/*
* Copyright (C) Igor Sysoev
* Copyright (C) Nginx, Inc.
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>
#include <ngx_mail.h>
static void ngx_mail_proxy_protocol_handler(ngx_event_t *rev);
static void ngx_mail_init_session_handler(ngx_event_t *rev);
static void ngx_mail_init_session(ngx_connection_t *c);
#if (NGX_MAIL_SSL)
static void ngx_mail_ssl_init_connection(ngx_ssl_t *ssl, ngx_connection_t *c);
static void ngx_mail_ssl_handshake_handler(ngx_connection_t *c);
static ngx_int_t ngx_mail_verify_cert(ngx_mail_session_t *s,
ngx_connection_t *c);
#endif
void
ngx_mail_init_connection(ngx_connection_t *c)
{
size_t len;
ngx_uint_t i;
ngx_event_t *rev;
ngx_mail_port_t *port;
struct sockaddr *sa;
struct sockaddr_in *sin;
ngx_mail_log_ctx_t *ctx;
ngx_mail_in_addr_t *addr;
ngx_mail_session_t *s;
ngx_mail_addr_conf_t *addr_conf;
ngx_mail_core_srv_conf_t *cscf;
u_char text[NGX_SOCKADDR_STRLEN];
#if (NGX_HAVE_INET6)
struct sockaddr_in6 *sin6;
ngx_mail_in6_addr_t *addr6;
#endif
/* find the server configuration for the address:port */
port = c->listening->servers;
if (port->naddrs > 1) {
/*
* There are several addresses on this port and one of them
* is the "*:port" wildcard so getsockname() is needed to determine
* the server address.
*
* AcceptEx() already gave this address.
*/
if (ngx_connection_local_sockaddr(c, NULL, 0) != NGX_OK) {
ngx_mail_close_connection(c);
return;
}
sa = c->local_sockaddr;
switch (sa->sa_family) {
#if (NGX_HAVE_INET6)
case AF_INET6:
sin6 = (struct sockaddr_in6 *) sa;
addr6 = port->addrs;
/* the last address is "*" */
for (i = 0; i < port->naddrs - 1; i++) {
if (ngx_memcmp(&addr6[i].addr6, &sin6->sin6_addr, 16) == 0) {
break;
}
}
addr_conf = &addr6[i].conf;
break;
#endif
default: /* AF_INET */
sin = (struct sockaddr_in *) sa;
addr = port->addrs;
/* the last address is "*" */
for (i = 0; i < port->naddrs - 1; i++) {
if (addr[i].addr == sin->sin_addr.s_addr) {
break;
}
}
addr_conf = &addr[i].conf;
break;
}
} else {
switch (c->local_sockaddr->sa_family) {
#if (NGX_HAVE_INET6)
case AF_INET6:
addr6 = port->addrs;
addr_conf = &addr6[0].conf;
break;
#endif
default: /* AF_INET */
addr = port->addrs;
addr_conf = &addr[0].conf;
break;
}
}
s = ngx_pcalloc(c->pool, sizeof(ngx_mail_session_t));
if (s == NULL) {
ngx_mail_close_connection(c);
return;
}
s->signature = NGX_MAIL_MODULE;
s->main_conf = addr_conf->ctx->main_conf;
s->srv_conf = addr_conf->ctx->srv_conf;
#if (NGX_MAIL_SSL)
s->ssl = addr_conf->ssl;
#endif
s->addr_text = &addr_conf->addr_text;
c->data = s;
s->connection = c;
cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
ngx_set_connection_log(c, cscf->error_log);
len = ngx_sock_ntop(c->sockaddr, c->socklen, text, NGX_SOCKADDR_STRLEN, 1);
ngx_log_error(NGX_LOG_INFO, c->log, 0, "*%uA client %*s connected to %V",
c->number, len, text, s->addr_text);
ctx = ngx_palloc(c->pool, sizeof(ngx_mail_log_ctx_t));
if (ctx == NULL) {
ngx_mail_close_connection(c);
return;
}
ctx->client = &c->addr_text;
ctx->session = s;
c->log->connection = c->number;
