diff --git a/conf/log.toml b/conf/log.toml
index 64b5fea..a51abd8 100644
--- a/conf/log.toml
+++ b/conf/log.toml
@@ -1,4 +1,4 @@
 [log]
-output = file      # stderr, file
-file   = "log/stellar.log"
-level  = FATAL       # TRACE, DEBUG, INFO, WARN, ERROR, FATAL
+output = "stderr"        # stderr, file
+file = "log/stellar.log"
+level = "ERROR"          # TRACE, DEBUG, INFO, WARN, ERROR, FATAL
diff --git a/conf/stellar.toml b/conf/stellar.toml
index 275294a..708acc0 100644
--- a/conf/stellar.toml
+++ b/conf/stellar.toml
@@ -3,9 +3,9 @@ snowflake_base = 1   # [0, 31]
 snowflake_offset = 2 # [0, 127]
 
 [packet_io]
-mode = dumpfile                        # dumpfile, dumpfilelist, marsio
-app_symbol = stellar
-dev_symbol = nf_0_fw
+mode = "dumpfile"      # dumpfile, dumpfilelist, marsio
+app_symbol = "stellar"
+dev_symbol = "nf_0_fw"
 
 dumpfile_path = "/tmp/dumpfile/dumpfile.pcap"
 #dumpfile_path = "/tmp/dumpfile/dumpfilelist"
diff --git a/src/core/stellar_config.cpp b/src/core/stellar_config.cpp
index 15806cb..f30c1a8 100644
--- a/src/core/stellar_config.cpp
+++ b/src/core/stellar_config.cpp
@@ -46,6 +46,7 @@ static int parse_snowflake_section(toml_table_t *root, struct snowflake_options
 // retuun -1: failed
 static int parse_packet_io_section(toml_table_t *root, struct packet_io_options *opts)
 {
+    char *temp;
     const char *ptr;
     toml_table_t *table;
     toml_array_t *mask_array;
@@ -58,20 +59,21 @@ static int parse_packet_io_section(toml_table_t *root, struct packet_io_options
     }
 
     ptr = toml_raw_in(table, "mode");
-    if (ptr == NULL)
+    temp = NULL;
+    if (ptr == NULL || toml_rtos(ptr, &temp) != 0)
     {
         CONFIG_LOG_ERROR("config file missing packet_io->mode");
         return -1;
     }
-    if (strcmp(ptr, "dumpfile") == 0)
+    if (strcmp(temp, "dumpfile") == 0)
     {
         opts->mode = PACKET_IO_DUMPFILE;
     }
-    else if (strcmp(ptr, "dumpfilelist") == 0)
+    else if (strcmp(temp, "dumpfilelist") == 0)
     {
         opts->mode = PACKET_IO_DUMPFILELIST;
     }
-    else if (strcmp(ptr, "marsio") == 0)
+    else if (strcmp(temp, "marsio") == 0)
     {
         opts->mode = PACKET_IO_MARSIO;
     }
@@ -84,31 +86,33 @@ static int parse_packet_io_section(toml_table_t *root, struct packet_io_options
     if (opts->mode == PACKET_IO_DUMPFILE || opts->mode == PACKET_IO_DUMPFILELIST)
     {
         ptr = toml_raw_in(table, "dumpfile_path");
-        if (ptr == NULL)
+        temp = NULL;
+        if (ptr == NULL || toml_rtos(ptr, &temp) != 0)
         {
             CONFIG_LOG_ERROR("config file missing packet_io->dumpfile_path");
             return -1;
         }
-        // skip ""
-        strncpy(opts->dumpfile_path, ptr + 1, strlen(ptr) - 2);
+        strcpy(opts->dumpfile_path, temp);
     }
     else
     {
         ptr = toml_raw_in(table, "app_symbol");
-        if (ptr == NULL)
+        temp = NULL;
+        if (ptr == NULL || toml_rtos(ptr, &temp) != 0)
         {
             CONFIG_LOG_ERROR("config file missing packet_io->app_symbol");
             return -1;
         }
-        strncpy(opts->app_symbol, ptr, sizeof(opts->app_symbol) - 1);
+        strcpy(opts->app_symbol, temp);
 
         ptr = toml_raw_in(table, "dev_symbol");
-        if (ptr == NULL)
+        temp = NULL;
+        if (ptr == NULL || toml_rtos(ptr, &temp) != 0)
         {
             CONFIG_LOG_ERROR("config file missing packet_io->dev_symbol");
             return -1;
         }
-        strncpy(opts->dev_symbol, ptr, sizeof(opts->dev_symbol) - 1);
+        strcpy(opts->dev_symbol, temp);
     }
 
     ptr = toml_raw_in(table, "nr_threads");
diff --git a/src/log/log.cpp b/src/log/log.cpp
index 7ed4ab2..a72e498 100644
--- a/src/log/log.cpp
+++ b/src/log/log.cpp
@@ -99,6 +99,7 @@ static int parse_config(struct log_config *config, const char *cfg_file)
     int ret = -1;
     FILE *fp = NULL;
     char errbuf[200];
+    char *temp;
     const char *ptr;
     toml_table_t *log_section = NULL;
     toml_table_t *conf_table = NULL;
@@ -126,16 +127,17 @@ static int parse_config(struct log_config *config, const char *cfg_file)
 
