src/smtp.c

   1 /* smtp.c --- Implement SMTP profile of SASL login.
   2  * Copyright (C) 2002, 2003, 2004, 2005, 2007  Simon Josefsson
   3  *
   4  * This file is part of GNU SASL.
   5  *
   6  * This program 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 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
  18  *
  19  */
  20
  21 #include "smtp.h"
  22
  23 #define MAX_LINE_LENGTH BUFSIZ
  24
  25 int
  26 smtp_greeting (void)
  27 {
  28   char *in;
  29
  30   if (!readln (&in))
  31     return 0;
  32
  33   return 1;
  34 }
  35
  36 int
  37 smtp_has_starttls (void)
  38 {
  39   char *in, *capa;
  40   int has_tls = 0;
  41
  42   if (!writeln ("EHLO [127.0.0.1]"))
  43     return 0;
  44
  45   do
  46     {
  47       if (!readln (&in))
  48         return 0;
  49
  50 #define TLSGREETING "250-STARTTLS"
  51       if (strncmp (in, TLSGREETING, strlen (TLSGREETING)) == 0)
  52         has_tls = 1;
  53     }
  54   while (strncmp (in, "250 ", 4) != 0);
  55
  56   return has_tls;
  57 }
  58
  59 int
  60 smtp_starttls (void)
  61 {
  62   char *in;
  63
  64   if (!writeln ("STARTTLS"))
  65     return 0;
  66
  67   if (!readln (&in))
  68     return 0;
  69
  70   return 1;
  71 }
  72
  73 int
  74 smtp_select_mechanism (char **mechlist)
  75 {
  76   char *in;
  77
  78   if (args_info.server_flag)
  79     {
  80       if (!args_info.quiet_given)
  81         fprintf (stderr, _("Chose SASL mechanisms:\n"));
  82       if (!readln (&in))
  83         return 0;
  84       *mechlist = in;
  85     }
  86   else
  87     {
  88       if (!writeln ("EHLO [127.0.0.1]"))
  89         return 0;
  90
  91       do
  92         {
  93           if (!readln (&in))
  94             return 0;
  95
  96 #define GREETING "250-AUTH "
  97           if (strncmp (in, GREETING, strlen (GREETING)) == 0)
  98             *mechlist = in + strlen (GREETING);
  99         }
 100       while (strncmp (in, "250 ", 4) != 0);
 101     }
 102
 103   return 1;
 104 }
 105
 106 int
 107 smtp_authenticate (const char *mech)
 108 {
 109   if (args_info.server_flag)
 110     {
 111       if (!args_info.quiet_given)
 112         fprintf (stderr, _("Using mechanism:\n"));
 113       puts (mech);
 114     }
 115   else
 116     {
 117       char input[MAX_LINE_LENGTH];
 118
 119       sprintf (input, "AUTH %s", mech);
 120       if (!writeln (input))
 121         return 0;
 122     }
 123
 124   return 1;
 125 }
 126
 127 int
 128 smtp_step_send (const char *data)
 129 {
 130   char input[MAX_LINE_LENGTH];
 131
 132   if (args_info.server_flag)
 133     sprintf (input, "334 %s", data);
 134   else
 135     sprintf (input, "%s", data);
 136   if (!writeln (input))
 137     return 0;
 138
 139   return 1;
 140 }
 141
 142 int
 143 smtp_step_recv (char **data)
 144 {
 145   char *p;
 146
 147   if (!readln (data))
 148     return 0;
 149
 150   p = *data;
 151
 152   if (p[0] != '3' || p[1] != '3' || p[2] != '4' || p[3] != ' ')
 153     {
 154       fprintf (stderr, _("error: Server did not return expected SASL "
 155                          "data (it must begin with '334 '):\n%s\n"), p);
 156       return 0;
 157     }
 158
 159   memmove (&p[0], &p[4], strlen (p) - 3);
 160
 161   if (p[strlen (p) - 1] == '\n')
 162     p[strlen (p) - 1] = '\0';
 163   if (p[strlen (p) - 1] == '\r')
 164     p[strlen (p) - 1] = '\0';
 165
 166   return 1;
 167 }
 168
 169 int
 170 smtp_auth_finish (void)
 171 {
 172   char *in;
 173
 174   if (!readln (&in))
 175     return 0;
 176
 177   return 1;
 178 }
 179
 180 int
 181 smtp_logout (void)
 182 {
 183   char *in;
 184
 185   if (!writeln ("QUIT"))
 186     return 0;
 187
 188   /* read "221 2.0.0 foo closing ..." */
 189   if (!readln (&in))
 190     return 0;
 191
 192   free (in);
 193
 194   return 1;
 195 }