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fileconfig.c

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/**
 * \file fileconfig.c
 * \brief This file parses the nbsmtprc file
 *
 * \author Fernando J. Pereda <ferdy@ferdyx.org>
 * \author Ricardo Cervera Navarro <ricardo@zonasiete.org>
 *
 * This is part of nbsmtp. nbsmtp is free software;
 * you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * nbsmtp is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with nbsmtp; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * See COPYING for details.
 */
#include <string.h>
#include <syslog.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <stdlib.h>
#include <errno.h>
#include <pwd.h>

#include "servinfo.h"
#include "nbsmtp.h"
#include "util.h"
#include "fileconfig.h"

#ifdef HAVE_SSL
#include "osx.h"
#endif

/**
 * \brief Parses a list of possible configuration files, this function is meant to
 * avoid another modules (such as original) having to deal with several fileconfig
 * calls
 *
 * \param[in]     read_syswide      Whether to read system-wide config file or not
 * \param[in]     read_localconf    Whether to read local config file or not
 * \param[out]    serverinfo  servinfo_t pointer to save data
 * \return 1 in case of error, otherwise 0
 */
00053 int fileconfig_parse_all(bool_t read_syswide, bool_t read_localconf, servinfo_t *serverinfo)
{
      struct passwd *user;
      char *relative_paths[] = {".nbsmtprc",".mutt/nbsmtprc",".nbsmtp/nbsmtprc",NULL};
      char **p;
      char *local_tmp_buf;
      int state = 2;          /* Initialize to 2 so it allows the for to be executed */
#ifdef HAVE_OSX
      char *osx_current_location;
#endif

      if (read_syswide)
      {
            /* First of all parse system-wide config file */
            asprintf(&local_tmp_buf,"%s/nbsmtprc",SYSCONFDIR);
            if (fileconfig_parse(local_tmp_buf,serverinfo)==1)
            {
                  perror("fileconfig_parse");
                  return 1;
            }
            free(local_tmp_buf);
      }

      if (read_localconf)
      {
            /* Initialize user info */
            user = getpwuid(getuid());

            /* Then read local config files */
            for ( p = relative_paths ; *p && state==2 ; p++ )
            {
                  asprintf(&local_tmp_buf,"%s/%s",user->pw_dir,*p);
                  state = fileconfig_parse(local_tmp_buf,serverinfo);
                  free(local_tmp_buf);

                  if (state==1)
                  {
                        perror("fileconfig_parse");
                        return 1;
                  }
            }

#ifdef HAVE_OSX
            /* Get current OSX network location */
            osx_current_location = osx_location();
            /* Build the path and parse the config */
            asprintf(&local_tmp_buf,"%s/.nbsmtp/%s",user->pw_dir,osx_current_location);
            state = fileconfig_parse(local_tmp_buf,serverinfo);
            
            /* Free the buffers */
            free(osx_current_location);
            free(local_tmp_buf);

            if (state==1)
            {
                  perror("fileconfig_parse");
                  return 1;
            }
            else if (state==2)
            {
                  /*
                   * No such file or directory so read the default config file.
                   * build the string,
                   * parse the file
                   * and free the buffer
                   */
                  asprintf(&local_tmp_buf,"%s/.nbsmtp/default",user->pw_dir);
                  state = fileconfig_parse(local_tmp_buf,serverinfo);
                  free(local_tmp_buf);

                  if (state==1)
                  {
                        perror("fileconfig_parse");
                  }
            }
#endif
      }

      return 0;
}

/**
 * \brief Parses the configuration file
 *
 * \param[in]     path        Where to find the config file
 * \param[out]    serverinfo  servinfo_t struct to store the values
 * \return 1 in case of error, 2 if file not found, otherwise 0
 */
00141 int fileconfig_parse(const char *path,servinfo_t *serverinfo)
{
      const char *sep = "\n\t =";
      char buf[BUF_SIZE];
      char *tempo, *opts[2], **p;
      FILE *fd;
#ifndef HAVE_STRSEP
      char *token;
#endif

      if ((fd = fopen(path,"r"))==NULL)
      {
            /* No such file or directory */
            if (errno==ENOENT)
            {
                  return 2;
            }
            perror("open");
            return 1;
      }

      while(fgets(buf,sizeof(buf),fd))
      {
            /* Strip comments and malformed lines */
            if (buf[0]=='#')
            {
                  continue;
            }
            else if ((tempo = strchr(buf,'#')))
            {
                  *tempo = (char)NULL;
            }
            else if(strchr(buf,'=') == (char*)NULL)
            {
                  continue;
            }

            /* Set helper pointers */
            p = opts;
            tempo = buf;