c->log->handler = ngx_mail_log_error;
c->log->data = ctx;
c->log->action = "sending client greeting line";
c->log_error = NGX_ERROR_INFO;
rev = c->read;
rev->handler = ngx_mail_init_session_handler;
if (addr_conf->proxy_protocol) {
c->log->action = "reading PROXY protocol";
rev->handler = ngx_mail_proxy_protocol_handler;
if (!rev->ready) {
ngx_add_timer(rev, cscf->timeout);
if (ngx_handle_read_event(rev, 0) != NGX_OK) {
ngx_mail_close_connection(c);
}
return;
}
}
if (ngx_use_accept_mutex) {
ngx_post_event(rev, &ngx_posted_events);
return;
}
rev->handler(rev);
}
static void
ngx_mail_proxy_protocol_handler(ngx_event_t *rev)
{
u_char *p, buf[NGX_PROXY_PROTOCOL_MAX_HEADER];
size_t size;
ssize_t n;
ngx_err_t err;
ngx_connection_t *c;
ngx_mail_session_t *s;
ngx_mail_core_srv_conf_t *cscf;
c = rev->data;
s = c->data;
ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0,
"mail PROXY protocol handler");
if (rev->timedout) {
ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out");
c->timedout = 1;
ngx_mail_close_connection(c);
return;
}
n = recv(c->fd, (char *) buf, sizeof(buf), MSG_PEEK);
err = ngx_socket_errno;
ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0, "recv(): %z", n);
if (n == -1) {
if (err == NGX_EAGAIN) {
rev->ready = 0;
if (!rev->timer_set) {
cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
ngx_add_timer(rev, cscf->timeout);
}
if (ngx_handle_read_event(rev, 0) != NGX_OK) {
ngx_mail_close_connection(c);
}
return;
}
ngx_connection_error(c, err, "recv() failed");
ngx_mail_close_connection(c);
return;
}
p = ngx_proxy_protocol_read(c, buf, buf + n);
if (p == NULL) {
ngx_mail_close_connection(c);
return;
}
size = p - buf;
if (c->recv(c, buf, size) != (ssize_t) size) {
ngx_mail_close_connection(c);
return;
}
if (ngx_mail_realip_handler(s) != NGX_OK) {
ngx_mail_close_connection(c);
return;
}
ngx_mail_init_session_handler(rev);
}
static void
ngx_mail_init_session_handler(ngx_event_t *rev)
{
ngx_connection_t *c;
c = rev->data;
#if (NGX_MAIL_SSL)
{
ngx_mail_session_t *s;
ngx_mail_ssl_conf_t *sslcf;
s = c->data;
if (s->ssl) {
c->log->action = "SSL handshaking";
sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module);
ngx_mail_ssl_init_connection(&sslcf->ssl, c);
return;
}
}
#endif
ngx_mail_init_session(c);
}
#if (NGX_MAIL_SSL)
void
ngx_mail_starttls_handler(ngx_event_t *rev)
{
ngx_connection_t *c;
ngx_mail_session_t *s;
ngx_mail_ssl_conf_t *sslcf;
c = rev->data;
s = c->data;
s->starttls = 1;
c->log->action = "in starttls state";
sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module);
ngx_mail_ssl_init_connection(&sslcf->ssl, c);
}
static void
ngx_mail_ssl_init_connection(ngx_ssl_t *ssl, ngx_connection_t *c)
{
ngx_mail_session_t *s;
ngx_mail_core_srv_conf_t *cscf;
if (ngx_ssl_create_connection(ssl, c, 0) != NGX_OK) {
ngx_mail_close_connection(c);
return;
}
if (ngx_ssl_handshake(c) == NGX_AGAIN) {
s = c->data;
if (!c->read->timer_set) {
cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
ngx_add_timer(c->read, cscf->timeout);
}
