From c8c9f0bafbf42e5ea74c74e51318435749005260 Mon Sep 17 00:00:00 2001
From: u5surf <u5.horie@gmail.com>
Date: Fri, 7 Feb 2025 20:58:18 +0900
Subject: [PATCH] Add variables for ISO8601 format for ssl_client_v_start/end
 #477

---
 src/core/ngx_core.h           |  2 +-
 src/event/ngx_event_openssl.c | 34 ++++++++++++++++++++++++++++++++++
 2 files changed, 35 insertions(+), 1 deletion(-)

diff --git a/src/core/ngx_core.h b/src/core/ngx_core.h
index 02890b843..34960757e 100644
--- a/src/core/ngx_core.h
+++ b/src/core/ngx_core.h
@@ -104,7 +104,7 @@ typedef void (*ngx_connection_handler_pt)(ngx_connection_t *c);
 #define LF     (u_char) '\n'
 #define CR     (u_char) '\r'
 #define CRLF   "\r\n"
-
+#define ngx_ascii_is_digit(c) (c >= 0x30 && c <= 0x39)
 
 #define ngx_abs(value)       (((value) >= 0) ? (value) : - (value))
 #define ngx_max(val1, val2)  ((val1 < val2) ? (val2) : (val1))
diff --git a/src/event/ngx_event_openssl.c b/src/event/ngx_event_openssl.c
index 0681ca3a2..f5f8ff5a8 100644
--- a/src/event/ngx_event_openssl.c
+++ b/src/event/ngx_event_openssl.c
@@ -5755,6 +5755,40 @@ ngx_ssl_get_client_v_start(ngx_connection_t *c, ngx_pool_t *pool, ngx_str_t *s)
     return NGX_OK;
 }
 
+ngx_int_t
+ngx_ssl_print_time(BIO *bio, ASN1_TIME *tm, long flag)
+{
+    ngx_int_t ret;
+    struct tm stm;
+    const char period = 0x2E;
+    int l, f_len;
+    char *v, *f;
+ 
+    ret = ASN1_TIME_to_tm(tm, &stm);
+    if (ret != NGX_OK) {
+        return ret;
+    }
+
+    l = tm->length;
+    v = (char *)tm->data;
+    f = NULL;
+    f_len = 0;
+
+    if (tm->length > 15 && v[14] == period) {
+        f = &v[15];
+        while(15 + f_len < l && ngx_ascii_is_digit(f[f_len]))
+            ++f_len;
+    }
+    if (flag) {
+        BIO_printf(bio, "%4d-%02d-%02d %02d:%02d:%02d.%.*sZ",
+             stm.tm_year + 1900, stm.tm_mon + 1,
+             stm.tm_mday, stm.tm_hour,
+             stm.tm_min, stm.tm_sec, f_len, f);
+    } else {
+        ASN1_TIME_print(bio, tm);
+    }
+    return NGX_OK;
+}
 
 ngx_int_t
 ngx_ssl_get_client_v_end(ngx_connection_t *c, ngx_pool_t *pool, ngx_str_t *s)