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-rw-r--r--app/nginx/src/mail/ngx_mail_parse.c932
1 files changed, 932 insertions, 0 deletions
diff --git a/app/nginx/src/mail/ngx_mail_parse.c b/app/nginx/src/mail/ngx_mail_parse.c
new file mode 100644
index 0000000..2c2cdff
--- /dev/null
+++ b/app/nginx/src/mail/ngx_mail_parse.c
@@ -0,0 +1,932 @@
+
+/*
+ * Copyright (C) Igor Sysoev
+ * Copyright (C) Nginx, Inc.
+ */
+
+
+#include <ngx_config.h>
+#include <ngx_core.h>
+#include <ngx_event.h>
+#include <ngx_mail.h>
+#include <ngx_mail_pop3_module.h>
+#include <ngx_mail_imap_module.h>
+#include <ngx_mail_smtp_module.h>
+
+
+ngx_int_t
+ngx_mail_pop3_parse_command(ngx_mail_session_t *s)
+{
+ u_char ch, *p, *c, c0, c1, c2, c3;
+ ngx_str_t *arg;
+ enum {
+ sw_start = 0,
+ sw_spaces_before_argument,
+ sw_argument,
+ sw_almost_done
+ } state;
+
+ state = s->state;
+
+ for (p = s->buffer->pos; p < s->buffer->last; p++) {
+ ch = *p;
+
+ switch (state) {
+
+ /* POP3 command */
+ case sw_start:
+ if (ch == ' ' || ch == CR || ch == LF) {
+ c = s->buffer->start;
+
+ if (p - c == 4) {
+
+ c0 = ngx_toupper(c[0]);
+ c1 = ngx_toupper(c[1]);
+ c2 = ngx_toupper(c[2]);
+ c3 = ngx_toupper(c[3]);
+
+ if (c0 == 'U' && c1 == 'S' && c2 == 'E' && c3 == 'R')
+ {
+ s->command = NGX_POP3_USER;
+
+ } else if (c0 == 'P' && c1 == 'A' && c2 == 'S' && c3 == 'S')
+ {
+ s->command = NGX_POP3_PASS;
+
+ } else if (c0 == 'A' && c1 == 'P' && c2 == 'O' && c3 == 'P')
+ {
+ s->command = NGX_POP3_APOP;
+
+ } else if (c0 == 'Q' && c1 == 'U' && c2 == 'I' && c3 == 'T')
+ {
+ s->command = NGX_POP3_QUIT;
+
+ } else if (c0 == 'C' && c1 == 'A' && c2 == 'P' && c3 == 'A')
+ {
+ s->command = NGX_POP3_CAPA;
+
+ } else if (c0 == 'A' && c1 == 'U' && c2 == 'T' && c3 == 'H')
+ {
+ s->command = NGX_POP3_AUTH;
+
+ } else if (c0 == 'N' && c1 == 'O' && c2 == 'O' && c3 == 'P')
+ {
+ s->command = NGX_POP3_NOOP;
+#if (NGX_MAIL_SSL)
+ } else if (c0 == 'S' && c1 == 'T' && c2 == 'L' && c3 == 'S')
+ {
+ s->command = NGX_POP3_STLS;
+#endif
+ } else {
+ goto invalid;
+ }
+
+ } else {
+ goto invalid;
+ }
+
+ switch (ch) {
+ case ' ':
+ state = sw_spaces_before_argument;
+ break;
+ case CR:
+ state = sw_almost_done;
+ break;
+ case LF:
+ goto done;
+ }
+ break;
+ }
+
+ if ((ch < 'A' || ch > 'Z') && (ch < 'a' || ch > 'z')) {
+ goto invalid;
+ }
+
+ break;
+
+ case sw_spaces_before_argument:
+ switch (ch) {
+ case ' ':
+ break;
+ case CR:
+ state = sw_almost_done;
+ s->arg_end = p;
+ break;
+ case LF:
+ s->arg_end = p;
+ goto done;
+ default:
+ if (s->args.nelts <= 2) {
+ state = sw_argument;
+ s->arg_start = p;
+ break;
+ }
+ goto invalid;
+ }
+ break;
+
+ case sw_argument:
+ switch (ch) {
+
+ case ' ':
+
+ /*
+ * the space should be considered as part of the at username
