ("|"); - for (j = i; j < MIN (i+16, len); ++j) - if (isprint (buf[j])) - printf ("%c", buf[j]); - else - printf ("."); - for (; j < i+16; ++j) - printf (" "); - printf ("|\n"); + printf ("%04zx: ", i); + for (j = i; j < MIN (i+16, len); ++j) + printf ("%02x ", (unsigned char) buf[j]); + for (; j < i+16; ++j) + printf (" "); + printf ("|"); + for (j = i; j < MIN (i+16, len); ++j) + if (c_isprint (buf[j])) + printf ("%c", buf[j]); + else + printf ("."); + for (; j < i+16; ++j) + printf (" "); + printf ("|\n"); } } #endif - /* In verbose mode, display the time taken to run each command. */ - if (verbose) - gettimeofday (&start_t, NULL); + gettimeofday (&start_t, NULL); + last_progress_t = start_t; + count_progress = 0; /* Decode the message header. */ xdrmem_create (&xdr, buf, len, XDR_DECODE); if (!xdr_guestfs_message_header (&xdr, &hdr)) { fprintf (stderr, "guestfsd: could not decode message header\n"); - exit (1); + exit (EXIT_FAILURE); } /* Check the version etc. */ @@ -133,23 +149,39 @@ main_loop (int _sock) goto cont; } - /* Now start to process this message. */ proc_nr = hdr.proc; serial = hdr.serial; + + /* Clear errors before we call the stub functions. This is just + * to ensure that we can accurately report errors in cases where + * error handling paths don't set errno correctly. + */ + errno = 0; +#ifdef WIN32 + SetLastError (0); + WSASetLastError (0); +#endif + + /* Now start to process this message. */ dispatch_incoming_message (&xdr); /* Note that dispatch_incoming_message will also send a reply. */ /* In verbose mode, display the time taken to run each command. */ if (verbose) { + struct timeval end_t; gettimeofday (&end_t, NULL); + int64_t start_us, end_us, elapsed_us; start_us = (int64_t) start_t.tv_sec * 1000000 + start_t.tv_usec; end_us = (int64_t) end_t.tv_sec * 1000000 + end_t.tv_usec; elapsed_us = end_us - start_us; - fprintf (stderr, "proc %d serial %d took %d.%02d seconds\n", - proc_nr, serial, - (int) (elapsed_us / 1000000), - (int) ((elapsed_us / 10000) % 100)); + + fprintf (stderr, "proc %d (%s) took %d.%02d seconds\n", + proc_nr, + proc_nr >= 0 && proc_nr < GUESTFS_PROC_NR_PROCS + ? function_names[proc_nr] : "UNKNOWN PROCEDURE", + (int) (elapsed_us / 1000000), + (int) ((elapsed_us / 10000) % 100)); } cont: @@ -158,7 +190,7 @@ main_loop (int _sock) } } -static void send_error (const char *msg); +static void send_error (int errnum, const char *msg); void reply_with_error (const char *fs, ...) @@ -170,16 +202,15 @@ reply_with_error (const char *fs, ...) vsnprintf (err, sizeof err, fs, args); va_end (args); - send_error (err); + send_error (0, err); } void -reply_with_perror (const char *fs, ...) +reply_with_perror_errno (int err, const char *fs, ...) { char buf1[GUESTFS_ERROR_LEN]; char buf2[GUESTFS_ERROR_LEN]; va_list args; - int err = errno; va_start (args, fs); vsnprintf (buf1, sizeof buf1, fs, args); @@ -187,11 +218,11 @@ reply_with_perror (const char *fs, ...) snprintf (buf2, sizeof buf2, "%s: %s", buf1, strerror (err)); - send_error (buf2); + send_error (err, buf2); } static void -send_error (const char *msg) +send_error (int errnum, const char *msg) { XDR xdr; char buf[GUESTFS_ERROR_LEN + 200]; @@ -213,30 +244,31 @@ send_error (const char *msg) if (!xdr_guestfs_message_header (&xdr, &hdr)) { fprintf (stderr, "guestfsd: failed to encode error message header\n"); - exit (1); + exit (EXIT_FAILURE); } + err.linux_errno = errnum; err.error_message = (char *) msg; if (!xdr_guestfs_message_error (&xdr, &err)) { fprintf (stderr, "guestfsd: failed to encode error message body\n"); - exit (1); + exit (EXIT_FAILURE); } len = xdr_getpos (&xdr); xdr_destroy (&xdr); xdrmem_create (&xdr, lenbuf, 4, XDR_ENCODE); - xdr_uint32_t (&xdr, &len); + xdr_u_int (&xdr, &len); xdr_destroy (&xdr); if (xwrite (sock, lenbuf, 4) == -1) { fprintf (stderr, "xwrite failed\n"); - exit (1); + exit (EXIT_FAILURE); } if (xwrite (sock, buf, len) == -1) { fprintf (stderr, "xwrite failed\n"); - exit (1); + exit (EXIT_FAILURE); } } @@ -260,13 +292,18 @@ reply (xdrproc_t xdrp, char *ret) if (!xdr_guestfs_message_header (&xdr, &hdr)) { fprintf (stderr, "guestfsd: failed to encode reply header\n"); - exit (1); + exit (EXIT_FAILURE); } if (xdrp) { + /* This can fail if the reply body is too large, for example + * if it exceeds the maximum message size. In that case + * we want to return an error message instead. (RHBZ#509597). + */ if (!(*xdrp) (&xdr, ret)) { - fprintf (stderr, "guestfsd: failed to encode reply body\n"); - exit (1); + reply_with_error ("guestfsd: failed to encode reply body\n(maybe the reply exceeds the maximum message size in the protocol?)"); + xdr_destroy (&xdr); + return; } } @@ -274,16 +311,16 @@ reply (xdrproc_t xdrp, char *ret) xdr_destroy (&xdr); xdrmem_create (&xdr, lenbuf, 4, XDR_ENCODE); - xdr_uint32_t (&xdr, &len); + xdr_u_int (&xdr, &len); xdr_destroy (&xdr); if (xwrite (sock, lenbuf, 4) == -1) { fprintf (stderr, "xwrite failed\n"); - exit (1); + exit (EXIT_FAILURE); } - if (xwrite (sock, buf, len) == len) { + if (xwrite (sock, buf, len) == -1) { fprintf (stderr, "xwrite failed\n"); - exit (1); + exit (EXIT_FAILURE); } } @@ -299,10 +336,15 @@ receive_file (receive_cb cb, void *opaque) uint32_t len; for (;;) { + if (verbose) + fprintf (stderr, "receive_file: reading length word\n"); + /* Read the length word. */ - xread (sock, lenbuf, 4); + if (xread (sock, lenbuf, 4) == -1) + exit (EXIT_FAILURE); + xdrmem_create (&xdr, lenbuf, 4, XDR_DECODE); - xdr_uint32_t (&xdr, &len); + xdr_u_int (&xdr, &len); xdr_destroy (&xdr); if (len == GUESTFS_CANCEL_FLAG) @@ -310,8 +352,8 @@ receive_file (receive_cb cb, void *opaque) if (len > GUESTFS_MESSAGE_MAX) { fprintf (stderr, "guestfsd: incoming message is too long (%u bytes)\n", - len); - exit (1); + len); + exit (EXIT_FAILURE); } buf = malloc (len); @@ -320,7 +362,8 @@ receive_file (receive_cb cb, void *opaque) return -1; } - xread (sock, buf, len); + if (xread (sock, buf, len) == -1) + exit (EXIT_FAILURE); xdrmem_create (&xdr, buf, len, XDR_DECODE); memset (&chunk, 0, sizeof chunk); @@ -333,15 +376,18 @@ receive_file (receive_cb cb, void *opaque) free (buf); if (verbose) - printf ("receive_file: got chunk: cancel = %d, len = %d, buf = %p\n", - chunk.cancel, chunk.data.data_len, chunk.data.data_val); + fprintf (stderr, "receive_file: got chunk: cancel = %d, len = %d, buf = %p\n", + chunk.cancel, chunk.data.data_len, chunk.data.data_val); if (chunk.cancel) { - fprintf (stderr, "receive_file: received cancellation from library\n"); + if (verbose) + fprintf (stderr, "receive_file: received cancellation from library\n"); xdr_free ((xdrproc_t) xdr_guestfs_chunk, (char *) &chunk); return -2; } if (chunk.data.data_len == 0) { + if (verbose) + fprintf (stderr, "receive_file: end of file, leaving function\n"); xdr_free ((xdrproc_t) xdr_guestfs_chunk, (char *) &chunk); return 0; /* end of file */ } @@ -352,13 +398,16 @@ receive_file (receive_cb cb, void *opaque) r = 0; xdr_free ((xdrproc_t) xdr_guestfs_chunk, (char *) &chunk); - if (r == -1) /* write error */ + if (r == -1) { /* write error */ + if (verbose) + fprintf (stderr, "receive_file: write error\n"); return -1; + } } } /* Send a cancellation flag back to the library. */ -void +int cancel_receive (void) { XDR xdr; @@ -366,16 +415,16 @@ cancel_receive (void) uint32_t flag = GUESTFS_CANCEL_FLAG; xdrmem_create (&xdr, fbuf, sizeof fbuf, XDR_ENCODE); - xdr_uint32_t (&xdr, &flag); + xdr_u_int (&xdr, &flag); xdr_destroy (&xdr); if (xwrite (sock, fbuf, sizeof fbuf) == -1) { perror ("write to socket"); - return; + return -1; } /* Keep receiving chunks and discarding, until library sees cancel. */ - (void) receive_file (NULL, NULL); + return receive_file (NULL, NULL); } static int check_for_library_cancellation (void); @@ -390,7 +439,7 @@ send_file_write (const void *buf, int len) if (len > GUESTFS_MAX_CHUNK_SIZE) { fprintf (stderr, "send_file_write: len (%d) > GUESTFS_MAX_CHUNK_SIZE (%d)\n", - len, GUESTFS_MAX_CHUNK_SIZE); + len, GUESTFS_MAX_CHUNK_SIZE); return -1; } @@ -437,25 +486,23 @@ check_for_library_cancellation (void) /* Read the message from the daemon. */ r = xread (sock, buf, sizeof buf); - if (r == -1) { - perror ("read"); + if (r == -1) return 0; - } xdrmem_create (&xdr, buf, sizeof buf, XDR_DECODE); - xdr_uint32_t (&xdr, &flag); + xdr_u_int (&xdr, &flag); xdr_destroy (&xdr); if (flag != GUESTFS_CANCEL_FLAG) { fprintf (stderr, "check_for_library_cancellation: read 0x%x from library, expected 0x%x\n", - flag, GUESTFS_CANCEL_FLAG); + flag, GUESTFS_CANCEL_FLAG); return 0; } return 1; } -void +int send_file_end (int cancel) { guestfs_chunk chunk; @@ -463,7 +510,7 @@ send_file_end (int cancel) chunk.cancel = cancel; chunk.data.data_len = 0; chunk.data.data_val = NULL; - send_chunk (&chunk); + return send_chunk (&chunk); } static int @@ -485,11 +532,90 @@ send_chunk (const guestfs_chunk *chunk) xdr_destroy (&xdr); xdrmem_create (&xdr, lenbuf, 4, XDR_ENCODE); - xdr_uint32_t (&xdr, &len); + xdr_u_int (&xdr, &len); xdr_destroy (&xdr); - (void) xwrite (sock, lenbuf, 4); - (void) xwrite (sock, buf, len); + int err = (xwrite (sock, lenbuf, 4) == 0 + && xwrite (sock, buf, len) == 0 ? 0 : -1); + if (err) { + fprintf (stderr, "send_chunk: write failed\n"); + exit (EXIT_FAILURE); + } + + return err; +} - return 0; +/* Initial delay before sending notification messages, and + * the period at which we send them thereafter. These times + * are in microseconds. + */ +#define NOTIFICATION_INITIAL_DELAY 2000000 +#define NOTIFICATION_PERIOD 333333 + +void +notify_progress (uint64_t position, uint64_t total) +{ + struct timeval now_t; + gettimeofday (&now_t, NULL); + + /* Always send a notification at 100%. This simplifies callers by + * allowing them to 'finish' the progress bar at 100% without + * needing special code. + */ + if (count_progress > 0 && position == total) + goto send; + + /* Calculate time in microseconds since the last progress message + * was sent out (or since the start of the call). + */ + int64_t last_us, now_us, elapsed_us; + last_us = + (int64_t) last_progress_t.tv_sec * 1000000 + last_progress_t.tv_usec; + now_us = (int64_t) now_t.tv_sec * 1000000 + now_t.tv_usec; + elapsed_us = now_us - last_us; + + /* Rate limit. */ + if ((count_progress == 0 && elapsed_us < NOTIFICATION_INITIAL_DELAY) || + (count_progress > 0 && elapsed_us < NOTIFICATION_PERIOD)) + return; + + send: + /* We're going to send a message now ... */ + count_progress++; + last_progress_t = now_t; + + /* Send the header word. */ + XDR xdr; + char buf[128]; + uint32_t i = GUESTFS_PROGRESS_FLAG; + size_t len; + xdrmem_create (&xdr, buf, 4, XDR_ENCODE); + xdr_u_int (&xdr, &i); + xdr_destroy (&xdr); + + if (xwrite (sock, buf, 4) == -1) { + fprintf (stderr, "xwrite failed\n"); + exit (EXIT_FAILURE); + } + + guestfs_progress message = { + .proc = proc_nr, + .serial = serial, + .position = position, + .total = total, + }; + + xdrmem_create (&xdr, buf, sizeof buf, XDR_ENCODE); + if (!xdr_guestfs_progress (&xdr, &message)) { + fprintf (stderr, "xdr_guestfs_progress: failed to encode message\n"); + xdr_destroy (&xdr); + return; + } + len = xdr_getpos (&xdr); + xdr_destroy (&xdr); + + if (xwrite (sock, buf, len) == -1) { + fprintf (stderr, "xwrite failed\n"); + exit (EXIT_FAILURE); + } }