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Unverified Commit 387c1c70 by Christian Brauner
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network: convert to strnprintf()

Signed-off-by: 's avatarChristian Brauner <christian.brauner@ubuntu.com>
parent d0c6b86e
Showing with 51 additions and 54 deletions
src/lxc/network.c
......@@ -231,10 +231,10 @@ static int lxc_is_ip_forwarding_enabled(const char *ifname, int family)
if (family != AF_INET && family != AF_INET6)
return ret_set_errno(-1, EINVAL);
ret = snprintf(path, sizeof(path), "/proc/sys/net/%s/conf/%s/%s",
family == AF_INET ? "ipv4" : "ipv6", ifname,
"forwarding");
if (ret < 0 || (size_t)ret >= sizeof(path))
ret = strnprintf(path, sizeof(path), "/proc/sys/net/%s/conf/%s/%s",
family == AF_INET ? "ipv4" : "ipv6", ifname,
"forwarding");
if (ret < 0)
return ret_set_errno(-1, E2BIG);
return lxc_read_file_expect(path, buf, 1, "1");
......@@ -359,8 +359,8 @@ static int setup_veth_native_bridge_vlan(char *veth1, struct lxc_netdev *netdev)
return 0;
/* Check vlan filtering is enabled on parent bridge. */
rc = snprintf(path, sizeof(path), "/sys/class/net/%s/bridge/vlan_filtering", netdev->link);
if (rc < 0 || (size_t)rc >= sizeof(path))
rc = strnprintf(path, sizeof(path), "/sys/class/net/%s/bridge/vlan_filtering", netdev->link);
if (rc < 0)
return -1;
rc = lxc_read_from_file(path, buf, sizeof(buf));
......@@ -382,8 +382,8 @@ static int setup_veth_native_bridge_vlan(char *veth1, struct lxc_netdev *netdev)
unsigned short default_pvid;
/* Get the bridge's default VLAN PVID. */
rc = snprintf(path, sizeof(path), "/sys/class/net/%s/bridge/default_pvid", netdev->link);
if (rc < 0 || (size_t)rc >= sizeof(path))
rc = strnprintf(path, sizeof(path), "/sys/class/net/%s/bridge/default_pvid", netdev->link);
if (rc < 0)
return -1;
rc = lxc_read_from_file(path, buf, sizeof(buf));
......@@ -443,8 +443,8 @@ static int lxc_ovs_setup_bridge_vlan_exec(void *data)
char buf[5];
int rc;
rc = snprintf(buf, sizeof(buf), "%u", args->vlan_id);
if (rc < 0 || (size_t)rc >= sizeof(buf))
rc = strnprintf(buf, sizeof(buf), "%u", args->vlan_id);
if (rc < 0)
return log_error_errno(-1, EINVAL, "Failed to parse ovs bridge vlan \"%d\"", args->vlan_id);
tag = must_concat(NULL, "tag=", buf, (char *)NULL);
......@@ -509,8 +509,8 @@ static int setup_veth_ovs_bridge_vlan(char *veth1, struct lxc_netdev *netdev)
char buf[5]; /* Sufficient size to fit max VLAN ID (4094) null char. */
int rc;
rc = snprintf(buf, sizeof(buf), "%u", vlan_id);
if (rc < 0 || (size_t)rc >= sizeof(buf)) {
rc = strnprintf(buf, sizeof(buf), "%u", vlan_id);
if (rc < 0) {
free_ovs_veth_vlan_args(&args);
return log_error_errno(-1, EINVAL, "Failed to parse tagged vlan \"%u\" for interface \"%s\"", vlan_id, veth1);
}
......@@ -553,8 +553,8 @@ static int instantiate_veth(struct lxc_handler *handler, struct lxc_netdev *netd
if (handler->conf->reboot)
lxc_netdev_delete_by_name(veth1);
} else {
err = snprintf(veth1buf, sizeof(veth1buf), "vethXXXXXX");
