1diff --git a/src/lib/ares_init.c b/src/lib/ares_init.c 2index e8902c6..3a5a5f5 100644 3--- a/src/lib/ares_init.c 4+++ b/src/lib/ares_init.c 5@@ -58,6 +58,64 @@ 6 #undef WIN32 /* Redefined in MingW/MSVC headers */ 7 #endif 8 9+ 10+#if OHOS_DNS_PROXY_BY_NETSYS 11+#include <dlfcn.h> 12+#include <stdio.h> 13+ 14+#if DNS_CONFIG_DEBUG 15+#ifndef DNS_CONFIG_PRINT 16+#define DNS_CONFIG_PRINT(fmt, ...) printf("DNS " fmt "\n", ##__VA_ARGS__) 17+#endif 18+#else 19+#define DNS_CONFIG_PRINT(fmt, ...) 20+#endif 21+ 22+#define DNS_SO_PATH "libnetsys_client.z.so" 23+#define OHOS_GET_CONFIG_FUNC_NAME "NetSysGetResolvConf" 24+#define MAX_SERVER_NUM 4 25+#define MAX_SERVER_LENGTH 50 26+ 27+struct resolv_config { 28+ int32_t error; 29+ int32_t timeout_ms; 30+ uint32_t retry_count; 31+ char nameservers[MAX_SERVER_NUM][MAX_SERVER_LENGTH + 1]; 32+}; 33+ 34+typedef int32_t (*GetConfig)(uint16_t netId, struct resolv_config *config); 35+ 36+static void *open_dns_lib(void) 37+{ 38+ static void *lib = NULL; 39+ if (lib != NULL) { 40+ return lib; 41+ } 42+ lib = dlopen(DNS_SO_PATH, RTLD_LAZY); 43+ if (lib == NULL) { 44+ DNS_CONFIG_PRINT("%s: dlopen %s failed: %s", 45+ __func__, DNS_SO_PATH, dlerror()); 46+ return NULL; 47+ } 48+ return lib; 49+} 50+ 51+static void *load_from_dns_lib(const char *symbol) 52+{ 53+ void *lib_handle = open_dns_lib(); 54+ if (lib_handle == NULL) { 55+ return NULL; 56+ } 57+ 58+ void *sym_addr = dlsym(lib_handle, symbol); 59+ if (sym_addr == NULL) { 60+ DNS_CONFIG_PRINT("%s: loading symbol %s with dlsym failed: %s", 61+ __func__, symbol, dlerror()); 62+ } 63+ return sym_addr; 64+} 65+#endif 66+ 67 static int init_by_options(ares_channel channel, 68 const struct ares_options *options, 69 int optmask); 70@@ -1705,6 +1763,12 @@ static int init_by_resolv_conf(ares_channel channel) 71 int error; 72 int update_domains; 73 const char *resolvconf_path; 74+#if OHOS_DNS_PROXY_BY_NETSYS 75+ int netid = 0; 76+ int ret = 0; 77+ int status_each = -1; 78+ GetConfig func = NULL; 79+#endif 80 81 /* Don't read resolv.conf and friends if we don't have to */ 82 if (ARES_CONFIG_CHECK(channel)) 83@@ -1720,6 +1784,36 @@ static int init_by_resolv_conf(ares_channel channel) 84 resolvconf_path = PATH_RESOLV_CONF; 85 } 86 87+#if OHOS_DNS_PROXY_BY_NETSYS 88+ *(void **) &func = load_from_dns_lib(OHOS_GET_CONFIG_FUNC_NAME); 89+ if (!func) { 90+ DNS_CONFIG_PRINT("%s: loading %s failed, use %s as a fallback", 91+ __func__, OHOS_GET_CONFIG_FUNC_NAME, DNS_RESOLV_CONF_PATH); 92+ goto etc_resolv_conf; 93+ } 94+ struct resolv_config config = {0}; 95+ ret = func(netid, &config); 96+ if (ret < 0) { 97+ DNS_CONFIG_PRINT("__get_resolv_conf OHOS_GET_CONFIG_FUNC_NAME err %d\n", ret); 98+ return ARES_ENONAME; 99+ } 100+ 101+ for (int i = 0; i < MAX_SERVER_NUM; ++i) { 102+ if (config.nameservers[i] == NULL || config.nameservers[i][0] == 0) { 103+ continue; 104+ } 105+ status_each = config_nameserver(&servers, &nservers, config.nameservers[i]); 106+ if (status_each == ARES_SUCCESS) { 107+ status = ARES_SUCCESS; 108+ } 109+ } 110+ 111+ if (status == ARES_SUCCESS && nservers > 0) { 112+ goto get_conf_ok; 113+ } 114+ 115+etc_resolv_conf: 116+#endif 117 fp = fopen(resolvconf_path, "r"); 118 if (fp) { 119 while ((status = ares__read_line(fp, &line, &linesize)) == ARES_SUCCESS) 120@@ -1866,7 +1960,9 @@ static int init_by_resolv_conf(ares_channel channel) 121 ares_free(sortlist); 122 return status; 123 } 124- 125+#if OHOS_DNS_PROXY_BY_NETSYS 126+get_conf_ok: 127+#endif 128 /* If we got any name server entries, fill them in. */ 129 if (servers) 130 { 131