c->ssl->handler = ngx_mail_ssl_handshake_handler;
return;
}
ngx_mail_ssl_handshake_handler(c);
}
static void
ngx_mail_ssl_handshake_handler(ngx_connection_t *c)
{
ngx_mail_session_t *s;
ngx_mail_core_srv_conf_t *cscf;
if (c->ssl->handshaked) {
s = c->data;
if (ngx_mail_verify_cert(s, c) != NGX_OK) {
return;
}
if (s->starttls) {
cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
c->read->handler = cscf->protocol->init_protocol;
c->write->handler = ngx_mail_send;
cscf->protocol->init_protocol(c->read);
return;
}
c->read->ready = 0;
ngx_mail_init_session(c);
return;
}
ngx_mail_close_connection(c);
}
static ngx_int_t
ngx_mail_verify_cert(ngx_mail_session_t *s, ngx_connection_t *c)
{
long rc;
X509 *cert;
ngx_mail_ssl_conf_t *sslcf;
ngx_mail_core_srv_conf_t *cscf;
sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module);
if (!sslcf->verify) {
return NGX_OK;
}
rc = SSL_get_verify_result(c->ssl->connection);
if (rc != X509_V_OK
&& (sslcf->verify != 3 || !ngx_ssl_verify_error_optional(rc)))
{
ngx_log_error(NGX_LOG_INFO, c->log, 0,
"client SSL certificate verify error: (%l:%s)",
rc, X509_verify_cert_error_string(rc));
ngx_ssl_remove_cached_session(c->ssl->session_ctx,
(SSL_get0_session(c->ssl->connection)));
cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
s->out = cscf->protocol->cert_error;
s->quit = 1;
c->write->handler = ngx_mail_send;
ngx_mail_send(s->connection->write);
return NGX_ERROR;
}
if (sslcf->verify == 1) {
cert = SSL_get_peer_certificate(c->ssl->connection);
if (cert == NULL) {
ngx_log_error(NGX_LOG_INFO, c->log, 0,
"client sent no required SSL certificate");
ngx_ssl_remove_cached_session(c->ssl->session_ctx,
(SSL_get0_session(c->ssl->connection)));
cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
s->out = cscf->protocol->no_cert;
s->quit = 1;
c->write->handler = ngx_mail_send;
ngx_mail_send(s->connection->write);
return NGX_ERROR;
}
X509_free(cert);
}
return NGX_OK;
}
#endif
static void
ngx_mail_init_session(ngx_connection_t *c)
{
ngx_mail_session_t *s;
ngx_mail_core_srv_conf_t *cscf;
s = c->data;
c->log->action = "sending client greeting line";
cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
s->protocol = cscf->protocol->type;
s->ctx = ngx_pcalloc(c->pool, sizeof(void *) * ngx_mail_max_module);
if (s->ctx == NULL) {
ngx_mail_session_internal_server_error(s);
return;
}
c->write->handler = ngx_mail_send;
cscf->protocol->init_session(s, c);
}
ngx_int_t
ngx_mail_salt(ngx_mail_session_t *s, ngx_connection_t *c,
ngx_mail_core_srv_conf_t *cscf)
{
s->salt.data = ngx_pnalloc(c->pool,
sizeof(" <18446744073709551616.@>" CRLF) - 1
+ NGX_TIME_T_LEN
+ cscf->server_name.len);
if (s->salt.data == NULL) {
return NGX_ERROR;
}
s->salt.len = ngx_sprintf(s->salt.data, "<%ul.%T@%V>" CRLF,
ngx_random(), ngx_time(), &cscf->server_name)
- s->salt.data;
return NGX_OK;
}
#if (NGX_MAIL_SSL)
ngx_int_t
ngx_mail_starttls_only(ngx_mail_session_t *s, ngx_connection_t *c)
{
ngx_mail_ssl_conf_t *sslcf;
if (c->ssl) {
return 0;
}
sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module);
