X-Git-Url: http://git.annexia.org/?p=libguestfs.git;a=blobdiff_plain;f=daemon%2Ffile.c;h=62de1168e6dd80bcbef8f2de385e8c976d538692;hp=9cc324fbd4c418932e7cd7784fc0f9f8785a0e42;hb=3e70b34eed5a48640e20fbf6dcba774aaace1f3c;hpb=302c18e7d095755ab1bcd0b79fd8952e2450ac7a;ds=sidebyside

diff --git a/daemon/file.c b/daemon/file.c
index 9cc324f..62de116 100644
--- a/daemon/file.c
+++ b/daemon/file.c
@@ -30,14 +30,11 @@
 #include "actions.h"
 
 int
-do_touch (char *path)
+do_touch (const char *path)
 {
   int fd;
   int r;
 
-  NEED_ROOT (-1);
-  ABS_PATH (path, return -1);
-
   CHROOT_IN;
   fd = open (path, O_WRONLY | O_CREAT | O_NOCTTY, 0666);
   CHROOT_OUT;
@@ -67,15 +64,12 @@ do_touch (char *path)
 }
 
 char *
-do_cat (char *path)
+do_cat (const char *path)
 {
   int fd;
   int alloc, size, r, max;
   char *buf, *buf2;
 
-  NEED_ROOT (NULL);
-  ABS_PATH (path, return NULL);
-
   CHROOT_IN;
   fd = open (path, O_RDONLY);
   CHROOT_OUT;
@@ -138,7 +132,7 @@ do_cat (char *path)
 }
 
 char **
-do_read_lines (char *path)
+do_read_lines (const char *path)
 {
   char **r = NULL;
   int size = 0, alloc = 0;
@@ -147,9 +141,6 @@ do_read_lines (char *path)
   size_t len = 0;
   ssize_t n;
 
-  NEED_ROOT (NULL);
-  ABS_PATH (path, return NULL);
-
   CHROOT_IN;
   fp = fopen (path, "r");
   CHROOT_OUT;
@@ -190,13 +181,10 @@ do_read_lines (char *path)
 }
 
 int
-do_rm (char *path)
+do_rm (const char *path)
 {
   int r;
 
-  NEED_ROOT (-1);
-  ABS_PATH (path, return -1);
-
   CHROOT_IN;
   r = unlink (path);
   CHROOT_OUT;
@@ -210,13 +198,10 @@ do_rm (char *path)
 }
 
 int
-do_chmod (int mode, char *path)
+do_chmod (int mode, const char *path)
 {
   int r;
 
-  NEED_ROOT (-1);
-  ABS_PATH (path, return -1);
-
   CHROOT_IN;
   r = chmod (path, mode);
   CHROOT_OUT;
@@ -230,13 +215,10 @@ do_chmod (int mode, char *path)
 }
 
 int
-do_chown (int owner, int group, char *path)
+do_chown (int owner, int group, const char *path)
 {
   int r;
 
-  NEED_ROOT (-1);
-  ABS_PATH (path, return -1);
-
   CHROOT_IN;
   r = chown (path, owner, group);
   CHROOT_OUT;
@@ -250,12 +232,26 @@ do_chown (int owner, int group, char *path)
 }
 
 int
-do_exists (char *path)
+do_lchown (int owner, int group, const char *path)
 {
   int r;
 
-  NEED_ROOT (-1);
-  ABS_PATH (path, return -1);
+  CHROOT_IN;
+  r = lchown (path, owner, group);
+  CHROOT_OUT;
+
+  if (r == -1) {
+    reply_with_perror ("lchown: %s: %d.%d", path, owner, group);
+    return -1;
+  }
+
+  return 0;
+}
+
+int
+do_exists (const char *path)
+{
+  int r;
 
   CHROOT_IN;
   r = access (path, F_OK);
@@ -265,14 +261,11 @@ do_exists (char *path)
 }
 
 int
-do_is_file (char *path)
+do_is_file (const char *path)
 {
   int r;
   struct stat buf;
 
-  NEED_ROOT (-1);
-  ABS_PATH (path, return -1);
-
   CHROOT_IN;
   r = lstat (path, &buf);
   CHROOT_OUT;
@@ -290,13 +283,10 @@ do_is_file (char *path)
 }
 
 int
-do_write_file (char *path, char *content, int size)
+do_write_file (const char *path, const char *content, int size)
 {
   int fd;
 
-  NEED_ROOT (-1);
-  ABS_PATH (path, return -1);
-
   if (size == 0)
     size = strlen (content);
 
@@ -324,15 +314,12 @@ do_write_file (char *path, char *content, int size)
 }
 
 char *
-do_read_file (char *path, size_t *size_r)
+do_read_file (const char *path, size_t *size_r)
 {
   int fd;
   struct stat statbuf;
   char *r;
 
-  NEED_ROOT (NULL);
-  ABS_PATH (path, return NULL);
-
   CHROOT_IN;
   fd = open (path, O_RDONLY);
   CHROOT_OUT;
@@ -382,18 +369,68 @@ do_read_file (char *path, size_t *size_r)
   return r;
 }
 
+char *
+do_pread (const char *path, int count, int64_t offset, size_t *size_r)
+{
+  int fd;
+  ssize_t r;
+  char *buf;
+
+  /* The actual limit on messages is smaller than this.  This check
+   * just limits the amount of memory we'll try and allocate in the
+   * function.  If the message is larger than the real limit, that
+   * will be caught later when we try to serialize the message.
+   */
+  if (count >= GUESTFS_MESSAGE_MAX) {
+    reply_with_error ("pread: %s: count is too large for the protocol, use smaller reads", path);
+    return NULL;
+  }
+
+  CHROOT_IN;
+  fd = open (path, O_RDONLY);
+  CHROOT_OUT;
+
+  if (fd == -1) {
+    reply_with_perror ("open: %s", path);
+    return NULL;
+  }
+
+  buf = malloc (count);
+  if (buf == NULL) {
+    reply_with_perror ("malloc");
+    close (fd);
+    return NULL;
+  }
+
+  r = pread (fd, buf, count, offset);
+  if (r == -1) {
+    reply_with_perror ("pread: %s", path);
+    close (fd);
+    free (buf);
+    return NULL;
+  }
+
+  if (close (fd) == -1) {
+    reply_with_perror ("close: %s", path);
+    close (fd);
+    free (buf);
+    return NULL;
+  }
+
+  *size_r = r;
+  return buf;
+}
+
 /* This runs the 'file' command. */
 char *
-do_file (char *path)
+do_file (const char *path)
 {
   char *out, *err;
   int r, freeit = 0;
   char *buf;
   int len;
 
-  NEED_ROOT_OR_IS_DEVICE (path, return NULL);
-
-  if (strncmp (path, "/dev/", 5) == 0)
+  if (STREQLEN (path, "/dev/", 5))
     buf = (char *) path;
   else {
     buf = sysroot_path (path);
@@ -436,7 +473,7 @@ do_file (char *path)
 
 /* zcat | file */
 char *
-do_zfile (char *method, char *path)
+do_zfile (const char *method, const char *path)
 {
   int len;
   const char *zcat;
@@ -444,9 +481,6 @@ do_zfile (char *method, char *path)
   FILE *fp;
   char line[256];
 
-  NEED_ROOT (NULL);
-  ABS_PATH (path, return NULL);
-
   if (strcmp (method, "gzip") == 0 || strcmp (method, "compress") == 0)
     zcat = "zcat";
   else if (strcmp (method, "bzip2") == 0)