     // output
     ptr = toml_raw_in(log_section, "output");
-    if (ptr == NULL)
+    temp = NULL;
+    if (ptr == NULL || toml_rtos(ptr, &temp) != 0)
     {
         fprintf(stderr, "config file %s missing log.output\n", cfg_file);
         goto error_out;
     }
-    if (strcasecmp(ptr, "stderr") == 0)
+    if (strcasecmp(temp, "stderr") == 0)
     {
         config->output = LOG_OUTPUT_STDERR;
     }
-    else if (strcasecmp(ptr, "file") == 0)
+    else if (strcasecmp(temp, "file") == 0)
     {
         config->output = LOG_OUTPUT_FILE;
     }
@@ -149,23 +151,24 @@ static int parse_config(struct log_config *config, const char *cfg_file)
     if (config->output == LOG_OUTPUT_FILE)
     {
         ptr = toml_raw_in(log_section, "file");
-        if (ptr == NULL)
+        temp = NULL;
+        if (ptr == NULL || toml_rtos(ptr, &temp) != 0)
         {
             fprintf(stderr, "config file %s missing log.file\n", cfg_file);
             goto error_out;
         }
-        // skip ""
-        strncpy(config->log_file, ptr + 1, strlen(ptr) - 2);
+        strcpy(config->log_file, temp);
     }
 
     // level
     ptr = toml_raw_in(log_section, "level");
-    if (ptr == NULL)
+    temp = NULL;
+    if (ptr == NULL || toml_rtos(ptr, &temp) != 0)
     {
         fprintf(stderr, "config file %s missing log.level\n", cfg_file);
         goto error_out;
     }
-    config->level = check_level(ptr);
+    config->level = check_level(temp);
     if (config->level == LOG_NONE)
     {
         fprintf(stderr, "config file %s invalid log.level\n", cfg_file);
diff --git a/src/log/test/conf/log_file.toml b/src/log/test/conf/log_file.toml
index f423a38..f604db0 100644
--- a/src/log/test/conf/log_file.toml
+++ b/src/log/test/conf/log_file.toml
@@ -1,4 +1,4 @@
 [log]
-output = file        # stderr, file
-file   = stellar.log
-level  = DEBUG       # TRACE, DEBUG, INFO, WARN, ERROR, FATAL
+output = "file"      # stderr, file
+file = "stellar.log"
+level = "DEBUG"      # TRACE, DEBUG, INFO, WARN, ERROR, FATAL
diff --git a/src/log/test/conf/log_stderr.toml b/src/log/test/conf/log_stderr.toml
index dda2a3d..59813c9 100644
--- a/src/log/test/conf/log_stderr.toml
+++ b/src/log/test/conf/log_stderr.toml
@@ -1,4 +1,4 @@
 [log]
-output = stderr      # stderr, file
-file   = stellar.log
-level  = DEBUG       # TRACE, DEBUG, INFO, WARN, ERROR, FATAL
+output = "stderr"    # stderr, file
+file = "stellar.log"
+level = "DEBUG"      # TRACE, DEBUG, INFO, WARN, ERROR, FATAL
diff --git a/test/packet_inject/conf/log.toml b/test/packet_inject/conf/log.toml
index 8f155c0..a50d2f5 100644
--- a/test/packet_inject/conf/log.toml
+++ b/test/packet_inject/conf/log.toml
@@ -1,4 +1,4 @@
 [log]
-output = stderr      # stderr, file
-level  = DEBUG       # TRACE, DEBUG, INFO, WARN, ERROR, FATAL
+output = "stderr"        # stderr, file
+level = "DEBUG"          # TRACE, DEBUG, INFO, WARN, ERROR, FATAL
 file = "log/stellar.log"
diff --git a/test/packet_inject/conf/stellar.toml b/test/packet_inject/conf/stellar.toml
index d200ceb..9a98991 100644
--- a/test/packet_inject/conf/stellar.toml
+++ b/test/packet_inject/conf/stellar.toml
@@ -3,9 +3,9 @@ snowflake_base = 1   # [0, 31]
 snowflake_offset = 2 # [0, 127]
 
 [packet_io]
-mode = marsio                        # dumpfile, dumpfilelist, marsio
-app_symbol = stellar
-dev_symbol = nf_0_fw
+mode = "dumpfile"      # dumpfile, dumpfilelist, marsio
+app_symbol = "stellar"
+dev_symbol = "nf_0_fw"
 
 dumpfile_path = "/tmp/dumpfile/dumpfile.pcap"
 #dumpfile_path = "/tmp/dumpfile/dumpfilelist"