if (err < 0 || (size_t)err >= sizeof(veth1buf))
err = strnprintf(veth1buf, sizeof(veth1buf), "vethXXXXXX");
if (err < 0)
return -1;
veth1 = lxc_ifname_alnum_case_sensitive(veth1buf);
......@@ -565,8 +565,8 @@ static int instantiate_veth(struct lxc_handler *handler, struct lxc_netdev *netd
memcpy(netdev->priv.veth_attr.veth1, veth1, IFNAMSIZ);
}
err = snprintf(veth2buf, sizeof(veth2buf), "vethXXXXXX");
if (err < 0 || (size_t)err >= sizeof(veth2buf))
err = strnprintf(veth2buf, sizeof(veth2buf), "vethXXXXXX");
if (err < 0)
return -1;
veth2 = lxc_ifname_alnum_case_sensitive(veth2buf);
......@@ -781,8 +781,8 @@ static int instantiate_macvlan(struct lxc_handler *handler, struct lxc_netdev *n
return -1;
}
err = snprintf(peer, sizeof(peer), "mcXXXXXX");
if (err < 0 || (size_t)err >= sizeof(peer))
err = strnprintf(peer, sizeof(peer), "mcXXXXXX");
if (err < 0)
return -1;
if (!lxc_ifname_alnum_case_sensitive(peer))
......@@ -931,8 +931,8 @@ static int instantiate_ipvlan(struct lxc_handler *handler, struct lxc_netdev *ne
return -1;
}
err = snprintf(peer, sizeof(peer), "ipXXXXXX");
if (err < 0 || (size_t)err >= sizeof(peer))
err = strnprintf(peer, sizeof(peer), "ipXXXXXX");
if (err < 0)
return -1;
if (!lxc_ifname_alnum_case_sensitive(peer))
......@@ -1006,9 +1006,9 @@ static int instantiate_vlan(struct lxc_handler *handler, struct lxc_netdev *netd
return -1;
}
err = snprintf(peer, sizeof(peer), "vlan%d-%d",
netdev->priv.vlan_attr.vid, vlan_cntr++);
if (err < 0 || (size_t)err >= sizeof(peer))
err = strnprintf(peer, sizeof(peer), "vlan%d-%d",
netdev->priv.vlan_attr.vid, vlan_cntr++);
if (err < 0)
return -1;
err = lxc_vlan_create(netdev->link, peer, netdev->priv.vlan_attr.vid);
......@@ -1489,8 +1489,8 @@ char *is_wlan(const char *ifname)
len = strlen(ifname) + strlen(PHYSNAME) - 1;
path = must_realloc(NULL, len + 1);
ret = snprintf(path, len, PHYSNAME, ifname);
if (ret < 0 || (size_t)ret >= len)
ret = strnprintf(path, len, PHYSNAME, ifname);
if (ret < 0)
return NULL;
f = fopen(path, "re");
......@@ -2217,9 +2217,10 @@ static int ip_forwarding_set(const char *ifname, int family, int flag)
if (family != AF_INET && family != AF_INET6)
return -EINVAL;
ret = snprintf(path, sizeof(path), "/proc/sys/net/%s/conf/%s/%s",
family == AF_INET ? "ipv4" : "ipv6", ifname, "forwarding");
if (ret < 0 || (size_t)ret >= sizeof(path))
ret = strnprintf(path, sizeof(path), "/proc/sys/net/%s/conf/%s/%s",
family == AF_INET ? "ipv4" : "ipv6", ifname,
"forwarding");
if (ret < 0)
return -E2BIG;
return proc_sys_net_write(path, flag ? "1" : "0");
......@@ -2243,10 +2244,10 @@ static int neigh_proxy_set(const char *ifname, int family, int flag)
if (family != AF_INET && family != AF_INET6)
return -EINVAL;
ret = snprintf(path, sizeof(path), "/proc/sys/net/%s/conf/%s/%s",
family == AF_INET ? "ipv4" : "ipv6", ifname,
family == AF_INET ? "proxy_arp" : "proxy_ndp");
if (ret < 0 || (size_t)ret >= sizeof(path))
