embeddable-wg-library: use newer string_list
This ports 1d2d6200b8
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Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
parent
1ad6b17c35
commit
db5cb4f15c
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@ -27,8 +27,11 @@ void list_devices(void)
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perror("Unable to get device");
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continue;
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}
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wg_key_to_base64(key, device->public_key);
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printf("%s has public key %s\n", device_name, key);
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if (device->flags & WGDEVICE_HAS_PUBLIC_KEY) {
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wg_key_to_base64(key, device->public_key);
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printf("%s has public key %s\n", device_name, key);
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} else
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printf("%s has no public key\n", device_name);
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wg_for_each_peer(device, peer) {
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wg_key_to_base64(key, peer->public_key);
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printf(" - peer %s\n", key);
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@ -856,85 +856,73 @@ static void mnlg_socket_close(struct mnlg_socket *nlg)
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/* wireguard-specific parts: */
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struct inflatable_buffer {
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struct string_list {
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char *buffer;
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char *next;
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bool good;
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size_t len;
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size_t pos;
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size_t cap;
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};
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#define max(a, b) ((a) > (b) ? (a) : (b))
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static int add_next_to_inflatable_buffer(struct inflatable_buffer *buffer)
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static int string_list_add(struct string_list *list, const char *str)
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{
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size_t len, expand_to;
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char *new_buffer;
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size_t len = strlen(str) + 1;
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if (!buffer->good || !buffer->next) {
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free(buffer->next);
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buffer->good = false;
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if (len == 1)
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return 0;
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}
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len = strlen(buffer->next) + 1;
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if (len >= list->cap - list->len) {
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char *new_buffer;
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size_t new_cap = list->cap * 2;
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if (len == 1) {
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free(buffer->next);
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buffer->good = false;
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return 0;
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}
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if (buffer->len - buffer->pos <= len) {
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expand_to = max(buffer->len * 2, buffer->len + len + 1);
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new_buffer = realloc(buffer->buffer, expand_to);
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if (!new_buffer) {
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free(buffer->next);
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buffer->good = false;
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if (new_cap < list->len +len + 1)
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new_cap = list->len + len + 1;
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new_buffer = realloc(list->buffer, new_cap);
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if (!new_buffer)
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return -errno;
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}
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memset(&new_buffer[buffer->len], 0, expand_to - buffer->len);
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buffer->buffer = new_buffer;
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buffer->len = expand_to;
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list->buffer = new_buffer;
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list->cap = new_cap;
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}
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memcpy(&buffer->buffer[buffer->pos], buffer->next, len);
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free(buffer->next);
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buffer->good = false;
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buffer->pos += len;
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memcpy(list->buffer + list->len, str, len);
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list->len += len;
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list->buffer[list->len] = '\0';
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return 0;
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}
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struct interface {
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const char *name;
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bool is_wireguard;
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};
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static int parse_linkinfo(const struct nlattr *attr, void *data)
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{
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struct inflatable_buffer *buffer = data;
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struct interface *interface = data;
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if (mnl_attr_get_type(attr) == IFLA_INFO_KIND && !strcmp(WG_GENL_NAME, mnl_attr_get_str(attr)))
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buffer->good = true;
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interface->is_wireguard = true;
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return MNL_CB_OK;
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}
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static int parse_infomsg(const struct nlattr *attr, void *data)
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{
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struct inflatable_buffer *buffer = data;
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struct interface *interface = data;
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if (mnl_attr_get_type(attr) == IFLA_LINKINFO)
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return mnl_attr_parse_nested(attr, parse_linkinfo, data);
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else if (mnl_attr_get_type(attr) == IFLA_IFNAME)
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buffer->next = strdup(mnl_attr_get_str(attr));
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interface->name = mnl_attr_get_str(attr);
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return MNL_CB_OK;
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}
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static int read_devices_cb(const struct nlmsghdr *nlh, void *data)
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{
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struct inflatable_buffer *buffer = data;
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struct string_list *list = data;
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struct interface interface = { 0 };
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int ret;
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buffer->good = false;
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buffer->next = NULL;
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ret = mnl_attr_parse(nlh, sizeof(struct ifinfomsg), parse_infomsg, data);
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ret = mnl_attr_parse(nlh, sizeof(struct ifinfomsg), parse_infomsg, &interface);
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if (ret != MNL_CB_OK)
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return ret;
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ret = add_next_to_inflatable_buffer(buffer);
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if (interface.name && interface.is_wireguard)
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ret = string_list_add(list, interface.name);
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if (ret < 0)
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return ret;
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if (nlh->nlmsg_type != NLMSG_DONE)
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@ -942,7 +930,7 @@ static int read_devices_cb(const struct nlmsghdr *nlh, void *data)
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return MNL_CB_OK;
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}
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static int fetch_device_names(struct inflatable_buffer *buffer)
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static int fetch_device_names(struct string_list *list)
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{
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struct mnl_socket *nl = NULL;
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char *rtnl_buffer = NULL;
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@ -989,7 +977,7 @@ another:
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ret = -errno;
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goto cleanup;
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}
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if ((len = mnl_cb_run(rtnl_buffer, len, seq, portid, read_devices_cb, buffer)) < 0) {
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if ((len = mnl_cb_run(rtnl_buffer, len, seq, portid, read_devices_cb, list)) < 0) {
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/* Netlink returns NLM_F_DUMP_INTR if the set of all tunnels changed
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* during the dump. That's unfortunate, but is pretty common on busy
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* systems that are adding and removing tunnels all the time. Rather
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@ -1463,22 +1451,15 @@ out:
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/* first\0second\0third\0forth\0last\0\0 */
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char *wg_list_device_names(void)
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{
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struct inflatable_buffer buffer = { .len = MNL_SOCKET_BUFFER_SIZE };
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int ret;
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struct string_list list = { 0 };
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int ret = fetch_device_names(&list);
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ret = -ENOMEM;
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buffer.buffer = calloc(1, buffer.len);
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if (!buffer.buffer)
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goto err;
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ret = fetch_device_names(&buffer);
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err:
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errno = -ret;
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if (errno) {
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free(buffer.buffer);
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free(list.buffer);
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return NULL;
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}
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return buffer.buffer;
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return list.buffer ?: strdup("\0");
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}
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int wg_add_device(const char *device_name)
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