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Sources/ustream-ssl/ustream-io-openssl.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 <string.h>
 20 
 21 #include <libubox/ustream.h>
 22 
 23 #include "ustream-ssl.h"
 24 #include "openssl_bio_compat.h"
 25 #include "ustream-internal.h"
 26 
 27 static int
 28 s_ustream_new(BIO *b)
 29 {
 30         BIO_set_init(b, 1);
 31         BIO_set_data(b, NULL);
 32         BIO_clear_flags(b, ~0);
 33         return 1;
 34 }
 35 
 36 static int
 37 s_ustream_free(BIO *b)
 38 {
 39         if (!b)
 40                 return 0;
 41 
 42         BIO_set_data(b, NULL);
 43         BIO_set_init(b, 0);
 44         BIO_clear_flags(b, ~0);
 45         return 1;
 46 }
 47 
 48 static int
 49 s_ustream_read(BIO *b, char *buf, int len)
 50 {
 51         struct ustream *s;
 52         char *sbuf;
 53         int slen;
 54 
 55         if (!buf || len <= 0)
 56                 return 0;
 57 
 58         s = (struct ustream *)BIO_get_data(b);
 59         if (!s)
 60                 return 0;
 61 
 62         sbuf = ustream_get_read_buf(s, &slen);
 63 
 64         BIO_clear_retry_flags(b);
 65         if (!slen) {
 66                 BIO_set_retry_read(b);
 67                 return -1;
 68         }
 69 
 70         if (slen > len)
 71                 slen = len;
 72 
 73         memcpy(buf, sbuf, slen);
 74         ustream_consume(s, slen);
 75 
 76         return slen;
 77 }
 78 
 79 static int
 80 s_ustream_write(BIO *b, const char *buf, int len)
 81 {
 82         struct ustream *s;
 83 
 84         if (!buf || len <= 0)
 85                 return 0;
 86 
 87         s = (struct ustream *)BIO_get_data(b);
 88         if (!s)
 89                 return 0;
 90 
 91         if (s->write_error)
 92                 return len;
 93 
 94         return ustream_write(s, buf, len, false);
 95 }
 96 
 97 static int
 98 s_ustream_gets(BIO *b, char *buf, int len)
 99 {
100         return -1;
101 }
102 
103 static int
104 s_ustream_puts(BIO *b, const char *str)
105 {
106         return s_ustream_write(b, str, strlen(str));
107 }
108 
109 static long s_ustream_ctrl(BIO *b, int cmd, long num, void *ptr)
110 {
111         switch (cmd) {
112         case BIO_CTRL_FLUSH:
113                 return 1;
114         default:
115                 return 0;
116         };
117 }
118 
119 static BIO *ustream_bio_new(struct ustream *s)
120 {
121         BIO *bio;
122 
123         BIO_METHOD *methods_ustream;
124 
125         methods_ustream = BIO_meth_new(100 | BIO_TYPE_SOURCE_SINK, "ustream");
126         BIO_meth_set_write(methods_ustream, s_ustream_write);
127         BIO_meth_set_read(methods_ustream, s_ustream_read);
128         BIO_meth_set_puts(methods_ustream, s_ustream_puts);
129         BIO_meth_set_gets(methods_ustream, s_ustream_gets);
130         BIO_meth_set_ctrl(methods_ustream, s_ustream_ctrl);
131         BIO_meth_set_create(methods_ustream, s_ustream_new);
132         BIO_meth_set_destroy(methods_ustream, s_ustream_free);
133         bio = BIO_new(methods_ustream);
134         BIO_set_data(bio, s);
135 
136         return bio;
137 }
138 
139 __hidden void ustream_set_io(struct ustream_ssl_ctx *ctx, void *ssl, struct ustream *conn)
140 {
141         BIO *bio = ustream_bio_new(conn);
142         SSL_set_bio(ssl, bio, bio);
143 }
144 

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