X-Git-Url: http://git.annexia.org/?p=libguestfs.git;a=blobdiff_plain;f=daemon%2Fguestfsd.c;h=e398b7d8348410fad052a94ebe27bde014e4b0a9;hp=9d110d732031e7483a0b40d812a890ec4a4ecedb;hb=428a45c3e15f03e9861e1b551e1ae8da821dba5f;hpb=843514eef9dc6d04d71e031ba9ddb16e2beb9a04 diff --git a/daemon/guestfsd.c b/daemon/guestfsd.c index 9d110d7..e398b7d 100644 --- a/daemon/guestfsd.c +++ b/daemon/guestfsd.c @@ -1,5 +1,5 @@ /* libguestfs - the guestfsd daemon - * Copyright (C) 2009 Red Hat Inc. + * Copyright (C) 2009-2010 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 @@ -20,6 +20,10 @@ #define _BSD_SOURCE /* for daemon(3) */ +#ifdef HAVE_WINDOWS_H +# include +#endif + #include #include #include @@ -27,43 +31,136 @@ #include #include #include -#include #include -#include #include +#include +#include +#include +#include +#include #include +#include +#include +#include + +#ifdef HAVE_PRINTF_H +# include +#endif + +#include "sockets.h" +#include "c-ctype.h" +#include "ignore-value.h" +#include "error.h" #include "daemon.h" -static void usage (void); +static char *read_cmdline (void); + +#ifndef MAX +# define MAX(a,b) ((a)>(b)?(a):(b)) +#endif + +/* Not the end of the world if this open flag is not defined. */ +#ifndef O_CLOEXEC +# define O_CLOEXEC 0 +#endif + +/* If root device is an ext2 filesystem, this is the major and minor. + * This is so we can ignore this device from the point of view of the + * user, eg. in guestfs_list_devices and many other places. + */ +static dev_t root_device = 0; + +int verbose = 0; + +static int print_shell_quote (FILE *stream, const struct printf_info *info, const void *const *args); +static int print_sysroot_shell_quote (FILE *stream, const struct printf_info *info, const void *const *args); +#ifdef HAVE_REGISTER_PRINTF_SPECIFIER +static int print_arginfo (const struct printf_info *info, size_t n, int *argtypes, int *size); +#else +#ifdef HAVE_REGISTER_PRINTF_FUNCTION +static int print_arginfo (const struct printf_info *info, size_t n, int *argtypes); +#else +#error "HAVE_REGISTER_PRINTF_{SPECIFIER|FUNCTION} not defined" +#endif +#endif + +#ifdef WIN32 +static int +daemon (int nochdir, int noclose) +{ + fprintf (stderr, + "On Windows the daemon does not support forking into the " + "background.\nYou *must* run the daemon with the -f option.\n"); + exit (EXIT_FAILURE); +} +#endif /* WIN32 */ + +#ifdef WIN32 +static int +winsock_init (void) +{ + int r; + + /* http://msdn2.microsoft.com/en-us/library/ms742213.aspx */ + r = gl_sockets_startup (SOCKETS_2_2); + return r == 0 ? 0 : -1; +} +#else /* !WIN32 */ +static int +winsock_init (void) +{ + return 0; +} +#endif /* !WIN32 */ + +/* Location to mount root device. */ +const char *sysroot = "/sysroot"; /* No trailing slash. */ +int sysroot_len = 8; -/* Also in guestfs.c */ -#define VMCHANNEL_PORT "6666" -#define VMCHANNEL_ADDR "10.0.2.4" +/* Not used explicitly, but required by the gnulib 'error' module. */ +const char *program_name = "guestfsd"; + +static void +usage (void) +{ + fprintf (stderr, + "guestfsd [-f|--foreground] [-v|--verbose]\n"); +} int main (int argc, char *argv[]) { - static const char *options = "fh:p:?"; - static struct option long_options[] = { + static const char *options = "fv?"; + static const struct option long_options[] = { { "foreground", 0, 0, 'f' }, { "help", 0, 0, '?' }, - { "host", 1, 0, 'h' }, - { "port", 1, 0, 'p' }, + { "verbose", 0, 0, 'v' }, { 0, 0, 0, 0 } }; - int c, n, r; + int c; int dont_fork = 0; - const char *host = NULL; - const char *port = NULL; - FILE *fp; - char