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use getline instead of fgets

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The getline function allocate the needed memory. Fix buffer can lead
to 'hard to find' bug. I don't test the pivot_root part but the other
parts are ok.

Signed-off-by: Clement Calmels <clement.calmels@fr.ibm.com>
Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
This commit is contained in:
Clement Calmels 2010-01-18 23:08:12 +01:00 committed by Daniel Lezcano
parent 8eec72f75d
commit 2382ecffdb
4 changed files with 15 additions and 18 deletions
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9
src/lxc/conf.c
View File

@ -146,7 +146,6 @@ static int configure_find_fstype_cb(char* buffer, void *data)
static int configure_find_fstype(const char *rootfs, char *fstype, int mntopt)
{
int i, found;
char buffer[MAXPATHLEN];
struct cbarg {
const char *rootfs;
@ -182,7 +181,7 @@ static int configure_find_fstype(const char *rootfs, char *fstype, int mntopt)
found = lxc_file_for_each_line(fsfile[i],
configure_find_fstype_cb,
buffer, sizeof(buffer), &cbarg);
&cbarg);
if (found < 0) {
SYSERROR("failed to read '%s'", fsfile[i]);
@ -396,7 +395,7 @@ static int setup_rootfs_pivot_root_cb(char *buffer, void *data)
static int setup_rootfs_pivot_root(const char *rootfs, const char *pivotdir)
{
char path[MAXPATHLEN], buffer[MAXPATHLEN];
char path[MAXPATHLEN];
void *cbparm[2];
struct lxc_list mountlist, *iterator;
int ok, still_mounted, last_still_mounted;
@ -458,9 +457,7 @@ static int setup_rootfs_pivot_root(const char *rootfs, const char *pivotdir)
}
snprintf(path, sizeof(path), "/%s/proc/mounts", pivotdir);
ok = lxc_file_for_each_line(path,
setup_rootfs_pivot_root_cb,
buffer, sizeof(buffer), &cbparm);
ok = lxc_file_for_each_line(path, setup_rootfs_pivot_root_cb, &cbparm);
if (ok < 0) {
SYSERROR("failed to read or parse mount list '%s'", path);
return -1;

5
src/lxc/confile.c
View File

@ -666,10 +666,7 @@ int lxc_config_readline(char *buffer, struct lxc_conf *conf)
int lxc_config_read(const char *file, struct lxc_conf *conf)
{
char buffer[MAXPATHLEN];
return lxc_file_for_each_line(file, parse_line, buffer,
sizeof(buffer), conf);
return lxc_file_for_each_line(file, parse_line, conf);
}
int lxc_config_define_add(struct lxc_list *defines, char* arg)

17
src/lxc/parse.c
View File

@ -64,11 +64,12 @@ int lxc_dir_for_each(const char *name, const char *directory,
return ret;
}
int lxc_file_for_each_line(const char *file, lxc_file_cb callback,
char *buffer, size_t len, void* data)
int lxc_file_for_each_line(const char *file, lxc_file_cb callback, void *data)
{
FILE *f;
int err = 0;
char *line = NULL;
size_t len = 0;
f = fopen(file, "r");
if (!f) {
@ -76,14 +77,16 @@ int lxc_file_for_each_line(const char *file, lxc_file_cb callback,
return -1;
}
while (fgets(buffer, len, f)) {
err = callback(buffer, data);
while (getline(&line, &len, f) != -1) {
err = callback(line, data);
if (err) {
ERROR("failed to process '%s'", buffer);
goto out;
ERROR("failed to process '%s'", line);
break;
}
}
out:
if (line)
free(line);
fclose(f);
return err;
}

2
src/lxc/parse.h
View File

@ -32,7 +32,7 @@ extern int lxc_dir_for_each(const char *name, const char *directory,
lxc_dir_cb callback, void *data);
extern int lxc_file_for_each_line(const char *file, lxc_file_cb callback,
char *buffer, size_t len, void* data);
void* data);
extern int lxc_char_left_gc(char *buffer, size_t len);