+ * or password, but not of argument in other commands
+ */
+
+ if (s->command == NGX_POP3_USER
+ || s->command == NGX_POP3_PASS)
+ {
+ break;
+ }
+
+ /* fall through */
+
+ case CR:
+ case LF:
+ arg = ngx_array_push(&s->args);
+ if (arg == NULL) {
+ return NGX_ERROR;
+ }
+ arg->len = p - s->arg_start;
+ arg->data = s->arg_start;
+ s->arg_start = NULL;
+
+ switch (ch) {
+ case ' ':
+ state = sw_spaces_before_argument;
+ break;
+ case CR:
+ state = sw_almost_done;
+ break;
+ case LF:
+ goto done;
+ }
+ break;
+
+ default:
+ break;
+ }
+ break;
+
+ case sw_almost_done:
+ switch (ch) {
+ case LF:
+ goto done;
+ default:
+ goto invalid;
+ }
+ }
+ }
+
+ s->buffer->pos = p;
+ s->state = state;
+
+ return NGX_AGAIN;
+
+done:
+
+ s->buffer->pos = p + 1;
+
+ if (s->arg_start) {
+ arg = ngx_array_push(&s->args);
+ if (arg == NULL) {
+ return NGX_ERROR;
+ }
+ arg->len = s->arg_end - s->arg_start;
+ arg->data = s->arg_start;
+ s->arg_start = NULL;
+ }
+
+ s->state = (s->command != NGX_POP3_AUTH) ? sw_start : sw_argument;
+
+ return NGX_OK;
+
+invalid:
+
+ s->state = sw_start;
+ s->arg_start = NULL;
+
+ return NGX_MAIL_PARSE_INVALID_COMMAND;
+}
+
+
+ngx_int_t
+ngx_mail_imap_parse_command(ngx_mail_session_t *s)
+{
+ u_char ch, *p, *c;
+ ngx_str_t *arg;
+ enum {
+ sw_start = 0,
+ sw_spaces_before_command,
+ sw_command,
+ sw_spaces_before_argument,
+ sw_argument,
+ sw_backslash,
+ sw_literal,
+ sw_no_sync_literal_argument,
+ sw_start_literal_argument,
+ sw_literal_argument,
+ sw_end_literal_argument,
+ sw_almost_done
+ } state;
+
+ state = s->state;
+
+ for (p = s->buffer->pos; p < s->buffer->last; p++) {
+ ch = *p;
+
+ switch (state) {
+
+ /* IMAP tag */
+ case sw_start:
+ switch (ch) {
+ case ' ':
+ s->tag.len = p - s->buffer->start + 1;
+ s->tag.data = s->buffer->start;
+ state = sw_spaces_before_command;
+ break;
+ case CR:
+ s->state = sw_start;
+ return NGX_MAIL_PARSE_INVALID_COMMAND;
+ case LF:
+ s->state = sw_start;
+ return NGX_MAIL_PARSE_INVALID_COMMAND;
+ }
+ break;
+
+ case sw_spaces_before_command:
+ switch (ch) {
+ case ' ':
+ break;
+ case CR:
+ s->state = sw_start;
+ return NGX_MAIL_PARSE_INVALID_COMMAND;
+ case LF:
+ s->state = sw_start;
+ return NGX_MAIL_PARSE_INVALID_COMMAND;
+ default:
+ s->cmd_start = p;
+ state = sw_command;
+ break;
+ }
+ break;
+
+ case sw_command:
+ if (ch == ' ' || ch == CR || ch == LF) {
+
+ c = s->cmd_start;
+
+ switch (p - c) {
+
+ case 4:
+ if ((c[0] == 'N' || c[0] == 'n')
+ && (c[1] == 'O'|| c[1] == 'o')
+ && (c[2] == 'O'|| c[2] == 'o')
+ && (c[3] == 'P'|| c[3] == 'p'))
+ {
+ s->command = NGX_IMAP_NOOP;
+
+ } else {
+ goto invalid;
+ }
+ break;
+
+ case 5:
+ if ((c[0] == 'L'|| c[0] == 'l')
+ && (c[1] == 'O'|| c[1] == 'o')
