X-Git-Url: http://git.annexia.org/?p=libguestfs.git;a=blobdiff_plain;f=daemon%2Fproto.c;h=6fa243ffd624fdb3a48b750710fb67d49da71703;hp=d935ded587a12daf19c48d032f0ecd76c6e7ca97;hb=6280ac9b987c14f89749b4b4fdfec5a647567432;hpb=d1c35f871022e40f9abd93048c1115c6565f94cb diff --git a/daemon/proto.c b/daemon/proto.c index d935ded..6fa243f 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); + exit (EXIT_FAILURE); } buf = malloc (len); @@ -79,21 +86,22 @@ 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); + 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 (isprint (buf[j])) + if (c_isprint (buf[j])) printf ("%c", buf[j]); else printf ("."); @@ -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. */ @@ -176,12 +195,11 @@ reply_with_error (const char *fs, ...) } 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); @@ -215,30 +233,30 @@ 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.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 +280,7 @@ 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 +289,7 @@ 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 +299,16 @@ 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) == -1) { fprintf (stderr, "xwrite failed\n"); - exit (1); + exit (EXIT_FAILURE); } } @@ -306,10 +324,15 @@ 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) @@ -318,7 +341,7 @@ 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); + exit (EXIT_FAILURE); } buf = malloc (len); @@ -327,7 +350,8 @@ 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 +364,18 @@ 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 +386,16 @@ 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 +403,16 @@ 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); @@ -444,13 +474,11 @@ 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) { @@ -492,14 +520,14 @@ 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); int err = (xwrite (sock, lenbuf, 4) == 0 && xwrite (sock, buf, len) == 0 ? 0 : -1); if (err) { fprintf (stderr, "send_chunk: write failed\n"); - exit (1); + exit (EXIT_FAILURE); } return err;