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X509_NAME_get_index_by_NID.3
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The \&\fBX509_NAME\fR structure is the same as the \fBName\fR type defined in \&\s-1RFC2459\s0 (and elsewhere) and used for example in certificate subject and issuer names. .PP \&\fIX509_NAME_get_index_by_NID()\fR and \fIX509_NAME_get_index_by_OBJ()\fR retrieve the next index matching \fBnid\fR or \fBobj\fR after \fBlastpos\fR. \fBlastpos\fR should initially be set to \-1. If there are no more entries \-1 is returned. If \fBnid\fR is invalid (doesn't correspond to a valid \s-1OID\s0) then \-2 is returned. .PP \&\fIX509_NAME_entry_count()\fR returns the total number of entries in \fBname\fR. .PP \&\fIX509_NAME_get_entry()\fR retrieves the \fBX509_NAME_ENTRY\fR from \fBname\fR corresponding to index \fBloc\fR. Acceptable values for \fBloc\fR run from 0 to (X509_NAME_entry_count(name) \- 1). The value returned is an internal pointer which must not be freed. .PP \&\fIX509_NAME_get_text_by_NID()\fR, \fIX509_NAME_get_text_by_OBJ()\fR retrieve the \*(L"text\*(R" from the first entry in \fBname\fR which matches \fBnid\fR or \&\fBobj\fR, if no such entry exists \-1 is returned. At most \fBlen\fR bytes will be written and the text written to \fBbuf\fR will be null terminated. The length of the output string written is returned excluding the terminating null. If \fBbuf\fR is <\s-1NULL\s0> then the amount of space needed in \fBbuf\fR (excluding the final null) is returned. .SH "NOTES" .IX Header "NOTES" \&\fIX509_NAME_get_text_by_NID()\fR and \fIX509_NAME_get_text_by_OBJ()\fR are legacy functions which have various limitations which make them of minimal use in practice. They can only find the first matching entry and will copy the contents of the field verbatim: this can be highly confusing if the target is a muticharacter string type like a BMPString or a UTF8String. .PP For a more general solution \fIX509_NAME_get_index_by_NID()\fR or \&\fIX509_NAME_get_index_by_OBJ()\fR should be used followed by \&\fIX509_NAME_get_entry()\fR on any matching indices and then the various \fBX509_NAME_ENTRY\fR utility functions on the result. .PP The list of all relevant \fBNID_*\fR and \fBOBJ_* codes\fR can be found in the source code header files <openssl/obj_mac.h> and/or <openssl/objects.h>. .PP Applications which could pass invalid NIDs to \fIX509_NAME_get_index_by_NID()\fR should check for the return value of \-2. Alternatively the \s-1NID\s0 validity can be determined first by checking OBJ_nid2obj(nid) is not \s-1NULL\s0. .SH "EXAMPLES" .IX Header "EXAMPLES" Process all entries: .PP .Vb 2 \& int i; \& X509_NAME_ENTRY *e; .Ve .PP .Vb 5 \& for (i = 0; i < X509_NAME_entry_count(nm); i++) \& { \& e = X509_NAME_get_entry(nm, i); \& /* Do something with e */ \& } .Ve .PP Process all commonName entries: .PP .Vb 2 \& int lastpos = -1; \& X509_NAME_ENTRY *e; .Ve .PP .Vb 8 \& for (;;) \& { \& lastpos = X509_NAME_get_index_by_NID(nm, NID_commonName, lastpos); \& if (lastpos == -1) \& break; \& e = X509_NAME_get_entry(nm, lastpos); \& /* Do something with e */ \& } .Ve .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fIX509_NAME_get_index_by_NID()\fR and \fIX509_NAME_get_index_by_OBJ()\fR return the index of the next matching entry or \-1 if not found. \&\fIX509_NAME_get_index_by_NID()\fR can also return \-2 if the supplied \&\s-1NID\s0 is invalid. .PP \&\fIX509_NAME_entry_count()\fR returns the total number of entries. .PP \&\fIX509_NAME_get_entry()\fR returns an \fBX509_NAME\fR pointer to the requested entry or \fB\s-1NULL\s0\fR if the index is invalid. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fIERR_get_error\fR\|(3), \fId2i_X509_NAME\fR\|(3) .SH "HISTORY" .IX Header "HISTORY" \&\s-1TBA\s0