X-Git-Url: http://git.annexia.org/?p=libguestfs.git;a=blobdiff_plain;f=daemon%2Ffile.c;h=6062c50d55fbc277f328a71eb849ac6298ab54f7;hp=16dfb009873be63306609f783a53f293b5c46ee2;hb=0f2e9c84e9ff1071260770930068642ecc8ac0d9;hpb=05712b2457a44ee0f0020eced77db03c2aa419a1

diff --git a/daemon/file.c b/daemon/file.c
index 16dfb00..6062c50 100644
--- a/daemon/file.c
+++ b/daemon/file.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
@@ -18,8 +18,6 @@
 
 #include <config.h>
 
-#define _GNU_SOURCE		/* for futimens(2) and getline(3) */
-
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -32,9 +30,10 @@
 #include "actions.h"
 
 int
-do_touch (const char *path)
+do_touch (char *path)
 {
   int fd;
+  int r;
 
   NEED_ROOT (-1);
   ABS_PATH (path, -1);
@@ -48,18 +47,27 @@ do_touch (const char *path)
     return -1;
   }
 
-  if (futimens (fd, NULL) == -1) {
+#ifdef HAVE_FUTIMENS
+  r = futimens (fd, NULL);
+#else
+  r = futimes (fd, NULL);
+#endif
+  if (r == -1) {
     reply_with_perror ("futimens: %s", path);
     close (fd);
     return -1;
   }
 
-  close (fd);
+  if (close (fd) == -1) {
+    reply_with_perror ("close: %s", path);
+    return -1;
+  }
+
   return 0;
 }
 
 char *
-do_cat (const char *path)
+do_cat (char *path)
 {
   int fd;
   int alloc, size, r, max;
@@ -130,7 +138,7 @@ do_cat (const char *path)
 }
 
 char **
-do_read_lines (const char *path)
+do_read_lines (char *path)
 {
   char **r = NULL;
   int size = 0, alloc = 0;
@@ -182,7 +190,7 @@ do_read_lines (const char *path)
 }
 
 int
-do_rm (const char *path)
+do_rm (char *path)
 {
   int r;
 
@@ -202,7 +210,7 @@ do_rm (const char *path)
 }
 
 int
-do_chmod (int mode, const char *path)
+do_chmod (int mode, char *path)
 {
   int r;
 
@@ -222,7 +230,7 @@ do_chmod (int mode, const char *path)
 }
 
 int
-do_chown (int owner, int group, const char *path)
+do_chown (int owner, int group, char *path)
 {
   int r;
 
@@ -242,7 +250,7 @@ do_chown (int owner, int group, const char *path)
 }
 
 int
-do_exists (const char *path)
+do_exists (char *path)
 {
   int r;
 
@@ -257,7 +265,7 @@ do_exists (const char *path)
 }
 
 int
-do_is_file (const char *path)
+do_is_file (char *path)
 {
   int r;
   struct stat buf;
@@ -282,7 +290,7 @@ do_is_file (const char *path)
 }
 
 int
-do_write_file (const char *path, const char *content, int size)
+do_write_file (char *path, char *content, int size)
 {
   int fd;
 
@@ -315,27 +323,85 @@ do_write_file (const char *path, const char *content, int size)
   return 0;
 }
 
+char *
+do_read_file (char *path, size_t *size_r)
+{
+  int fd;
+  struct stat statbuf;
+  char *r;
+
+  NEED_ROOT (NULL);
+  ABS_PATH (path, NULL);
+
+  CHROOT_IN;
+  fd = open (path, O_RDONLY);
+  CHROOT_OUT;
+
+  if (fd == -1) {
+    reply_with_perror ("open: %s", path);
+    return NULL;
+  }
+
+  if (fstat (fd, &statbuf) == -1) {
+    reply_with_perror ("fstat: %s", path);
+    close (fd);
+    return NULL;
+  }
+
+  *size_r = statbuf.st_size;
+  /* The actual limit on messages is smaller than this.  This
+   * check just limits the amount of memory we'll try and allocate
+   * here.  If the message is larger than the real limit, that will
+   * be caught later when we try to serialize the message.
+   */
+  if (*size_r >= GUESTFS_MESSAGE_MAX) {
+    reply_with_error ("read_file: %s: file is too large for the protocol, use guestfs_download instead", path);
+    close (fd);
+    return NULL;
+  }
+  r = malloc (*size_r);
+  if (r == NULL) {
+    reply_with_perror ("malloc");
+    close (fd);
+    return NULL;
+  }
+
+  if (xread (fd, r, *size_r) == -1) {
+    reply_with_perror ("read: %s", path);
+    close (fd);
+    free (r);
+    return NULL;
+  }
+
+  if (close (fd) == -1) {
+    reply_with_perror ("close: %s", path);
+    free (r);
+    return NULL;
+  }
+
+  return r;
+}
+
 /* This runs the 'file' command. */
 char *
-do_file (const char *path)
+do_file (char *path)
 {
   char *out, *err;
-  int r, len, freeit = 0;
+  int r, freeit = 0;
   char *buf;
+  int len;
 
-  /*NEED_ROOT (NULL); - no: we allow people to run this on /dev devices. */
+  NEED_ROOT_OR_IS_DEVICE (path, NULL);
   ABS_PATH (path, NULL);
 
   if (strncmp (path, "/dev/", 5) == 0)
     buf = (char *) path;
   else {
-    len = strlen (path) + 9;
-    buf = malloc (len);
+    buf = sysroot_path (path);
     if (!buf) {
       reply_with_perror ("malloc");
       return NULL;
     }
-    snprintf (buf, len, "/sysroot%s", path);
     freeit = 1;
   }
 
@@ -368,3 +434,60 @@ do_file (const char *path)
 
   return out;			/* caller frees */
 }
+
+/* zcat | file */
+char *
+do_zfile (char *method, char *path)
+{
+  int len;
+  const char *zcat;
+  char *cmd;
+  FILE *fp;
+  char line[256];
+
+  NEED_ROOT (NULL);
+  ABS_PATH (path, NULL);
+
+  if (strcmp (method, "gzip") == 0 || strcmp (method, "compress") == 0)
+    zcat = "zcat";
+  else if (strcmp (method, "bzip2") == 0)
+    zcat = "bzcat";
+  else {
+    reply_with_error ("zfile: unknown method");
+    return NULL;
+  }
+
+  if (asprintf_nowarn (&cmd, "%s %R | file -bsL -", zcat, path) == -1) {
+    reply_with_perror ("asprintf");
+    return NULL;
+  }
+
+  if (verbose)
+    fprintf (stderr, "%s\n", cmd);
+
+  fp = popen (cmd, "r");
+  if (fp == NULL) {
+    reply_with_perror ("%s", cmd);
+    free (cmd);
+    return NULL;
+  }
+
+  free (cmd);
+
+  if (fgets (line, sizeof line, fp) == NULL) {
+    reply_with_perror ("zfile: fgets");
+    fclose (fp);
+    return NULL;
+  }
+
+  if (fclose (fp) == -1) {
+    reply_with_perror ("zfile: fclose");
+    return NULL;
+  }
+
+  len = strlen (line);
+  if (len > 0 && line[len-1] == '\n')
+    line[len-1] = '\0';
+
+  return strdup (line);
+}