X-Git-Url: http://git.annexia.org/?p=libguestfs.git;a=blobdiff_plain;f=daemon%2Fproto.c;h=628e86c1cbdde85aaa4982b4c834ac4dfba63431;hp=acd66017fd91493f397fa3310677d7fa82f19eef;hb=831b1fc1805e8450202b5c2cf9ab17a163ab0cc5;hpb=51d0620ad90f913cb749e641a839876b3ef755f8 diff --git a/daemon/proto.c b/daemon/proto.c index acd6601..628e86c 100644 --- a/daemon/proto.c +++ b/daemon/proto.c @@ -24,11 +24,18 @@ #include #include #include -#include #include /* defines MIN */ +#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" @@ -45,7 +52,7 @@ 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; @@ -53,24 +60,24 @@ main_loop (int _sock) 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); @@ -79,27 +86,28 @@ 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 @@ -112,7 +120,7 @@ main_loop (int _sock) 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. */ @@ -133,9 +141,20 @@ 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. */ @@ -147,11 +166,11 @@ main_loop (int _sock) end_us = (int64_t) end_t.tv_sec * 1000000 + end_t.tv_usec; elapsed_us = end_us - start_us; 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)); + 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: @@ -160,7 +179,7 @@ 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, ...) @@ -172,16 +191,15 @@ 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); @@ -189,11 +207,11 @@ 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]; @@ -215,30 +233,31 @@ 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); } } @@ -262,7 +281,7 @@ 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) { @@ -271,7 +290,7 @@ reply (xdrproc_t xdrp, char *ret) * we want to return an error message instead. (RHBZ#509597). */ if (!(*xdrp) (&xdr, ret)) { - reply_with_perror ("guestfsd: failed to encode reply body\n"); + 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; } @@ -281,16 +300,16 @@ 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); } } @@ -306,10 +325,15 @@ 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) @@ -317,8 +341,8 @@ 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); @@ -327,7 +351,8 @@ 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); @@ -340,15 +365,18 @@ 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 */ } @@ -359,13 +387,16 @@ 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; @@ -373,16 +404,16 @@ 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); @@ -397,7 +428,7 @@ 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; } @@ -444,25 +475,23 @@ 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; @@ -470,7 +499,7 @@ 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 @@ -492,11 +521,15 @@ 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 0; + return err; }