if (sslcf->starttls == NGX_MAIL_STARTTLS_ONLY) {
return 1;
}
return 0;
}
#endif
ngx_int_t
ngx_mail_auth_plain(ngx_mail_session_t *s, ngx_connection_t *c, ngx_uint_t n)
{
u_char *p, *last;
ngx_str_t *arg, plain;
arg = s->args.elts;
#if (NGX_DEBUG_MAIL_PASSWD)
ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0,
"mail auth plain: \"%V\"", &arg[n]);
#endif
plain.data = ngx_pnalloc(c->pool, ngx_base64_decoded_length(arg[n].len));
if (plain.data == NULL) {
return NGX_ERROR;
}
if (ngx_decode_base64(&plain, &arg[n]) != NGX_OK) {
ngx_log_error(NGX_LOG_INFO, c->log, 0,
"client sent invalid base64 encoding in AUTH PLAIN command");
return NGX_MAIL_PARSE_INVALID_COMMAND;
}
p = plain.data;
last = p + plain.len;
while (p < last && *p++) { /* void */ }
if (p == last) {
ngx_log_error(NGX_LOG_INFO, c->log, 0,
"client sent invalid login in AUTH PLAIN command");
return NGX_MAIL_PARSE_INVALID_COMMAND;
}
s->login.data = p;
while (p < last && *p) { p++; }
if (p == last) {
ngx_log_error(NGX_LOG_INFO, c->log, 0,
"client sent invalid password in AUTH PLAIN command");
return NGX_MAIL_PARSE_INVALID_COMMAND;
}
s->login.len = p++ - s->login.data;
s->passwd.len = last - p;
s->passwd.data = p;
#if (NGX_DEBUG_MAIL_PASSWD)
ngx_log_debug2(NGX_LOG_DEBUG_MAIL, c->log, 0,
"mail auth plain: \"%V\" \"%V\"", &s->login, &s->passwd);
#endif
return NGX_DONE;
}
ngx_int_t
ngx_mail_auth_login_username(ngx_mail_session_t *s, ngx_connection_t *c,
ngx_uint_t n)
{
ngx_str_t *arg;
arg = s->args.elts;
ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0,
"mail auth login username: \"%V\"", &arg[n]);
s->login.data = ngx_pnalloc(c->pool, ngx_base64_decoded_length(arg[n].len));
if (s->login.data == NULL) {
return NGX_ERROR;
}
if (ngx_decode_base64(&s->login, &arg[n]) != NGX_OK) {
ngx_log_error(NGX_LOG_INFO, c->log, 0,
"client sent invalid base64 encoding in AUTH LOGIN command");
return NGX_MAIL_PARSE_INVALID_COMMAND;
}
ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0,
"mail auth login username: \"%V\"", &s->login);
return NGX_OK;
}
ngx_int_t
ngx_mail_auth_login_password(ngx_mail_session_t *s, ngx_connection_t *c)
{
ngx_str_t *arg;
arg = s->args.elts;
#if (NGX_DEBUG_MAIL_PASSWD)
ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0,
"mail auth login password: \"%V\"", &arg[0]);
#endif
s->passwd.data = ngx_pnalloc(c->pool,
ngx_base64_decoded_length(arg[0].len));
if (s->passwd.data == NULL) {
return NGX_ERROR;
}
if (ngx_decode_base64(&s->passwd, &arg[0]) != NGX_OK) {
ngx_log_error(NGX_LOG_INFO, c->log, 0,
"client sent invalid base64 encoding in AUTH LOGIN command");
return NGX_MAIL_PARSE_INVALID_COMMAND;
}
#if (NGX_DEBUG_MAIL_PASSWD)
ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0,
"mail auth login password: \"%V\"", &s->passwd);
#endif
return NGX_DONE;
}
ngx_int_t
ngx_mail_auth_cram_md5_salt(ngx_mail_session_t *s, ngx_connection_t *c,
char *prefix, size_t len)
{
u_char *p;
ngx_str_t salt;
ngx_uint_t n;
p = ngx_pnalloc(c->pool, len + ngx_base64_encoded_length(s->salt.len) + 2);
if (p == NULL) {
