Uci Command To Change Gateway Address

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• For better expreience and convenint editing, detail codes are listed below.

  Compile：
      cc -I$HOME/usr/include -L$HOME/usr/lib setaddr.c -luci -o setaddr
  Run the compiled example binary:
      export LD_LIBRARY_PATH=$HOME/usr/lib
       ./setaddr

   

  #include <stdio.h>
  #include <string.h>
  #include <uci.h>
  #include <stdlib.h>
  //Simple define a related package       
  #define UCI_CFG_PKG "/etc/config/network"
  #define UCI_PACKAGE "network"
  #define UCI_SECTION "lan"
  #define UCI_OPTION "ipaddr"
  #define UCI_VALUE "192.168.2.12"

  static int uci_set_option_string(const char *section, const char *option, const char *value)
  {
          int ret;
          struct uci_context *ctx = NULL;
          struct uci_package* pkg;
          struct uci_section* sec;
          struct uci_ptr ptr;

          char* err_str = NULL;
          char err_msg[256] = {'\0'};

          if(ctx == NULL)
          {
                  ctx = uci_alloc_context();              //apply a context
                  if(ctx==NULL)
                  {
                          snprintf(err_msg, sizeof(err_msg),"Failed to alloc uci context");
                          return -1;
                  }
          }

          ret = uci_load(ctx, UCI_CFG_PKG, &pkg);         //Load required uci file
          if(ret !=0 || pkg == NULL)
          {
                  snprintf(err_msg, sizeof(err_msg),"Failed to load package: '%s' with error", UCI_CFG_PKG);
                  goto error_pkg;
          }

          sec = uci_lookup_section(ctx, pkg, section);
          if(sec == NULL)
          {
                  snprintf(err_msg, sizeof(err_msg), "Failed to find section: '%s'", section);
                  goto error_msg;
          }

          memset(&ptr, 0, sizeof(struct uci_ptr));

          ptr.package = UCI_PACKAGE;
          ptr.section = section;
          ptr.option = option;
          ptr.value = value;

          ptr.p = pkg;
          ptr.s = sec;

    ret = uci_set(ctx, &ptr);
          if(ret != 0)
          {
                  snprintf(err_msg, sizeof(err_msg), "Failed to set option: '%s' with error", option);
                  goto error_uci;
          }

          uci_save(ctx, pkg);
          uci_commit(ctx, &pkg, false);           //Commit the changes or it will not effect the local file.  

          uci_unload(ctx, pkg);
          uci_free_context(ctx);
          return 0;

          error_uci:
                  uci_unload(ctx, pkg);
          error_pkg:
                  uci_get_errorstr(ctx, &err_str, err_msg);
                  free(err_str);
                  return -1;
          error_msg:
                  uci_unload(ctx, pkg);
                  return -1;
  }

  int main(int argc, char **argv)
  {
          uci_set_option_string(UCI_SECTION, UCI_OPTION, UCI_VALUE);
          return 0;
  }
                       

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