buf[4096]; - char *p, *p2; - int sock; - struct addrinfo *res, *rr; - struct addrinfo hints; - XDR xdr; - unsigned len; + char *cmdline; + + if (winsock_init () == -1) + error (EXIT_FAILURE, 0, "winsock initialization failed"); + +#ifdef HAVE_REGISTER_PRINTF_SPECIFIER + /* http://udrepper.livejournal.com/20948.html */ + register_printf_specifier ('Q', print_shell_quote, print_arginfo); + register_printf_specifier ('R', print_sysroot_shell_quote, print_arginfo); +#else +#ifdef HAVE_REGISTER_PRINTF_FUNCTION + register_printf_function ('Q', print_shell_quote, print_arginfo); + register_printf_function ('R', print_sysroot_shell_quote, print_arginfo); +#else +#error "HAVE_REGISTER_PRINTF_{SPECIFIER|FUNCTION} not defined" +#endif +#endif + + struct stat statbuf; + if (stat ("/", &statbuf) == 0) + root_device = statbuf.st_dev; for (;;) { c = getopt_long (argc, argv, options, long_options, NULL); @@ -74,103 +171,107 @@ main (int argc, char *argv[]) dont_fork = 1; break; - case 'h': - host = optarg; - break; - - case 'p': - port = optarg; + case 'v': + verbose = 1; break; case '?': usage (); - exit (0); + exit (EXIT_SUCCESS); default: fprintf (stderr, "guestfsd: unexpected command line option 0x%x\n", c); - exit (1); + exit (EXIT_FAILURE); } } if (optind < argc) { usage (); - exit (1); + exit (EXIT_FAILURE); } - /* If host and port aren't set yet, try /proc/cmdline. */ - if (!host || !port) { - fp = fopen ("/proc/cmdline", "r"); - if (fp == NULL) { - perror ("/proc/cmdline"); - goto next; - } - n = fread (buf, 1, sizeof buf - 1, fp); - fclose (fp); - buf[n] = '\0'; - - p = strstr (buf, "guestfs="); - - if (p) { - p += 8; - p2 = strchr (p, ':'); - if (p2) { - *p2++ = '\0'; - host = p; - r = strcspn (p2, " \n"); - p2[r] = '\0'; - port = p2; - } - } - } + cmdline = read_cmdline (); - next: - /* Can't parse /proc/cmdline, so use built-in defaults. */ - if (!host || !port) { - host = VMCHANNEL_ADDR; - port = VMCHANNEL_PORT; - } + /* Set the verbose flag. */ + verbose = verbose || + (cmdline && strstr (cmdline, "guestfs_verbose=1") != NULL); + if (verbose) + printf ("verbose daemon enabled\n"); - /* Resolve the hostname. */ - memset (&hints, 0, sizeof hints); - hints.ai_socktype = SOCK_STREAM; - hints.ai_flags = AI_ADDRCONFIG; - r = getaddrinfo (host, port, &hints, &res); - if (r != 0) { - fprintf (stderr, "%s:%s: %s\n", host, port, gai_strerror (r)); - exit (1); + if (verbose) { + if (cmdline) + printf ("linux commmand line: %s\n", cmdline); + else + printf ("could not read linux command line\n"); } - /* Connect to the given TCP socket. */ - sock = -1; - for (rr = res; rr != NULL; rr = rr->ai_next) { - sock = socket (rr->ai_family, rr->ai_socktype, rr->ai_protocol); - if (sock != -1) { - if (connect (sock, rr->ai_addr, rr->ai_addrlen) == 0) - break; - perror ("connect"); +#ifndef WIN32 + /* Make sure SIGPIPE doesn't kill us. */ + struct sigaction sa; + memset (&sa, 0, sizeof sa); + sa.sa_handler = SIG_IGN; + sa.sa_flags = 0; + if (sigaction (SIGPIPE, &sa, NULL) == -1) + perror ("sigaction SIGPIPE"); /* but try to continue anyway ... */ +#endif - close (sock); - sock = -1; - } - } - freeaddrinfo (res); +#ifdef WIN32 +# define setenv(n,v,f) _putenv(n "=" v) +#endif + /* Set up a basic environment. After we are called by /init the + * environment is essentially empty. + * https://bugzilla.redhat.com/show_bug.cgi?id=502074#c5 + * + * NOTE: if you change $PATH, you must also change 'prog_exists' + * function below. + */ + setenv ("PATH", "/sbin:/usr/sbin:/bin:/usr/bin", 1); + setenv ("SHELL", "/bin/sh", 