+ && (c[2] == 'G'|| c[2] == 'g')
+ && (c[3] == 'I'|| c[3] == 'i')
+ && (c[4] == 'N'|| c[4] == 'n'))
+ {
+ s->command = NGX_IMAP_LOGIN;
+
+ } else {
+ goto invalid;
+ }
+ break;
+
+ case 6:
+ if ((c[0] == 'L'|| c[0] == 'l')
+ && (c[1] == 'O'|| c[1] == 'o')
+ && (c[2] == 'G'|| c[2] == 'g')
+ && (c[3] == 'O'|| c[3] == 'o')
+ && (c[4] == 'U'|| c[4] == 'u')
+ && (c[5] == 'T'|| c[5] == 't'))
+ {
+ s->command = NGX_IMAP_LOGOUT;
+
+ } else {
+ goto invalid;
+ }
+ break;
+
+#if (NGX_MAIL_SSL)
+ case 8:
+ if ((c[0] == 'S'|| c[0] == 's')
+ && (c[1] == 'T'|| c[1] == 't')
+ && (c[2] == 'A'|| c[2] == 'a')
+ && (c[3] == 'R'|| c[3] == 'r')
+ && (c[4] == 'T'|| c[4] == 't')
+ && (c[5] == 'T'|| c[5] == 't')
+ && (c[6] == 'L'|| c[6] == 'l')
+ && (c[7] == 'S'|| c[7] == 's'))
+ {
+ s->command = NGX_IMAP_STARTTLS;
+
+ } else {
+ goto invalid;
+ }
+ break;
+#endif
+
+ case 10:
+ if ((c[0] == 'C'|| c[0] == 'c')
+ && (c[1] == 'A'|| c[1] == 'a')
+ && (c[2] == 'P'|| c[2] == 'p')
+ && (c[3] == 'A'|| c[3] == 'a')
+ && (c[4] == 'B'|| c[4] == 'b')
+ && (c[5] == 'I'|| c[5] == 'i')
+ && (c[6] == 'L'|| c[6] == 'l')
+ && (c[7] == 'I'|| c[7] == 'i')
+ && (c[8] == 'T'|| c[8] == 't')
+ && (c[9] == 'Y'|| c[9] == 'y'))
+ {
+ s->command = NGX_IMAP_CAPABILITY;
+
+ } else {
+ goto invalid;
+ }
+ break;
+
+ case 12:
+ if ((c[0] == 'A'|| c[0] == 'a')
+ && (c[1] == 'U'|| c[1] == 'u')
+ && (c[2] == 'T'|| c[2] == 't')
+ && (c[3] == 'H'|| c[3] == 'h')
+ && (c[4] == 'E'|| c[4] == 'e')
+ && (c[5] == 'N'|| c[5] == 'n')
+ && (c[6] == 'T'|| c[6] == 't')
+ && (c[7] == 'I'|| c[7] == 'i')
+ && (c[8] == 'C'|| c[8] == 'c')
+ && (c[9] == 'A'|| c[9] == 'a')
+ && (c[10] == 'T'|| c[10] == 't')
+ && (c[11] == 'E'|| c[11] == 'e'))
+ {
+ s->command = NGX_IMAP_AUTHENTICATE;
+
+ } else {
+ goto invalid;
+ }
+ break;
+
+ default:
+ goto invalid;
+ }
+
+ switch (ch) {
+ case ' ':
+ state = sw_spaces_before_argument;
+ break;
+ case CR:
+ state = sw_almost_done;
+ break;
+ case LF:
+ goto done;
+ }
+ break;
+ }
+
+ if ((ch < 'A' || ch > 'Z') && (ch < 'a' || ch > 'z')) {
+ goto invalid;
+ }
+
+ break;
+
+ case sw_spaces_before_argument:
+ switch (ch) {
+ case ' ':
+ break;
+ case CR:
+ state = sw_almost_done;
+ s->arg_end = p;
+ break;
+ case LF:
+ s->arg_end = p;
+ goto done;
+ case '"':
+ if (s->args.nelts <= 2) {
+ s->quoted = 1;
+ s->arg_start = p + 1;
+ state = sw_argument;
+ break;
+ }
+ goto invalid;
+ case '{':
+ if (s->args.nelts <= 2) {
+ state = sw_literal;
+ break;
+ }
+ goto invalid;
+ default:
+ if (s->args.nelts <= 2) {
+ s->arg_start = p;
+ state = sw_argument;
+ break;
+ }
+ goto invalid;
+ }
+ break;
+
+ case sw_argument:
+ if (ch == ' ' && s->quoted) {
+ break;
+ }
+
+ switch (ch) {
+ case '"':
+ if (!s->quoted) {
+ break;
+ }
