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tools: hv: properly handle long paths 

Paths can be up to PATH_MAX long and PATH_MAX is usually greater than 256.
While on it, simplify path reconstruction to a simple snprintf(), define
and reuse KVP_NET_DIR.

Suggested-by: Tomas Hozza <thozza@redhat.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Vitaly Kuznetsov 2017-04-30 16:21:15 -07:00 committed by Greg Kroah-Hartman
parent 6113e3d281
commit a1a7ea6bd6
1 changed files with 18 additions and 26 deletions
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44
tools/hv/hv_kvp_daemon.c
View File

@ -39,6 +39,7 @@
#include <fcntl.h>
#include <dirent.h>
#include <net/if.h>
#include <limits.h>
#include <getopt.h>
/*
@ -97,6 +98,8 @@ static struct utsname uts_buf;
#define KVP_SCRIPTS_PATH "/usr/libexec/hypervkvpd/"
#endif
#define KVP_NET_DIR "/sys/class/net/"
#define MAX_FILE_NAME 100
#define ENTRIES_PER_BLOCK 50
@ -596,26 +599,21 @@ static char *kvp_get_if_name(char *guid)
DIR *dir;
struct dirent *entry;
FILE *file;
char *p, *q, *x;
char *p, *x;
char *if_name = NULL;
char buf[256];
char *kvp_net_dir = "/sys/class/net/";
char dev_id[256];
char dev_id[PATH_MAX];
dir = opendir(kvp_net_dir);
dir = opendir(KVP_NET_DIR);
if (dir == NULL)
return NULL;
snprintf(dev_id, sizeof(dev_id), "%s", kvp_net_dir);
q = dev_id + strlen(kvp_net_dir);
while ((entry = readdir(dir)) != NULL) {
/*
* Set the state for the next pass.
*/
*q = '\0';
strcat(dev_id, entry->d_name);
strcat(dev_id, "/device/device_id");
snprintf(dev_id, sizeof(dev_id), "%s%s/device/device_id",
KVP_NET_DIR, entry->d_name);
file = fopen(dev_id, "r");
if (file == NULL)
@ -653,12 +651,12 @@ static char *kvp_if_name_to_mac(char *if_name)
FILE *file;
char *p, *x;
char buf[256];
char addr_file[256];
char addr_file[PATH_MAX];
unsigned int i;
char *mac_addr = NULL;
snprintf(addr_file, sizeof(addr_file), "%s%s%s", "/sys/class/net/",
if_name, "/address");
snprintf(addr_file, sizeof(addr_file), "%s%s%s", KVP_NET_DIR,
if_name, "/address");
file = fopen(addr_file, "r");
if (file == NULL)
@ -688,28 +686,22 @@ static char *kvp_mac_to_if_name(char *mac)
DIR *dir;
struct dirent *entry;
FILE *file;
char *p, *q, *x;
char *p, *x;
char *if_name = NULL;
char buf[256];
char *kvp_net_dir = "/sys/class/net/";
char dev_id[256];
char dev_id[PATH_MAX];
unsigned int i;
dir = opendir(kvp_net_dir);
dir = opendir(KVP_NET_DIR);
if (dir == NULL)
return NULL;
snprintf(dev_id, sizeof(dev_id), "%s", kvp_net_dir);
q = dev_id + strlen(kvp_net_dir);
while ((entry = readdir(dir)) != NULL) {
/*
* Set the state for the next pass.
*/
*q = '\0';
strcat(dev_id, entry->d_name);
strcat(dev_id, "/address");
snprintf(dev_id, sizeof(dev_id), "%s%s/address", KVP_NET_DIR,
entry->d_name);
file = fopen(dev_id, "r");
if (file == NULL)
@ -1218,9 +1210,9 @@ static int process_ip_string(FILE *f, char *ip_string, int type)
static int kvp_set_ip_info(char *if_name, struct hv_kvp_ipaddr_value *new_val)
{
int error = 0;
char if_file[128];
char if_file[PATH_MAX];
FILE *file;
char cmd[512];
char cmd[PATH_MAX];
char *mac_addr;
/*