ret = strnprintf(path, sizeof(path), "/proc/sys/net/%s/conf/%s/%s",
family == AF_INET ? "ipv4" : "ipv6", ifname,
family == AF_INET ? "proxy_arp" : "proxy_ndp");
if (ret < 0)
return -E2BIG;
return proc_sys_net_write(path, flag ? "1" : "0");
......@@ -2261,10 +2262,10 @@ static int lxc_is_ip_neigh_proxy_enabled(const char *ifname, int family)
if (family != AF_INET && family != AF_INET6)
return ret_set_errno(-1, EINVAL);
ret = snprintf(path, sizeof(path), "/proc/sys/net/%s/conf/%s/%s",
family == AF_INET ? "ipv4" : "ipv6", ifname,
family == AF_INET ? "proxy_arp" : "proxy_ndp");
if (ret < 0 || (size_t)ret >= sizeof(path))
ret = strnprintf(path, sizeof(path), "/proc/sys/net/%s/conf/%s/%s",
family == AF_INET ? "ipv4" : "ipv6", ifname,
family == AF_INET ? "proxy_arp" : "proxy_ndp");
if (ret < 0)
return ret_set_errno(-1, E2BIG);
return lxc_read_file_expect(path, buf, 1, "1");
......@@ -2629,9 +2630,9 @@ bool is_ovs_bridge(const char *bridge)
struct stat sb;
char brdirname[22 + IFNAMSIZ + 1] = {0};
ret = snprintf(brdirname, 22 + IFNAMSIZ + 1, "/sys/class/net/%s/bridge",
bridge);
if (ret < 0 || (size_t)ret >= 22 + IFNAMSIZ + 1)
ret = strnprintf(brdirname, 22 + IFNAMSIZ + 1,
"/sys/class/net/%s/bridge", bridge);
if (ret < 0)
return false;
ret = stat(brdirname, &sb);
......@@ -2795,28 +2796,24 @@ char *lxc_ifname_alnum_case_sensitive(char *template)
int setup_private_host_hw_addr(char *veth1)
{
int err, sockfd;
__do_close int sockfd = -EBADF;
int err;
struct ifreq ifr;
sockfd = socket(AF_INET, SOCK_DGRAM | SOCK_CLOEXEC, 0);
if (sockfd < 0)
return -errno;
err = snprintf((char *)ifr.ifr_name, IFNAMSIZ, "%s", veth1);
if (err < 0 || (size_t)err >= IFNAMSIZ) {
close(sockfd);
return -E2BIG;
}
err = strnprintf((char *)ifr.ifr_name, IFNAMSIZ, "%s", veth1);
if (err < 0)
return err;
err = ioctl(sockfd, SIOCGIFHWADDR, &ifr);
if (err < 0) {
close(sockfd);
if (err < 0)
return -errno;
}
ifr.ifr_hwaddr.sa_data[0] = 0xfe;
err = ioctl(sockfd, SIOCSIFHWADDR, &ifr);
close(sockfd);
if (err < 0)
return -errno;
......@@ -2910,8 +2907,8 @@ static int lxc_create_network_unpriv_exec(const char *lxcpath, const char *lxcna
_exit(EXIT_FAILURE);
}
ret = snprintf(pidstr, sizeof(pidstr), "%d", pid);
if (ret < 0 || ret >= sizeof(pidstr))
ret = strnprintf(pidstr, sizeof(pidstr), "%d", pid);
if (ret < 0)
_exit(EXIT_FAILURE);
pidstr[sizeof(pidstr) - 1] = '\0';
......@@ -3108,9 +3105,9 @@ static bool lxc_delete_network_unpriv(struct lxc_handler *handler)
if (handler->nsfd[LXC_NS_NET] < 0)
return log_debug(false, "Cannot not guarantee safe deletion of network devices. Manual cleanup maybe needed");
ret = snprintf(netns_path, sizeof(netns_path), "/proc/%d/fd/%d",
lxc_raw_getpid(), handler->nsfd[LXC_NS_NET]);
if (ret < 0 || ret >= sizeof(netns_path))
ret = strnprintf(netns_path, sizeof(netns_path), "/proc/%d/fd/%d",
lxc_raw_getpid(), handler->nsfd[LXC_NS_NET]);
if (ret < 0)
return false;
lxc_list_for_each(iterator, network) {
......
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