+ s->quoted = 0;
+ /* fall through */
+ case ' ':
+ case CR:
+ case LF:
+ arg = ngx_array_push(&s->args);
+ if (arg == NULL) {
+ return NGX_ERROR;
+ }
+ arg->len = p - s->arg_start;
+ arg->data = s->arg_start;
+ s->arg_start = NULL;
+
+ switch (ch) {
+ case '"':
+ case ' ':
+ state = sw_spaces_before_argument;
+ break;
+ case CR:
+ state = sw_almost_done;
+ break;
+ case LF:
+ goto done;
+ }
+ break;
+ case '\\':
+ if (s->quoted) {
+ s->backslash = 1;
+ state = sw_backslash;
+ }
+ break;
+ }
+ break;
+
+ case sw_backslash:
+ switch (ch) {
+ case CR:
+ case LF:
+ goto invalid;
+ default:
+ state = sw_argument;
+ }
+ break;
+
+ case sw_literal:
+ if (ch >= '0' && ch <= '9') {
+ s->literal_len = s->literal_len * 10 + (ch - '0');
+ break;
+ }
+ if (ch == '}') {
+ state = sw_start_literal_argument;
+ break;
+ }
+ if (ch == '+') {
+ state = sw_no_sync_literal_argument;
+ break;
+ }
+ goto invalid;
+
+ case sw_no_sync_literal_argument:
+ if (ch == '}') {
+ s->no_sync_literal = 1;
+ state = sw_start_literal_argument;
+ break;
+ }
+ goto invalid;
+
+ case sw_start_literal_argument:
+ switch (ch) {
+ case CR:
+ break;
+ case LF:
+ s->buffer->pos = p + 1;
+ s->arg_start = p + 1;
+ if (s->no_sync_literal == 0) {
+ s->state = sw_literal_argument;
+ return NGX_IMAP_NEXT;
+ }
+ state = sw_literal_argument;
+ s->no_sync_literal = 0;
+ break;
+ default:
+ goto invalid;
+ }
+ break;
+
+ case sw_literal_argument:
+ if (s->literal_len && --s->literal_len) {
+ break;
+ }
+
+ arg = ngx_array_push(&s->args);
+ if (arg == NULL) {
+ return NGX_ERROR;
+ }
+ arg->len = p + 1 - s->arg_start;
+ arg->data = s->arg_start;
+ s->arg_start = NULL;
+ state = sw_end_literal_argument;
+
+ break;
+
+ case sw_end_literal_argument:
+ switch (ch) {
+ case '{':
+ if (s->args.nelts <= 2) {
+ state = sw_literal;
+ break;
+ }
+ goto invalid;
+ case CR:
+ state = sw_almost_done;
+ break;
+ case LF:
+ goto done;
+ default:
+ state = sw_spaces_before_argument;
+ break;
+ }
+ break;
+
+ case sw_almost_done:
+ switch (ch) {
+ case LF:
+ goto done;
+ default:
+ goto invalid;
+ }
+ }
+ }
+
+ s->buffer->pos = p;
+ s->state = state;
+
+ return NGX_AGAIN;
+
+done:
+
+ s->buffer->pos = p + 1;
+
+ if (s->arg_start) {
+ arg = ngx_array_push(&s->args);
+ if (arg == NULL) {
+ return NGX_ERROR;
+ }
+ arg->len = s->arg_end - s->arg_start;
+ arg->data = s->arg_start;
+
+ s->arg_start = NULL;
+ s->cmd_start = NULL;
+ s->quoted = 0;
+ s->no_sync_literal = 0;
+ s->literal_len = 0;
+ }
+
+ s->state = (s->command != NGX_IMAP_AUTHENTICATE) ? sw_start : sw_argument;
+
+ return NGX_OK;
+
+invalid:
+
+ s->state = sw_start;
+ s->quoted = 0;
+ s->no_sync_literal = 0;
+ s->literal_len = 0;
+
+ return NGX_MAIL_PARSE_INVALID_COMMAND;
+}
+
+
+ngx_int_t
