netifd: Fix restore of original device settings

[project/netifd.git] / utils.c

diff --git a/utils.c b/utils.c
index 14e966a..aa4132b 100644 (file)
--- a/utils.c
+++ b/utils.c
@@ -18,6 +18,10 @@
 #include <arpa/inet.h>
 #include <netinet/in.h>
 
+#ifdef __APPLE__
+#include <libproc.h>
+#endif
+
 void
 __vlist_simple_init(struct vlist_simple_tree *tree, int offset)
 {
@@ -140,3 +144,73 @@ format_macaddr(uint8_t *mac)
 
        return str;
 }
+
+uint32_t
+crc32_file(FILE *fp)
+{
+       static uint32_t *crcvals = NULL;
+       if (!crcvals) {
+               crcvals = malloc(sizeof(*crcvals) * 256);
+
+               for (size_t i = 0; i < 256; ++i) {
+                       uint32_t c = i;
+                       for (size_t j = 0; j < 8; ++j)
+                               c = (c & 1) ? (0xEDB88320 ^ (c >> 1)) : (c >> 1);
+                       crcvals[i] = c;
+               }
+       }
+
+       uint8_t buf[1024];
+       size_t len;
+       uint32_t c = 0xFFFFFFFF;
+
+       do {
+               len = fread(buf, 1, sizeof(buf), fp);
+               for (size_t i = 0; i < len; ++i)
+                       c = crcvals[(c ^ buf[i]) & 0xFF] ^ (c >> 8);
+       } while (len == sizeof(buf));
+
+       return c ^ 0xFFFFFFFF;
+}
+
+bool check_pid_path(int pid, const char *exe)
+{
+       int proc_exe_len;
+       int exe_len = strlen(exe);
+
+#ifdef __APPLE__
+       char proc_exe_buf[PROC_PIDPATHINFO_SIZE];
+
+       proc_exe_len = proc_pidpath(pid, proc_exe_buf, sizeof(proc_exe_buf));
+#else
+       char proc_exe[32];
+       char *proc_exe_buf = alloca(exe_len);
+
+       sprintf(proc_exe, "/proc/%d/exe", pid);
+       proc_exe_len = readlink(proc_exe, proc_exe_buf, exe_len);
+#endif
+
+       if (proc_exe_len != exe_len)
+               return false;
+
+       return !memcmp(exe, proc_exe_buf, exe_len);
+}
+
+static const char * const uci_validate_name[__BLOBMSG_TYPE_LAST] = {
+       [BLOBMSG_TYPE_STRING] = "string",
+       [BLOBMSG_TYPE_ARRAY] = "list(string)",
+       [BLOBMSG_TYPE_INT32] = "uinteger",
+       [BLOBMSG_TYPE_BOOL] = "bool",
+};
+
+const char*
+uci_get_validate_string(const struct uci_blob_param_list *p, int i)
+{
+       if (p->validate[i])
+               return p->validate[i];
+
+       else if (uci_validate_name[p->params[i].type])
+               return uci_validate_name[p->params[i].type];
+
+       return p->validate[BLOBMSG_TYPE_STRING];
+}