release/src/router/vsftpd/readwrite.c

   1 /*
   2  * Part of Very Secure FTPd
   3  * Licence: GPL v2
   4  * Author: Chris Evans
   5  * readwrite.c
   6  *
   7  * Routines to encapsulate the underlying read / write mechanism (OpenSSL vs.
   8  * plain read()/write()).
   9  */
  10
  11 #include "readwrite.h"
  12 #include "session.h"
  13 #include "netstr.h"
  14 #include "ssl.h"
  15 #include "privsock.h"
  16 #include "defs.h"
  17 #include "sysutil.h"
  18
  19 static int plain_peek_adapter(struct vsf_session* p_sess,
  20                               char* p_buf,
  21                               unsigned int len);
  22 static int plain_read_adapter(struct vsf_session* p_sess,
  23                               char* p_buf,
  24                               unsigned int len);
  25 static int ssl_peek_adapter(struct vsf_session* p_sess,
  26                             char* p_buf,
  27                             unsigned int len);
  28 static int ssl_read_adapter(struct vsf_session* p_sess,
  29                             char* p_buf,
  30                             unsigned int len);
  31
  32 int
  33 ftp_write_str(const struct vsf_session* p_sess, const struct mystr* p_str,
  34               enum EVSFRWTarget target)
  35 {
  36   if (target == kVSFRWData)
  37   {
  38     if (p_sess->data_use_ssl && p_sess->ssl_slave_active)
  39     {
  40       int ret = -1;
  41       int written;
  42       priv_sock_send_cmd(p_sess->ssl_consumer_fd, PRIV_SOCK_DO_SSL_WRITE);
  43       priv_sock_send_str(p_sess->ssl_consumer_fd, p_str);
  44       written = priv_sock_get_int(p_sess->ssl_consumer_fd);
  45       if (written > 0 && written == (int) str_getlen(p_str))
  46       {
  47         ret = 0;
  48       }
  49       return ret;
  50     }
  51     else if (p_sess->data_use_ssl)
  52     {
  53       return ssl_write_str(p_sess->p_data_ssl, p_str);
  54     }
  55     else
  56     {
  57       return str_netfd_write(p_str, p_sess->data_fd);
  58     }
  59   }
  60   else
  61   {
  62     if (p_sess->control_use_ssl && p_sess->ssl_slave_active)
  63     {
  64       priv_sock_send_cmd(p_sess->ssl_consumer_fd, PRIV_SOCK_WRITE_USER_RESP);
  65       priv_sock_send_str(p_sess->ssl_consumer_fd, p_str);
  66       return priv_sock_get_int(p_sess->ssl_consumer_fd);
  67     }
  68     else if (p_sess->control_use_ssl)
  69     {
  70       return ssl_write_str(p_sess->p_control_ssl, p_str);
  71     }
  72     else
  73     {
  74       return str_netfd_write(p_str, VSFTP_COMMAND_FD);
  75     }
  76   }
  77 }
  78
  79 int
  80 ftp_read_data(struct vsf_session* p_sess, char* p_buf, unsigned int len)
  81 {
  82   if (p_sess->data_use_ssl && p_sess->ssl_slave_active)
  83   {
  84     int ret;
  85     priv_sock_send_cmd(p_sess->ssl_consumer_fd, PRIV_SOCK_DO_SSL_READ);
  86     ret = priv_sock_get_int(p_sess->ssl_consumer_fd);
  87     priv_sock_recv_buf(p_sess->ssl_consumer_fd, p_buf, len);
  88     /* Need to do this here too because it is useless in the slave process. */
  89     vsf_sysutil_check_pending_actions(kVSFSysUtilIO, ret, p_sess->data_fd);
  90     return ret;
  91   }
  92   else if (p_sess->data_use_ssl)
  93   {
  94     return ssl_read(p_sess, p_sess->p_data_ssl, p_buf, len);
  95   }
  96   else
  97   {
  98     return vsf_sysutil_read(p_sess->data_fd, p_buf, len);
  99   }
 100 }
 101
 102 int
 103 ftp_write_data(const struct vsf_session* p_sess, const char* p_buf,
 104                unsigned int len)
 105 {
 106   if (p_sess->data_use_ssl && p_sess->ssl_slave_active)
 107   {
 108     int ret;
 109     priv_sock_send_cmd(p_sess->ssl_consumer_fd, PRIV_SOCK_DO_SSL_WRITE);
 110     priv_sock_send_buf(p_sess->ssl_consumer_fd, p_buf, len);
 111     ret = priv_sock_get_int(p_sess->ssl_consumer_fd);
 112     /* Need to do this here too because it is useless in the slave process. */
 113     vsf_sysutil_check_pending_actions(kVSFSysUtilIO, ret, p_sess->data_fd);
 114     return ret;
 115   }
 116   else if (p_sess->data_use_ssl)
 117   {
 118     return ssl_write(p_sess->p_data_ssl, p_buf, len);
 119   }
 120   else
 121   {
 122     return vsf_sysutil_write_loop(p_sess->data_fd, p_buf, len);
 123   }
 124 }
 125
 126 int
 127 ftp_getline(struct vsf_session* p_sess, struct mystr* p_str, char* p_buf)
 128 {
 129   if (p_sess->control_use_ssl && p_sess->ssl_slave_active)
 130   {
 131     int ret;
 132     priv_sock_send_cmd(p_sess->ssl_consumer_fd, PRIV_SOCK_GET_USER_CMD);
 133     ret = priv_sock_get_int(p_sess->ssl_consumer_fd);
 134     if (ret >= 0)
 135     {
 136       priv_sock_get_str(p_sess->ssl_consumer_fd, p_str);
 137     }
 138     return ret;
 139   }
 140   else
 141   {
 142     str_netfd_read_t p_peek = plain_peek_adapter;
 143     str_netfd_read_t p_read = plain_read_adapter;
 144     if (p_sess->control_use_ssl)
 145     {
 146       p_peek = ssl_peek_adapter;
 147       p_read = ssl_read_adapter;
 148     }
 149     return str_netfd_alloc(p_sess,
 150                            p_str,
 151                            '\n',
 152                            p_buf,
 153                            VSFTP_MAX_COMMAND_LINE,
 154                            p_peek,
 155                            p_read);
 156   }
 157 }
 158
 159 static int
 160 plain_peek_adapter(struct vsf_session* p_sess, char* p_buf, unsigned int len)
 161 {
 162   (void) p_sess;
 163   return vsf_sysutil_recv_peek(VSFTP_COMMAND_FD, p_buf, len);
 164 }
 165
 166 static int
 167 plain_read_adapter(struct vsf_session* p_sess, char* p_buf, unsigned int len)
 168 {
 169   (void) p_sess;
 170   return vsf_sysutil_read_loop(VSFTP_COMMAND_FD, p_buf, len);
 171 }
 172
 173 static int
 174 ssl_peek_adapter(struct vsf_session* p_sess, char* p_buf, unsigned int len)
 175 {
 176   return ssl_peek(p_sess, p_sess->p_control_ssl, p_buf, len);
 177 }
 178
 179 static int
 180 ssl_read_adapter(struct vsf_session* p_sess, char* p_buf, unsigned int len)
 181 {
 182   return ssl_read(p_sess, p_sess->p_control_ssl, p_buf, len);
 183 }