+ngx_mail_smtp_parse_command(ngx_mail_session_t *s)
+{
+ u_char ch, *p, *c, c0, c1, c2, c3;
+ ngx_str_t *arg;
+ enum {
+ sw_start = 0,
+ sw_command,
+ sw_invalid,
+ sw_spaces_before_argument,
+ sw_argument,
+ sw_almost_done
+ } state;
+
+ state = s->state;
+
+ for (p = s->buffer->pos; p < s->buffer->last; p++) {
+ ch = *p;
+
+ switch (state) {
+
+ /* SMTP command */
+ case sw_start:
+ s->cmd_start = p;
+ state = sw_command;
+
+ /* fall through */
+
+ case sw_command:
+ if (ch == ' ' || ch == CR || ch == LF) {
+ c = s->cmd_start;
+
+ if (p - c == 4) {
+
+ c0 = ngx_toupper(c[0]);
+ c1 = ngx_toupper(c[1]);
+ c2 = ngx_toupper(c[2]);
+ c3 = ngx_toupper(c[3]);
+
+ if (c0 == 'H' && c1 == 'E' && c2 == 'L' && c3 == 'O')
+ {
+ s->command = NGX_SMTP_HELO;
+
+ } else if (c0 == 'E' && c1 == 'H' && c2 == 'L' && c3 == 'O')
+ {
+ s->command = NGX_SMTP_EHLO;
+
+ } else if (c0 == 'Q' && c1 == 'U' && c2 == 'I' && c3 == 'T')
+ {
+ s->command = NGX_SMTP_QUIT;
+
+ } else if (c0 == 'A' && c1 == 'U' && c2 == 'T' && c3 == 'H')
+ {
+ s->command = NGX_SMTP_AUTH;
+
+ } else if (c0 == 'N' && c1 == 'O' && c2 == 'O' && c3 == 'P')
+ {
+ s->command = NGX_SMTP_NOOP;
+
+ } else if (c0 == 'M' && c1 == 'A' && c2 == 'I' && c3 == 'L')
+ {
+ s->command = NGX_SMTP_MAIL;
+
+ } else if (c0 == 'R' && c1 == 'S' && c2 == 'E' && c3 == 'T')
+ {
+ s->command = NGX_SMTP_RSET;
+
+ } else if (c0 == 'R' && c1 == 'C' && c2 == 'P' && c3 == 'T')
+ {
+ s->command = NGX_SMTP_RCPT;
+
+ } else if (c0 == 'V' && c1 == 'R' && c2 == 'F' && c3 == 'Y')
+ {
+ s->command = NGX_SMTP_VRFY;
+
+ } else if (c0 == 'E' && c1 == 'X' && c2 == 'P' && c3 == 'N')
+ {
+ s->command = NGX_SMTP_EXPN;
+
+ } else if (c0 == 'H' && c1 == 'E' && c2 == 'L' && c3 == 'P')
+ {
+ s->command = NGX_SMTP_HELP;
+
+ } else {
+ goto invalid;
+ }
+#if (NGX_MAIL_SSL)
+ } else if (p - c == 8) {
+
+ if ((c[0] == 'S'|| c[0] == 's')
+ && (c[1] == 'T'|| c[1] == 't')
+ && (c[2] == 'A'|| c[2] == 'a')
+ && (c[3] == 'R'|| c[3] == 'r')
+ && (c[4] == 'T'|| c[4] == 't')
+ && (c[5] == 'T'|| c[5] == 't')
+ && (c[6] == 'L'|| c[6] == 'l')
+ && (c[7] == 'S'|| c[7] == 's'))
+ {
+ s->command = NGX_SMTP_STARTTLS;
+
+ } else {
+ goto invalid;
+ }
+#endif
+ } else {
+ goto invalid;
+ }
+
+ s->cmd.data = s->cmd_start;
+ s->cmd.len = p - s->cmd_start;
+
+ switch (ch) {
+ case ' ':
+ state = sw_spaces_before_argument;
+ break;
+ case CR:
+ state = sw_almost_done;
+ break;
+ case LF:
+ goto done;
+ }
+ break;
+ }
+
+ if ((ch < 'A' || ch > 'Z') && (ch < 'a' || ch > 'z')) {
+ goto invalid;
+ }
+
+ break;
+
+ case sw_invalid:
+ goto invalid;
+
+ case sw_spaces_before_argument:
+ switch (ch) {
+ case ' ':
+ break;
+ case CR:
+ state = sw_almost_done;
+ s->arg_end = p;
+ break;
+ case LF:
+ s->arg_end = p;