return NGX_ERROR;
}
salt.data = ngx_cpymem(p, prefix, len);
s->salt.len -= 2;
ngx_encode_base64(&salt, &s->salt);
s->salt.len += 2;
n = len + salt.len;
p[n++] = CR; p[n++] = LF;
s->out.len = n;
s->out.data = p;
return NGX_OK;
}
ngx_int_t
ngx_mail_auth_cram_md5(ngx_mail_session_t *s, ngx_connection_t *c)
{
u_char *p, *last;
ngx_str_t *arg;
arg = s->args.elts;
ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0,
"mail auth cram-md5: \"%V\"", &arg[0]);
s->login.data = ngx_pnalloc(c->pool, ngx_base64_decoded_length(arg[0].len));
if (s->login.data == NULL) {
return NGX_ERROR;
}
if (ngx_decode_base64(&s->login, &arg[0]) != NGX_OK) {
ngx_log_error(NGX_LOG_INFO, c->log, 0,
"client sent invalid base64 encoding in AUTH CRAM-MD5 command");
return NGX_MAIL_PARSE_INVALID_COMMAND;
}
p = s->login.data;
last = p + s->login.len;
while (p < last) {
if (*p++ == ' ') {
s->login.len = p - s->login.data - 1;
s->passwd.len = last - p;
s->passwd.data = p;
break;
}
}
if (s->passwd.len != 32) {
ngx_log_error(NGX_LOG_INFO, c->log, 0,
"client sent invalid CRAM-MD5 hash in AUTH CRAM-MD5 command");
return NGX_MAIL_PARSE_INVALID_COMMAND;
}
ngx_log_debug2(NGX_LOG_DEBUG_MAIL, c->log, 0,
"mail auth cram-md5: \"%V\" \"%V\"", &s->login, &s->passwd);
s->auth_method = NGX_MAIL_AUTH_CRAM_MD5;
return NGX_DONE;
}
ngx_int_t
ngx_mail_auth_external(ngx_mail_session_t *s, ngx_connection_t *c,
ngx_uint_t n)
{
ngx_str_t *arg, external;
arg = s->args.elts;
ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0,
"mail auth external: \"%V\"", &arg[n]);
external.data = ngx_pnalloc(c->pool, ngx_base64_decoded_length(arg[n].len));
if (external.data == NULL) {
return NGX_ERROR;
}
if (ngx_decode_base64(&external, &arg[n]) != NGX_OK) {
ngx_log_error(NGX_LOG_INFO, c->log, 0,
"client sent invalid base64 encoding in AUTH EXTERNAL command");
return NGX_MAIL_PARSE_INVALID_COMMAND;
}
s->login.len = external.len;
s->login.data = external.data;
ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0,
"mail auth external: \"%V\"", &s->login);
s->auth_method = NGX_MAIL_AUTH_EXTERNAL;
return NGX_DONE;
}
void
ngx_mail_send(ngx_event_t *wev)
{
ngx_int_t n;
ngx_connection_t *c;
ngx_mail_session_t *s;
ngx_mail_core_srv_conf_t *cscf;
c = wev->data;
s = c->data;
if (wev->timedout) {
ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out");
c->timedout = 1;
ngx_mail_close_connection(c);
return;
}
if (s->out.len == 0) {
if (ngx_handle_write_event(c->write, 0) != NGX_OK) {
ngx_mail_close_connection(c);
}
return;
}
n = c->send(c, s->out.data, s->out.len);
if (n > 0) {
s->out.data += n;
s->out.len -= n;
if (s->out.len != 0) {
goto again;
}
if (wev->timer_set) {
ngx_del_timer(wev);
}
if (s->quit) {
ngx_mail_close_connection(c);
return;
}
if (s->blocked) {
c->read->handler(c->read);
}
return;
}
if (n == NGX_ERROR) {
ngx_mail_close_connection(c);
return;
}
/* n == NGX_AGAIN */
again:
cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
ngx_add_timer(c->write, cscf->timeout);
if (ngx_handle_write_event(c->write, 0) != NGX_OK) {
ngx_mail_close_connection(c);
