Net-SNMP isn't able to handle double byte characters like UTF-8.
Though it can handle single byte characters (US-ASCII characters) properly,
UTF-8 and ShiftJIS characters are displays as "........."
Steps to Reproduce:
- Edit /etc/snmp/snmptrapd.conf and add or uncomment the following line.
authCommunity log,execute,net public
Start snmptrapd service.
# systemctl start snmptrapd
Run following command.
# snmptrap -v 2c -c public localhost '' .1.3.6.1.4.1.8072.2.1.3
.1.3.6.1.4.1.8072.2.1.3 s "データ"
Check the /var/log/messages or journalctl
Following patch brings support for double byte characters (UTF-8).
All comments are welcome.
---
diff -urNp old/snmplib/mib.c new/snmplib/mib.c
--- old/snmplib/mib.c 2017-10-18 09:47:39.345569965 +0200
+++ new/snmplib/mib.c 2017-10-18 14:05:11.237452328 +0200
@@ -370,7 +371,31 @@ sprint_realloc_hexstring(u_char ** buf,
return 1;
}
+/**
+ * Check, if given character contains value specific for UTF-8 encoding.
+ *
+ * @param cp character to check
+ *
+ * @return 0 on failure, 2 for two-byte character, 3 for three-byte character
+ * and 4 for four-byte character
+ */
+int
+isUTF8MultiByte(const u_char cp)
+{
+ if(cp >= 0xC2 && cp <= 0xDF){
+ return 2;
+ }
+
+ if(cp >= 0xE0 && cp <= 0xEF){
+ return 3;
+ }
+ if(cp >= 0xF2 && cp <= 0xFF){
+ return 4;
+ }
+
+ return 0;
+}
/**
* Prints an ascii string into a buffer.
@@ -396,22 +421,36 @@ sprint_realloc_asciistring(u_char ** buf
size_t * out_len, int allow_realloc,
const u_char * cp, size_t len)
{
- int i;
+ int i, j, multibyte;
for (i = 0; i < (int) len; i++) {
- if (isprint(*cp) || isspace(*cp)) {
- if (*cp == '\\' || *cp == '"') {
+ if (isprint(*cp) || isspace(*cp) || isUTF8MultiByte(*cp) > 0) {
+
+ multibyte = isUTF8MultiByte(*cp);
+
+ if(multibyte > 0){
+ for(j = 0; j < multibyte; j++, i++) {
+ if ((*out_len >= *buf_len) &&
+ !(allow_realloc && snmp_realloc(buf, buf_len))) {
+ return 0;
+ }
+ *(*buf + (*out_len)++) = *cp++;
+
+ }
+ } else {
+ if (*cp == '\\' || *cp == '"') {
+ if ((*out_len >= *buf_len) &&
+ !(allow_realloc && snmp_realloc(buf, buf_len))) {
+ return 0;
+ }
+ *(*buf + (*out_len)++) = '\\';
+ }
if ((*out_len >= *buf_len) &&
!(allow_realloc && snmp_realloc(buf, buf_len))) {
return 0;
}
- *(*buf + (*out_len)++) = '\\';
- }
- if ((*out_len >= *buf_len) &&
- !(allow_realloc && snmp_realloc(buf, buf_len))) {
- return 0;
+ *(*buf + (*out_len)++) = *cp++;
}
- *(*buf + (*out_len)++) = *cp++;
} else {
if ((*out_len >= *buf_len) &&
!(allow_realloc && snmp_realloc(buf, buf_len))) {
---
Regards
Josef Ridky
Associate Software Engineer
Core Services Team
Red Hat Czech, s.r.o.
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