+ goto done;
+ default:
+ if (s->args.nelts <= 10) {
+ state = sw_argument;
+ s->arg_start = p;
+ break;
+ }
+ goto invalid;
+ }
+ break;
+
+ case sw_argument:
+ switch (ch) {
+ case ' ':
+ case CR:
+ case LF:
+ arg = ngx_array_push(&s->args);
+ if (arg == NULL) {
+ return NGX_ERROR;
+ }
+ arg->len = p - s->arg_start;
+ arg->data = s->arg_start;
+ s->arg_start = NULL;
+
+ switch (ch) {
+ case ' ':
+ state = sw_spaces_before_argument;
+ break;
+ case CR:
+ state = sw_almost_done;
+ break;
+ case LF:
+ goto done;
+ }
+ break;
+
+ default:
+ break;
+ }
+ break;
+
+ case sw_almost_done:
+ switch (ch) {
+ case LF:
+ goto done;
+ default:
+ goto invalid;
+ }
+ }
+ }
+
+ s->buffer->pos = p;
+ s->state = state;
+
+ return NGX_AGAIN;
+
+done:
+
+ s->buffer->pos = p + 1;
+
+ if (s->arg_start) {
+ arg = ngx_array_push(&s->args);
+ if (arg == NULL) {
+ return NGX_ERROR;
+ }
+ arg->len = s->arg_end - s->arg_start;
+ arg->data = s->arg_start;
+ s->arg_start = NULL;
+ }
+
+ s->state = (s->command != NGX_SMTP_AUTH) ? sw_start : sw_argument;
+
+ return NGX_OK;
+
+invalid:
+
+ s->state = sw_invalid;
+ s->arg_start = NULL;
+
+ /* skip invalid command till LF */
+
+ for (p = s->buffer->pos; p < s->buffer->last; p++) {
+ if (*p == LF) {
+ s->state = sw_start;
+ p++;
+ break;
+ }
+ }
+
+ s->buffer->pos = p;
+
+ return NGX_MAIL_PARSE_INVALID_COMMAND;
+}
+
+
+ngx_int_t
+ngx_mail_auth_parse(ngx_mail_session_t *s, ngx_connection_t *c)
+{
+ ngx_str_t *arg;
+
+#if (NGX_MAIL_SSL)
+ if (ngx_mail_starttls_only(s, c)) {
+ return NGX_MAIL_PARSE_INVALID_COMMAND;
+ }
+#endif
+
+ if (s->args.nelts == 0) {
+ return NGX_MAIL_PARSE_INVALID_COMMAND;
+ }
+
+ arg = s->args.elts;
+
+ if (arg[0].len == 5) {
+
+ if (ngx_strncasecmp(arg[0].data, (u_char *) "LOGIN", 5) == 0) {
+
+ if (s->args.nelts == 1) {
+ return NGX_MAIL_AUTH_LOGIN;
+ }
+
+ if (s->args.nelts == 2) {
+ return NGX_MAIL_AUTH_LOGIN_USERNAME;
+ }
+
+ return NGX_MAIL_PARSE_INVALID_COMMAND;
+ }
+
+ if (ngx_strncasecmp(arg[0].data, (u_char *) "PLAIN", 5) == 0) {
+
+ if (s->args.nelts == 1) {
+ return NGX_MAIL_AUTH_PLAIN;
+ }
+
+ if (s->args.nelts == 2) {
+ return ngx_mail_auth_plain(s, c, 1);
+ }
+ }
+
+ return NGX_MAIL_PARSE_INVALID_COMMAND;
+ }
+
+ if (arg[0].len == 8) {
+
+ if (ngx_strncasecmp(arg[0].data, (u_char *) "CRAM-MD5", 8) == 0) {
+
+ if (s->args.nelts != 1) {
+ return NGX_MAIL_PARSE_INVALID_COMMAND;
+ }
+
+ return NGX_MAIL_AUTH_CRAM_MD5;
+ }
+
+ if (ngx_strncasecmp(arg[0].data, (u_char *) "EXTERNAL", 8) == 0) {
+
+ if (s->args.nelts == 1) {
+ return NGX_MAIL_AUTH_EXTERNAL;
+ }
+
+ if (s->args.nelts == 2) {
+ return ngx_mail_auth_external(s, c, 1);
+ }
+ }
+
+ return NGX_MAIL_PARSE_INVALID_COMMAND;
+ }
+
+ return NGX_MAIL_PARSE_INVALID_COMMAND;
+}