return;
}
}
ngx_int_t
ngx_mail_read_command(ngx_mail_session_t *s, ngx_connection_t *c)
{
ssize_t n;
ngx_int_t rc;
ngx_str_t l;
ngx_mail_core_srv_conf_t *cscf;
if (s->buffer->last < s->buffer->end) {
n = c->recv(c, s->buffer->last, s->buffer->end - s->buffer->last);
if (n == NGX_ERROR || n == 0) {
ngx_mail_close_connection(c);
return NGX_ERROR;
}
if (n > 0) {
s->buffer->last += n;
}
if (n == NGX_AGAIN) {
if (s->buffer->pos == s->buffer->last) {
return NGX_AGAIN;
}
}
}
cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
rc = cscf->protocol->parse_command(s);
if (rc == NGX_AGAIN) {
if (s->buffer->last < s->buffer->end) {
return rc;
}
l.len = s->buffer->last - s->buffer->start;
l.data = s->buffer->start;
ngx_log_error(NGX_LOG_INFO, c->log, 0,
"client sent too long command \"%V\"", &l);
s->quit = 1;
return NGX_MAIL_PARSE_INVALID_COMMAND;
}
if (rc == NGX_MAIL_PARSE_INVALID_COMMAND) {
s->errors++;
if (s->errors >= cscf->max_errors) {
ngx_log_error(NGX_LOG_INFO, c->log, 0,
"client sent too many invalid commands");
s->quit = 1;
}
return rc;
}
if (rc == NGX_IMAP_NEXT) {
return rc;
}
if (rc == NGX_ERROR) {
ngx_mail_close_connection(c);
return NGX_ERROR;
}
return NGX_OK;
}
void
ngx_mail_auth(ngx_mail_session_t *s, ngx_connection_t *c)
{
s->args.nelts = 0;
if (s->buffer->pos == s->buffer->last) {
s->buffer->pos = s->buffer->start;
s->buffer->last = s->buffer->start;
}
s->state = 0;
if (c->read->timer_set) {
ngx_del_timer(c->read);
}
s->login_attempt++;
ngx_mail_auth_http_init(s);
}
void
ngx_mail_session_internal_server_error(ngx_mail_session_t *s)
{
ngx_mail_core_srv_conf_t *cscf;
cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
s->out = cscf->protocol->internal_server_error;
s->quit = 1;
ngx_mail_send(s->connection->write);
}
void
ngx_mail_close_connection(ngx_connection_t *c)
{
ngx_pool_t *pool;
ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0,
"close mail connection: %d", c->fd);
#if (NGX_MAIL_SSL)
if (c->ssl) {
if (ngx_ssl_shutdown(c) == NGX_AGAIN) {
c->ssl->handler = ngx_mail_close_connection;
return;
}
}
#endif
#if (NGX_STAT_STUB)
(void) ngx_atomic_fetch_add(ngx_stat_active, -1);
#endif
c->destroyed = 1;
pool = c->pool;
ngx_close_connection(c);
ngx_destroy_pool(pool);
}
u_char *
ngx_mail_log_error(ngx_log_t *log, u_char *buf, size_t len)
{
u_char *p;
ngx_mail_session_t *s;
ngx_mail_log_ctx_t *ctx;
if (log->action) {
p = ngx_snprintf(buf, len, " while %s", log->action);
len -= p - buf;
buf = p;
}
ctx = log->data;
p = ngx_snprintf(buf, len, ", client: %V", ctx->client);
len -= p - buf;
buf = p;
s = ctx->session;
if (s == NULL) {
return p;
}
p = ngx_snprintf(buf, len, "%s, server: %V",
s->starttls ? " using starttls" : "",
s->addr_text);
len -= p - buf;
buf = p;
if (s->login.len == 0) {
return p;
}
p = ngx_snprintf(buf, len, ", login: \"%V\"", &s->login);
len -= p - buf;
buf = p;
if (s->proxy == NULL) {
return p;
}
p = ngx_snprintf(buf, len, ", upstream: %V", s->proxy->upstream.name);
return p;
}
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