openwrt uci api: 配置文件匿名节点的操作(2)

上一篇文章里面大概说了一下怎么找到匿名节点的"名字"，这一篇说一下怎么操作匿名节点(增，删，改)，例子如下：

/*
*在配置文件中新增一个节点
*(在wireless文件中新增一个ssid节点)
*/
int add_new_section(void)
{
char acSsid[32] = {'0'}; //存储输入的ssid
char acPasswd[32] = {'0'}; //ssid对应的密码
char acEncryption[8] = {'0'};

struct uci_context *ctx = NULL;
struct uci_package *pkg = NULL;

//申请一个uci上下文
ctx = uci_alloc_context();

// 打开配置uci文件
if(UCI_OK != uci_load(ctx, "wireless", &pkg))
return -1;

//添加新的节点
if((pkg = uci_lookup_package(ctx, "wireless")) != NULL)
{
struct uci_ptr ptr = {
.p = pkg
};

// 在打开的uci配置文件中新增节点配置
uci_add_section(ctx, pkg, "wifi-iface", &ptr.s);

ptr.o = NULL;
ptr.option = "device";
ptr.value = "radio0"; //默认每个设备只有一张无线网卡
uci_set(ctx, &ptr);

ptr.o = NULL;
ptr.option = "network";
ptr.value = "lan";
uci_set(ctx, &ptr);

ptr.o = NULL;
ptr.option = "mode";
ptr.value = "ap"; //诱导器工作方式下，网卡的默认工作模式为ap
uci_set(ctx, &ptr);

ptr.o = NULL;
ptr.option = "encryption";
ptr.value = acEncryption;
uci_set(ctx, &ptr);

ptr.o = NULL;
ptr.option = "ssid";
ptr.value = acSsid;
uci_set(ctx, &ptr);

if(strcmp(acEncryption, "none"))
{
ptr.o = NULL;
ptr.option = "key";
ptr.value = acPasswd;
uci_set(ctx, &ptr);
}

uci_commit(ctx, &ptr.p, false);
uci_unload(ctx, ptr.p);
}
uci_free_context(ctx);
return 0;
}

删除一个节点(有名节点和匿名节点均可)

/*
* 按照节点的名称删除该节点
* 即删除一个ssid
*/
int delete_section(const char *acSection)
{
int ret;
struct uci_package* pkg;
struct uci_section* sec;
struct uci_ptr ptr;
char* err_str = NULL;
char err_msg[256];
struct uci_context *ctx = NULL;

if(ctx == NULL)
{
ctx = uci_alloc_context(); //申请uci上下文
if(ctx==NULL)
{
snprintf(err_msg, sizeof(err_msg), "Failed to alloc uci context");
fprintf(stderr, "[%s] %s\n", __func__, err_msg);
return -1;
}
}

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

sec = uci_lookup_section(ctx, pkg, acSection); //查找节点
if(sec != NULL)
{
memset(&ptr, 0, sizeof(struct uci_ptr));
ptr.package = "wireless";
ptr.section = acSection;
ptr.p = pkg;
ptr.s = sec;

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

uci_save(ctx, pkg);
uci_commit(ctx, &pkg, false);
}

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);
fprintf(stderr, "[%s] %s\n", __func__, err_str);
free(err_str);
return -1;
}


删除某一个节点对应的option值

/*
*删除某一个节点的一个option选项
*/
static int uci_delete_option(const char* section,const char* option)
{
int ret;
struct uci_package* pkg;
struct uci_context *ctx = NULL;
struct uci_ptr ptr;
char* err_str = NULL;
char err_msg[256];

if(ctx == NULL)
{
ctx = uci_alloc_context();
if(ctx == NULL)
{
printf("ctx alloc failed!\n");
return -1;
}
}

ret = uci_load(ctx,"wireless",&pkg);
if(ret != 0 || pkg == NULL)
{
snprintf(err_msg, sizeof(err_msg), "Failed to load package: '%s' with error", "etc/config/wireless");
printf("%s\n", err_msg);
goto error_pkg;
}

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

ptr.package = "wireless";
ptr.section = section;
ptr.option = option;

ret = uci_delete(ctx,&ptr);

uci_save(ctx, pkg);
uci_commit(ctx, &pkg, false);
uci_unload(ctx, pkg);
uci_free_context(ctx);
return 0;

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

修改节点中option的值

/*
*修改节点option值
*/
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(); //申请一个uci上下文
if(ctx==NULL)
{
snprintf(err_msg, sizeof(err_msg),"Failed to alloc uci context");
return -1;
}
}

ret = uci_load(ctx, "wireless", &pkg);
if(ret !=0 || pkg == NULL)
{
snprintf(err_msg, sizeof(err_msg),"Failed to load package: '%s' with error","/etc/config/wireless");
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 = "wireless";
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);
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;
}

好了，简单的总结一下，如果有问题可以留言，大家共同探讨！