1); + setenv ("LC_ALL", "C", 1); + setenv ("TERM", "dumb", 1); + +#ifndef WIN32 + /* We document that umask defaults to 022 (it should be this anyway). */ + umask (022); +#else + /* This is the default for Windows anyway. It's not even clear if + * Windows ever uses this -- the MSDN documentation for the function + * contains obvious errors. + */ + _umask (0); +#endif + /* Connect to virtio-serial channel. */ + int sock = open ("/dev/virtio-ports/org.libguestfs.channel.0", + O_RDWR | O_CLOEXEC); if (sock == -1) { - fprintf (stderr, "connection to %s:%s failed\n", host, port); - exit (1); + fprintf (stderr, + "\n" + "Failed to connect to virtio-serial channel.\n" + "\n" + "This is a fatal error and the appliance will now exit.\n" + "\n" + "Usually this error is caused by either QEMU or the appliance\n" + "kernel not supporting the vmchannel method that the\n" + "libguestfs library chose to use. Please run\n" + "'libguestfs-test-tool' and provide the complete, unedited\n" + "output to the libguestfs developers, either in a bug report\n" + "or on the libguestfs redhat com mailing list.\n" + "\n"); + exit (EXIT_FAILURE); } /* Send the magic length message which indicates that * userspace is up inside the guest. */ - len = 0xf5f55ff5; - xdrmem_create (&xdr, buf, sizeof buf, XDR_ENCODE); - if (!xdr_uint32_t (&xdr, &len)) { - fprintf (stderr, "xdr_uint32_t failed\n"); - exit (1); - } + char lenbuf[4]; + XDR xdr; + uint32_t len = GUESTFS_LAUNCH_FLAG; + xdrmem_create (&xdr, lenbuf, sizeof lenbuf, XDR_ENCODE); + xdr_u_int (&xdr, &len); - xwrite (sock, buf, xdr_getpos (&xdr)); + if (xwrite (sock, lenbuf, sizeof lenbuf) == -1) + exit (EXIT_FAILURE); xdr_destroy (&xdr); @@ -178,68 +279,207 @@ main (int argc, char *argv[]) if (!dont_fork) { if (daemon (0, 1) == -1) { perror ("daemon"); - exit (1); + exit (EXIT_FAILURE); } } /* Enter the main loop, reading and performing actions. */ main_loop (sock); - exit (0); + exit (EXIT_SUCCESS); } -void -xwrite (int sock, const void *buf, size_t len) +/* Read /proc/cmdline. */ +static char * +read_cmdline (void) +{ + int fd = open ("/proc/cmdline", O_RDONLY); + if (fd == -1) { + perror ("/proc/cmdline"); + return NULL; + } + + size_t len = 0; + ssize_t n; + char buf[256]; + char *r = NULL; + + for (;;) { + n = read (fd, buf, sizeof buf); + if (n == -1) { + perror ("read"); + free (r); + close (fd); + return NULL; + } + if (n == 0) + break; + char *newr = realloc (r, len + n + 1); /* + 1 is for terminating NUL */ + if (newr == NULL) { + perror ("realloc"); + free (r); + close (fd); + return NULL; + } + r = newr; + memcpy (&r[len], buf, n); + len += n; + } + + if (r) + r[len] = '\0'; + + if (close (fd) == -1) { + perror ("close"); + free (r); + return NULL; + } + + return r; +} + +/* Return true iff device is the root device (and therefore should be + * ignored from the point of view of user calls). + */ +int +is_root_device (const char *device) +{ + struct stat statbuf; + if (stat (device, &statbuf) == -1) { + perror (device); + return 0; + } + if (statbuf.st_rdev == root_device) + return 1; + return 0; +} + +/* Turn "/path" into "/sysroot/path". + * + * Caller must check for NULL and call reply_with_perror ("malloc") + * if it is. Caller must also free the string. + * + * See also the custom %R printf formatter which does shell quoting too. + */ +char * +sysroot_path (const char *path) +{ + char *r; + int len = strlen (path) + sysroot_len + 1; + + r = malloc (len); + if (r == NULL) + return NULL; + + snprintf (r, len, "%s%s", sysroot, path); + return r; +} + +int +xwrite (int sock, const void *v_buf, size_t len) { int r; + const char *buf = v_buf; while (len > 0) { r = write (sock, buf, len); if (r == -1) { perror ("write"); - exit (1); + return -1; } buf += r; len -= r; } + + return 0; } -void -xread (int sock, void *buf, size_t len) +int +xread (int sock, void *v_buf, size_t len) { int r; + char *buf = v_buf; while (len > 0) { r = read (sock, buf, len); if (r == -1) { perror ("read"); - exit (1); + return -1; } if (r == 0) { - fprintf (stderr, "read: unexpected end of file on comms socket\n"); - exit (1); + fprintf (stderr, "read: unexpected end of file on fd %d\n", sock); + return -1; } buf += r; len -= r; } + + return 0; } -static void -usage (void) +int +add_string (char ***argv, int *size, int *alloc, const char *str) { - fprintf (stderr, "guestfsd [-f] [-h host -p port]\n"); + char **new_argv; + char *new_str; + + if (*size >= *alloc) { + *alloc += 64; + new_argv = realloc (*argv, *alloc * sizeof (char *)); + if (new_argv == NULL) { + reply_with_perror ("realloc"); + free_strings (*argv); + return -1; + } + *argv = new_argv; + } + + if (str) { + new_str = strdup (str); + if (new_str == NULL) { + reply_with_perror ("strdup"); + free_strings (*argv); + } + } else + new_str = NULL; + + (*argv)[*size] = new_str; + + (*size)++; + return 0; } -int -count_strings (char **argv) +size_t +count_strings (char *const *argv) { - int argc; + size_t argc; for (argc = 0; argv[argc] != NULL; ++argc) ; return argc; } +/* http://graphics.stanford.edu/~seander/bithacks.html#DetermineIfPowerOf2 */ +int +is_power_of_2 (unsigned long v) +{ + return v && ((v & (v - 1)) == 0); +} + +static int +compare (const void *vp1, const void *vp2) +{ + char * const *p1 = (char * const *) vp1; + char * const *p2 = (char * const *) vp2; + return strcmp (*p1, *p2); +} + +void +sort_strings (char **argv, int len) +{ + qsort (argv, len, sizeof (char *), compare); +} + void free_strings (char **argv) { @@ -250,65 +490,281 @@ free_strings (char **argv) free (argv); } +void +free_stringslen (char **argv, int len) +{ + int i; + + for (i = 0; i < len; ++i) + free (argv[i]); + free (argv); +} + +/* Easy ways to run external commands. For full documentation, see + * 'commandrvf' below. + */ +int +commandf (char **stdoutput, char **stderror, int flags, const char *name, ...) +{ + va_list args; + const char **argv; + char *s; + int i, r; + + /* Collect the command line arguments into an array. */ + i = 2; + argv = malloc (sizeof (char *) * i); + if (argv == NULL) { + perror ("malloc"); + return -1; + } + argv[0] = (char *) name; + argv[1] = NULL; + + va_start (args, name); + + while ((s = va_arg (args, char *)) != NULL) { + const char **p = realloc (argv, sizeof (char *) * (++i)); + if (p == NULL) { + perror ("realloc"); + free (argv); + va_end (args); + return -1; + } + argv = p; + argv[i-2] = s; + argv[i-1] = NULL; + } + + va_end (args); + + r = commandvf (stdoutput, stderror, flags, (const char * const*) argv); + + /* NB: Mustn't free the strings which are on the stack. */ + free (argv); + + return r; +} + +/* Same as 'command', but we allow the status code from the + * subcommand to be non-zero, and return that status code. + * We still return -1 if there was some other error. + */ +int +commandrf (char **stdoutput, char **stderror, int flags, const char *name, ...) +{ + va_list args; + const char **argv; + char *s; + int i, r; + + /* Collect the command line arguments into an array. */ + i = 2; + argv = malloc (sizeof (char *) * i); + if (argv == NULL) { + perror ("malloc"); + return -1; + } + argv[0] = (char *) name; + argv[1] = NULL; + + va_start (args, name); + + while ((s = va_arg (args, char *)) != NULL) { + const char **p = realloc (argv, sizeof (char *) * (++i)); + if (p == NULL) { + perror ("realloc"); + free (argv); + va_end (args); + return -1; + } + argv = p; + argv[i-2] = s; + argv[i-1] = NULL; + } + + va_end (args); + + r = commandrvf (stdoutput, stderror, flags, argv); + + /* NB: Mustn't free the strings which are on the stack. */ + free (argv); + + return r; +} + +/* Same as 'command', but passing an argv. */ +int +commandvf (char **stdoutput, char **stderror, int flags, + char const *const *argv) +{ + int r; + + r = commandrvf (stdoutput, stderror, flags, (void *) argv); + if (r == 0) + return 0; + else + return -1; +} + /* This is a more sane version of 'system(3)' for running external * commands. It uses fork/execvp, so we don't need to worry about * quoting of parameters, and it allows us to capture any error * messages in a buffer. + * + * If stdoutput is not NULL, then *stdoutput will return the stdout + * of the command. + * + * If stderror is not NULL, then *stderror will return the stderr + * of the command. If there is a final \n character, it is removed + * so you can use the error string directly in a call to + * reply_with_error. + * + * Flags: + * + * COMMAND_FLAG_FOLD_STDOUT_ON_STDERR: For broken external commands + * that send error messages to stdout (hello, parted) but that don't + * have any useful stdout information, use this flag to capture the + * error messages in the *stderror buffer. If using this flag, + * you should pass stdoutput as NULL because nothing could ever be + * captured in that buffer. + * + * COMMAND_FLAG_CHROOT_COPY_FILE_TO_STDIN: For running external + * commands on chrooted files correctly (see RHBZ#579608) specifying + * this flag causes another process to be forked which chroots into + * sysroot and just copies the input file to stdin of the specified + * command. The file descriptor is ORed with the flags, and that file + * descriptor is always closed by this function. See hexdump.c for an + * example of usage. */ int -command (char **stdoutput, char **stderror, const char *name, ...) +commandrvf (char **stdoutput, char **stderror, int flags, + char const* const *argv) { int so_size = 0, se_size = 0; int so_fd[2], se_fd[2]; - int pid, r, quit; + int flag_copy_stdin = flags & COMMAND_FLAG_CHROOT_COPY_FILE_TO_STDIN; + int stdin_fd[2] = { -1, -1 }; + pid_t pid, stdin_pid = -1; + int r, quit, i; fd_set rset, rset2; char buf[256]; + char *p; if (stdoutput) *stdoutput = NULL; if (stderror) *stderror = NULL; + if (verbose) { + printf ("%s", argv[0]); + for (i = 1; argv[i] != NULL; ++i) + printf (" %s", argv[i]); + printf ("\n"); + } + + /* Note: abort is used in a few places along the error paths early + * in this function. This is because (a) cleaning up correctly is + * very complex at these places and (b) abort is used when a + * resource problems is indicated which would be due to much more + * serious issues - eg. memory or file descriptor leaks. We + * wouldn't expect fork(2) or pipe(2) to fail in normal + * circumstances. + */ + if (pipe (so_fd) == -1 || pipe (se_fd) == -1) { - perror ("pipe"); - return -1; + error (0, errno, "pipe"); + abort (); + } + + if (flag_copy_stdin) { + if (pipe (stdin_fd) == -1) { + error (0, errno, "pipe"); + abort (); + } } pid = fork (); if (pid == -1) { - perror ("fork"); - return -1; + error (0, errno, "fork"); + abort (); } - if (pid == 0) { /* Child process. */ - va_list args; - char **argv; - char *s; - int i; - - /* Collect the command line arguments into an array. */ - va_start (args, name); - - i = 2; - argv = malloc (sizeof (char *) * i); - argv[0] = (char *) name; - argv[1] = NULL; - - while ((s = va_arg (args, char *)) != NULL) { - argv = realloc (argv, sizeof (char *) * (++i)); - argv[i-2] = s; - argv[i-1] = NULL; - } - + if (pid == 0) { /* Child process running the command. */ close (0); + if (flag_copy_stdin) { + dup2 (stdin_fd[0], 0); + close (stdin_fd[0]); + close (stdin_fd[1]); + } else { + /* Set stdin to /dev/null (ignore failure) */ + open ("/dev/null", O_RDONLY); + } close (so_fd[0]); close (se_fd[0]); - dup2 (so_fd[1], 1); + if (!(flags & COMMAND_FLAG_FOLD_STDOUT_ON_STDERR)) + dup2 (so_fd[1], 1); + else + dup2 (se_fd[1], 1); dup2 (se_fd[1], 2); close (so_fd[1]); close (se_fd[1]); - execvp (name, argv); - perror (name); - _exit (1); + execvp (argv[0], (void *) argv); + perror (argv[0]); + _exit (EXIT_FAILURE); + } + + if (flag_copy_stdin) { + int fd = flags & COMMAND_FLAG_FD_MASK; + + stdin_pid = fork (); + if (stdin_pid == -1) { + error (0, errno, "fork"); + abort (); + } + + if (stdin_pid == 0) { /* Child process copying stdin. */ + close (so_fd[0]); + close (so_fd[1]); + close (se_fd[0]); + close (se_fd[1]); + + close (1); + dup2 (stdin_fd[1], 1); + close (stdin_fd[0]); + close (stdin_fd[1]); + + if (chroot (sysroot) == -1) { + perror ("chroot"); + _exit (EXIT_FAILURE); + } + + ssize_t n; + char buffer[BUFSIZ]; + while ((n = read (fd, buffer, sizeof buffer)) > 0) { + if (xwrite (1, buffer, n) == -1) + /* EPIPE error indicates the command process has exited + * early. If the command process fails that will be caught + * by the daemon, and if not, then it's not an error. + */ + _exit (errno == EPIPE ? EXIT_SUCCESS : EXIT_FAILURE); + } + + if (n == -1) { + perror ("read"); + _exit (EXIT_FAILURE); + } + + if (close (fd) == -1) { + perror ("close"); + _exit (EXIT_FAILURE); + } + + _exit (EXIT_SUCCESS); + } + + close (fd); + close (stdin_fd[0]); + close (stdin_fd[1]); } /* Parent process. */ @@ -320,90 +776,339 @@ command (char **stdoutput, char **stderror, const char *name, ...) FD_SET (se_fd[0], &rset); quit = 0; - while (!quit) { + while (quit < 2) { rset2 = rset; r = select (MAX (so_fd[0], se_fd[0]) + 1, &rset2, NULL, NULL, NULL); if (r == -1) { perror ("select"); + quit: + if (stdoutput) free (*stdoutput); + if (stderror) free (*stderror); + close (so_fd[0]); + close (se_fd[0]); waitpid (pid, NULL, 0); + if (stdin_pid >= 0) waitpid (stdin_pid, NULL, 0); return -1; } if (FD_ISSET (so_fd[0], &rset2)) { /* something on stdout */ r = read (so_fd[0], buf, sizeof buf); if (r == -1) { - perror ("read"); - waitpid (pid, NULL, 0); - return -1; + perror ("read"); + goto quit; } - if (r == 0) quit = 1; + if (r == 0) { FD_CLR (so_fd[0], &rset); quit++; } if (r > 0 && stdoutput) { - so_size += r; - *stdoutput = realloc (*stdoutput, so_size); - if (*stdoutput == NULL) { - perror ("realloc"); - *stdoutput = NULL; - continue; - } - memcpy (*stdoutput + so_size - r, buf, r); + so_size += r; + p = realloc (*stdoutput, so_size); + if (p == NULL) { + perror ("realloc"); + goto quit; + } + *stdoutput = p; + memcpy (*stdoutput + so_size - r, buf, r); } } if (FD_ISSET (se_fd[0], &rset2)) { /* something on stderr */ r = read (se_fd[0], buf, sizeof buf); if (r == -1) { - perror ("read"); - waitpid (pid, NULL, 0); - return -1; + perror ("read"); + goto quit; } - if (r == 0) quit = 1; - - if (r > 0 && stderror) { - se_size += r; - *stderror = realloc (*stderror, se_size); - if (*stderror == NULL) { - perror ("realloc"); - *stderror = NULL; - continue; - } - memcpy (*stderror + se_size - r, buf, r); + if (r == 0) { FD_CLR (se_fd[0], &rset); quit++; } + + if (r > 0) { + if (verbose) + ignore_value (write (2, buf, r)); + + if (stderror) { + se_size += r; + p = realloc (*stderror, se_size); + if (p == NULL) { + perror ("realloc"); + goto quit; + } + *stderror = p; + memcpy (*stderror + se_size - r, buf, r); + } } } } + close (so_fd[0]); + close (se_fd[0]); + /* Make sure the output buffers are \0-terminated. Also remove any * trailing \n characters from the error buffer (not from stdout). */ if (stdoutput) { - *stdoutput = realloc (*stdoutput, so_size+1); - if (*stdoutput == NULL) { + void *q = realloc (*stdoutput, so_size+1); + if (q == NULL) { perror ("realloc"); - *stdoutput = NULL; - } else + free (*stdoutput); + } + *stdoutput = q; + if (*stdoutput) (*stdoutput)[so_size] = '\0'; } if (stderror) { - *stderror = realloc (*stderror, se_size+1); - if (*stderror == NULL) { + void *q = realloc (*stderror, se_size+1); + if (q == NULL) { perror ("realloc"); - *stderror = NULL; - } else { + free (*stderror); + } + *stderror = q; + if (*stderror) { (*stderror)[se_size] = '\0'; se_size--; while (se_size >= 0 && (*stderror)[se_size] == '\n') - (*stderror)[se_size--] = '\0'; + (*stderror)[se_size--] = '\0'; + } + } + + if (flag_copy_stdin) { + /* Check copy process didn't fail. */ + if (waitpid (stdin_pid, &r, 0) != stdin_pid) { + perror ("waitpid"); + kill (pid, 9); + waitpid (pid, NULL, 0); + return -1; + } + + if (!WIFEXITED (r) || WEXITSTATUS (r) != 0) { + fprintf (stderr, "failed copying from input file, see earlier messages\n"); + kill (pid, 9); + waitpid (pid, NULL, 0); + return -1; } } /* Get the exit status of the command. */ - waitpid (pid, &r, 0); + if (waitpid (pid, &r, 0) != pid) { + perror ("waitpid"); + return -1; + } if (WIFEXITED (r)) { - if (WEXITSTATUS (r) == 0) - return 0; - else - return -1; + return WEXITSTATUS (r); } else return -1; } + +/* Split an output string into a NULL-terminated list of lines. + * Typically this is used where we have run an external command + * which has printed out a list of things, and we want to return + * an actual list. + * + * The corner cases here are quite tricky. Note in particular: + * + * "" -> [] + * "\n" -> [""] + * "a\nb" -> ["a"; "b"] + * "a\nb\n" -> ["a"; "b"] + * "a\nb\n\n" -> ["a"; "b"; ""] + * + * The original string is written over and destroyed by this + * function (which is usually OK because it's the 'out' string + * from command()). You can free the original string, because + * add_string() strdups the strings. + */ +char ** +split_lines (char *str) +{ + char **lines = NULL; + int size = 0, alloc = 0; + char *p, *pend; + + if (STREQ (str, "")) + goto empty_list; + + p = str; + while (p) { + /* Empty last line? */ + if (p[0] == '\0') + break; + + pend = strchr (p, '\n'); + if (pend) { + *pend = '\0'; + pend++; + } + + if (add_string (&lines, &size, &alloc, p) == -1) { + return NULL; + } + + p = pend; + } + + empty_list: + if (add_string (&lines, &size, &alloc, NULL) == -1) + return NULL; + + return lines; +} + +/* Skip leading and trailing whitespace, updating the original string + * in-place. + */ +void +trim (char *str) +{ + size_t len = strlen (str); + + while (len > 0 && c_isspace (str[len-1])) { + str[len-1] = '\0'; + len--; + } + + const char *p = str; + while (*p && c_isspace (*p)) { + p++; + len--; + } + + memmove (str, p, len+1); +} + +/* printf helper