src/smtp.c

   1 /* smtp.c --- Implement SMTP profile of SASL login.
   2  * Copyright (C) 2002, 2003, 2004, 2005  Simon Josefsson
   3  *
   4  * This file is part of GNU SASL.
   5  *
   6  * GNU SASL is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * GNU SASL is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with GNU SASL; if not, write to the Free Software Foundation,
  18  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  19  *
  20  */
  21
  22 #include "smtp.h"
  23
  24 #define MAX_LINE_LENGTH BUFSIZ
  25
  26 int
  27 smtp_greeting (void)
  28 {
  29   char *in;
  30
  31   if (!readln (&in))
  32     return 0;
  33
  34   return 1;
  35 }
  36
  37 int
  38 smtp_has_starttls (void)
  39 {
  40   char *in, *capa;
  41   int has_tls = 0;
  42
  43   if (!writeln ("EHLO [127.0.0.1]"))
  44     return 0;
  45
  46   do
  47     {
  48       if (!readln (&in))
  49         return 0;
  50
  51 #define TLSGREETING "250-STARTTLS"
  52       if (strncmp (in, TLSGREETING, strlen (TLSGREETING)) == 0)
  53         has_tls = 1;
  54     }
  55   while (strncmp (in, "250 ", 4) != 0);
  56
  57   return has_tls;
  58 }
  59
  60 int
  61 smtp_starttls (void)
  62 {
  63   char *in;
  64
  65   if (!writeln ("STARTTLS"))
  66     return 0;
  67
  68   if (!readln (&in))
  69     return 0;
  70
  71   return 1;
  72 }
  73
  74 int
  75 smtp_select_mechanism (char **mechlist)
  76 {
  77   char *in;
  78
  79   if (args_info.server_flag)
  80     {
  81       if (!args_info.quiet_given)
  82         fprintf (stderr, _("Chose SASL mechanisms:\n"));
  83       if (!readln (&in))
  84         return 0;
  85       *mechlist = in;
  86     }
  87   else
  88     {
  89       if (!writeln ("EHLO [127.0.0.1]"))
  90         return 0;
  91
  92       do
  93         {
  94           if (!readln (&in))
  95             return 0;
  96
  97 #define GREETING "250-AUTH "
  98           if (strncmp (in, GREETING, strlen (GREETING)) == 0)
  99             *mechlist = in + strlen (GREETING);
 100         }
 101       while (strncmp (in, "250 ", 4) != 0);
 102     }
 103
 104   return 1;
 105 }
 106
 107 int
 108 smtp_authenticate (const char *mech)
 109 {
 110   if (args_info.server_flag)
 111     {
 112       if (!args_info.quiet_given)
 113         fprintf (stderr, _("Using mechanism:\n"));
 114       puts (mech);
 115     }
 116   else
 117     {
 118       char input[MAX_LINE_LENGTH];
 119
 120       sprintf (input, "AUTH %s", mech);
 121       if (!writeln (input))
 122         return 0;
 123     }
 124
 125   return 1;
 126 }
 127
 128 int
 129 smtp_step_send (const char *data)
 130 {
 131   char input[MAX_LINE_LENGTH];
 132
 133   if (args_info.server_flag)
 134     sprintf (input, "334 %s", data);
 135   else
 136     sprintf (input, "%s", data);
 137   if (!writeln (input))
 138     return 0;
 139
 140   return 1;
 141 }
 142
 143 int
 144 smtp_step_recv (char **data)
 145 {
 146   char *p;
 147
 148   if (!readln (data))
 149     return 0;
 150
 151   p = *data;
 152
 153   if (p[0] != '3' || p[1] != '3' || p[2] != '4' || p[3] != ' ')
 154     {
 155       fprintf (stderr, _("error: Server did not return expected SASL "
 156                          "data (it must begin with '334 '):\n%s\n"), p);
 157       return 0;
 158     }
 159
 160   memmove (&p[0], &p[4], strlen (p) - 3);
 161
 162   if (p[strlen (p) - 1] == '\n')
 163     p[strlen (p) - 1] = '\0';
 164   if (p[strlen (p) - 1] == '\r')
 165     p[strlen (p) - 1] = '\0';
 166
 167   return 1;
 168 }
 169
 170 int
 171 smtp_auth_finish (void)
 172 {
 173   char *in;
 174
 175   if (!readln (&in))
 176     return 0;
 177
 178   return 1;
 179 }
 180
 181 int
 182 smtp_logout (void)
 183 {
 184   char *in;
 185
 186   if (!writeln ("QUIT"))
 187     return 0;
 188
 189   /* read "221 2.0.0 foo closing ..." */
 190   if (!readln (&in))
 191     return 0;
 192
 193   free (in);
 194
 195   return 1;
 196 }