ustream-ssl.c

   1 /*
   2  * ustream-ssl - library for SSL over ustream
   3  *
   4  * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
   5  *
   6  * Permission to use, copy, modify, and/or distribute this software for any
   7  * purpose with or without fee is hereby granted, provided that the above
   8  * copyright notice and this permission notice appear in all copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17  */
  18
  19 #include <errno.h>
  20 #include <libubox/ustream.h>
  21
  22 #include "ustream-ssl.h"
  23 #include "ustream-internal.h"
  24
  25 static void ustream_ssl_error_cb(struct uloop_timeout *t)
  26 {
  27         struct ustream_ssl *us = container_of(t, struct ustream_ssl, error_timer);
  28         static char buffer[128];
  29         int error = us->error;
  30
  31         if (us->notify_error)
  32                 us->notify_error(us, error, __ustream_ssl_strerror(us->error, buffer, sizeof(buffer)));
  33 }
  34
  35 static void ustream_ssl_check_conn(struct ustream_ssl *us)
  36 {
  37         if (us->connected || us->error)
  38                 return;
  39
  40         if (__ustream_ssl_connect(us) == U_SSL_OK) {
  41                 us->connected = true;
  42                 if (us->notify_connected)
  43                         us->notify_connected(us);
  44         }
  45 }
  46
  47 static bool __ustream_ssl_poll(struct ustream *s)
  48 {
  49         struct ustream_ssl *us = container_of(s->next, struct ustream_ssl, stream);
  50         char *buf;
  51         int len, ret;
  52         bool more = false;
  53
  54         ustream_ssl_check_conn(us);
  55         if (!us->connected || us->error)
  56                 return false;
  57
  58         do {
  59                 buf = ustream_reserve(&us->stream, 1, &len);
  60                 if (!len)
  61                         break;
  62
  63                 ret = __ustream_ssl_read(us, buf, len);
  64                 switch (ret) {
  65                 case U_SSL_PENDING:
  66                         return more;
  67                 case U_SSL_ERROR:
  68                         return false;
  69                 case 0:
  70                         us->stream.eof = true;
  71                         ustream_state_change(&us->stream);
  72                         return false;
  73                 default:
  74                         ustream_fill_read(&us->stream, ret);
  75                         more = true;
  76                         continue;
  77                 }
  78         } while (1);
  79
  80         return more;
  81 }
  82
  83 static void ustream_ssl_notify_read(struct ustream *s, int bytes)
  84 {
  85         __ustream_ssl_poll(s);
  86 }
  87
  88 static void ustream_ssl_notify_write(struct ustream *s, int bytes)
  89 {
  90         struct ustream_ssl *us = container_of(s->next, struct ustream_ssl, stream);
  91
  92         ustream_ssl_check_conn(us);
  93         ustream_write_pending(s->next);
  94 }
  95
  96 static void ustream_ssl_notify_state(struct ustream *s)
  97 {
  98         s->next->write_error = true;
  99         ustream_state_change(s->next);
 100 }
 101
 102 static int ustream_ssl_write(struct ustream *s, const char *buf, int len, bool more)
 103 {
 104         struct ustream_ssl *us = container_of(s, struct ustream_ssl, stream);
 105
 106         if (!us->connected || us->error)
 107                 return 0;
 108
 109         if (us->conn->w.data_bytes)
 110                 return 0;
 111
 112         return __ustream_ssl_write(us, buf, len);
 113 }
 114
 115 static void ustream_ssl_set_read_blocked(struct ustream *s)
 116 {
 117         struct ustream_ssl *us = container_of(s, struct ustream_ssl, stream);
 118
 119         ustream_set_read_blocked(us->conn, !!s->read_blocked);
 120 }
 121
 122 static void ustream_ssl_free(struct ustream *s)
 123 {
 124         struct ustream_ssl *us = container_of(s, struct ustream_ssl, stream);
 125
 126         if (us->conn) {
 127                 us->conn->next = NULL;
 128                 us->conn->notify_read = NULL;
 129                 us->conn->notify_write = NULL;
 130                 us->conn->notify_state = NULL;
 131         }
 132
 133         uloop_timeout_cancel(&us->error_timer);
 134         __ustream_ssl_session_free(us->ssl);
 135         us->ctx = NULL;
 136         us->ssl = NULL;
 137         us->conn = NULL;
 138         us->connected = false;
 139         us->error = false;
 140 }
 141
 142 static bool ustream_ssl_poll(struct ustream *s)
 143 {
 144         struct ustream_ssl *us = container_of(s, struct ustream_ssl, stream);
 145         bool fd_poll;
 146
 147         fd_poll = ustream_poll(us->conn);
 148         return __ustream_ssl_poll(s) || fd_poll;
 149 }
 150
 151 static void ustream_ssl_stream_init(struct ustream_ssl *us)
 152 {
 153         struct ustream *conn = us->conn;
 154         struct ustream *s = &us->stream;
 155
 156         conn->notify_read = ustream_ssl_notify_read;
 157         conn->notify_write = ustream_ssl_notify_write;
 158         conn->notify_state = ustream_ssl_notify_state;
 159
 160         s->free = ustream_ssl_free;
 161         s->write = ustream_ssl_write;
 162         s->poll = ustream_ssl_poll;
 163         s->set_read_blocked = ustream_ssl_set_read_blocked;
 164         ustream_init_defaults(s);
 165 }
 166
 167 static int _ustream_ssl_init(struct ustream_ssl *us, struct ustream *conn, void *ctx, bool server)
 168 {
 169         us->error_timer.cb = ustream_ssl_error_cb;
 170         us->server = server;
 171         us->conn = conn;
 172         us->ctx = ctx;
 173
 174         us->ssl = __ustream_ssl_session_new(us->ctx);
 175         if (!us->ssl)
 176                 return -ENOMEM;
 177
 178         conn->next = &us->stream;
 179         ustream_set_io(ctx, us->ssl, conn);
 180         ustream_ssl_stream_init(us);
 181
 182         return 0;
 183 }
 184
 185 const struct ustream_ssl_ops ustream_ssl_ops = {
 186         .context_new = __ustream_ssl_context_new,
 187         .context_set_crt_file = __ustream_ssl_set_crt_file,
 188         .context_set_key_file = __ustream_ssl_set_key_file,
 189         .context_free = __ustream_ssl_context_free,
 190         .init = _ustream_ssl_init,
 191 };