function so we can use %Q ("quoted") and %R to print + * shell-quoted strings. See HACKING file for more details. + */ +static int +print_shell_quote (FILE *stream, + const struct printf_info *info ATTRIBUTE_UNUSED, + const void *const *args) +{ +#define SAFE(c) (c_isalnum((c)) || \ + (c) == '/' || (c) == '-' || (c) == '_' || (c) == '.') + int i, len; + const char *str = *((const char **) (args[0])); + + for (i = len = 0; str[i]; ++i) { + if (!SAFE(str[i])) { + putc ('\\', stream); + len ++; + } + putc (str[i], stream); + len ++; + } + + return len; +} + +static int +print_sysroot_shell_quote (FILE *stream, + const struct printf_info *info, + const void *const *args) +{ + fputs (sysroot, stream); + return sysroot_len + print_shell_quote (stream, info, args); +} + +#ifdef HAVE_REGISTER_PRINTF_SPECIFIER +static int +print_arginfo (const struct printf_info *info ATTRIBUTE_UNUSED, + size_t n, int *argtypes, int *size) +{ + if (n > 0) { + argtypes[0] = PA_STRING; + size[0] = sizeof (const char *); + } + return 1; +} +#else +#ifdef HAVE_REGISTER_PRINTF_FUNCTION +static int +print_arginfo (const struct printf_info *info, size_t n, int *argtypes) +{ + if (n > 0) + argtypes[0] = PA_STRING; + return 1; +} +#else +#error "HAVE_REGISTER_PRINTF_{SPECIFIER|FUNCTION} not defined" +#endif +#endif + +/* Perform device name translation. Don't call this directly - + * use the RESOLVE_DEVICE macro. + * + * See guestfs(3) for the algorithm. + * + * We have to open the device and test for ENXIO, because + * the device nodes themselves will exist in the appliance. + */ +int +device_name_translation (char *device) +{ + int fd; + + fd = open (device, O_RDONLY); + if (fd >= 0) { + close_ok: + close (fd); + return 0; + } + + if (errno != ENXIO && errno != ENOENT) + return -1; + + /* If the name begins with "/dev/sd" then try the alternatives. */ + if (STRNEQLEN (device, "/dev/sd", 7)) + return -1; + + device[5] = 'h'; /* /dev/hd (old IDE driver) */ + fd = open (device, O_RDONLY); + if (fd >= 0) + goto close_ok; + + device[5] = 'v'; /* /dev/vd (for virtio devices) */ + fd = open (device, O_RDONLY); + if (fd >= 0) + goto close_ok; + + device[5] = 's'; /* Restore original device name. */ + return -1; +} + +/* Check program exists and is executable on $PATH. Actually, we + * just assume PATH contains the default entries (see main() above). + */ +int +prog_exists (const char *prog) +{ + static const char * const dirs[] = + { "/sbin", "/usr/sbin", "/bin", "/usr/bin" }; + size_t i; + char buf[1024]; + + for (i = 0; i < sizeof dirs / sizeof dirs[0]; ++i) { + snprintf (buf, sizeof buf, "%s/%s", dirs[i], prog); + if (access (buf, X_OK) == 0) + return 1; + } + return 0; +} + +/* LVM and other commands aren't synchronous, especially when udev is + * involved. eg. You can create or remove some device, but the /dev + * device node won't appear until some time later. This means that + * you get an error if you run one command followed by another. + * + * Use 'udevadm settle' after certain commands, but don't be too + * fussed if it fails. + * + * 'udevsettle' was the old name for this command (RHEL 5). This was + * deprecated in favour of 'udevadm settle'. The old 'udevsettle' + * command was left as a symlink. Then in Fedora 13 the old symlink + * remained but it stopped working (RHBZ#548121), so we have to be + * careful not to assume that we can use 'udevsettle' if it exists. + */ +void +udev_settle (void) +{ + (void) command (NULL, NULL, "udevadm", "settle", NULL); + (void) command (NULL, NULL, "udevsettle", NULL); +}