            /*
             * We store both parts (key/value) on opts[]. We are
             * also good enough to make a version using strtok for
             * those 'weak' OSes with no strsep().
             */
#ifdef HAVE_STRSEP
            while((*p = strsep(&tempo,sep))!=NULL)
            {
                  if (**p!='\0' && ++p >= &opts[2])
                  {
                        break;
                  }
            }
#else
            for ( token = strtok(tempo,sep) ; token ; token = strtok(NULL,sep) )
            {
                  *(p++) = token;
            }
#endif

            /* Avoid segfault in case of opts[1] being NULL */
            if (opts[1]==NULL)
            {
                  log_msg(LOG_WARNING,"Empty option [%s] in %s",opts[0],path);
                  continue;
            }

            /* And finally we check for the var */
            if CHECK_OPTION("relayhost")
            {
                  SERVINFO_RELEASE_OPTION(serverinfo->host);
                  serverinfo->host = (char*)strdup(opts[1]);
            }
            else if CHECK_OPTION("fromaddr")
            {
                  SERVINFO_RELEASE_OPTION(serverinfo->fromaddr);
                  serverinfo->fromaddr = (char*)strdup(opts[1]);
            }
            else if CHECK_OPTION("domain")
            {
                  SERVINFO_RELEASE_OPTION(serverinfo->domain);
                  serverinfo->domain = (char*)strdup(opts[1]);
            }
            else if CHECK_OPTION("auth_user")
            {
                  SERVINFO_RELEASE_OPTION(serverinfo->auth_user);
                  serverinfo->auth_user = (char*)strdup(opts[1]);
            }
            else if CHECK_OPTION("auth_pass")
            {
                  SERVINFO_RELEASE_OPTION(serverinfo->auth_pass);
                  serverinfo->auth_pass = (char*)strdup(opts[1]);
            }
            else if CHECK_OPTION("auth_mech")
            {
                  if (strlen(opts[1])==1)
                  {
                        log_msg(LOG_WARNING,"Setting auth_mech with a single character is " \
                                    "discouraged and will be removed soon. Please take a look " \
                                    "at nbsmtprc(5) to see the new format.");

                        switch(*opts[1])
                        {
                              case 'l':
                                    serverinfo->auth_mech = SASL_LOGIN;
                                    break;
                              case 'p':
                                    serverinfo->auth_mech = SASL_PLAIN;
                                    break;
                              case 'c':
#ifdef HAVE_SSL
                                    serverinfo->auth_mech = SASL_CRAMMD5;
#else
                                    log_msg(LOG_WARNING,"CRAMMD5 only available when SSL compiled into nbSMTP, using default mechanism");
                                    serverinfo->auth_mech = SASL_DEFAULT;
#endif
                              default:
                                    serverinfo->auth_mech = SASL_DEFAULT;
                                    break;
                        }
                  }
                  else
                  {
                        if CHECK_VALUE("plain")
                        {
                              serverinfo->auth_mech = SASL_PLAIN;
                        }
                        else if CHECK_VALUE("login")
                        {
                              serverinfo->auth_mech = SASL_LOGIN;
                        }
                        else if (CHECK_VALUE("crammd5") || CHECK_VALUE("cram-md5"))
                        {
#ifdef HAVE_SSL
                              serverinfo->auth_mech = SASL_CRAMMD5;
#else
                              log_msg(LOG_WARNING,
                                          "CRAM-MD5 only available when compiled with SSL, using " \
                                          "default mechanism");
                              serverinfo->auth_mech = SASL_DEFAULT;
#endif
                        }
                        else
                        {
                              log_msg(LOG_WARNING,"Unknown auth_mech, setting to default value");
                              serverinfo->auth_mech = SASL_DEFAULT;
                        }
                  }
            }
            else if CHECK_OPTION("port")
            {
                  serverinfo->port = atoi(opts[1]);
            }
            else if CHECK_OPTION("use_tls")
            {
#ifdef HAVE_SSL
                  if CHECK_TRUE()
                  {
                        serverinfo->use_tls = True;
                  }
                  else if CHECK_FALSE()
                  {
                        serverinfo->use_tls = False;
                  }
#else
                  log_msg(LOG_WARNING,"SSL support not compiled into nbSMTP, ignoring use_tls");
#endif
            }
            else if CHECK_OPTION("use_starttls")
            {
#ifdef HAVE_SSL
                  if CHECK_TRUE()
                  {
                        serverinfo->use_starttls = True;
                        serverinfo->use_tls = True;
                  }
                  else if CHECK_FALSE()
                  {
                        serverinfo->use_starttls = False;
                  }
#else
                  log_msg(LOG_WARNING,"SSL support not compiled into nbSMTP, ignoring use_starttls");
#endif
            }
            else if CHECK_OPTION("debug")
            {
                  debug = atoi(opts[1]);
            }
            else
            {
                  log_msg(LOG_WARNING,"Unknown option [%s]",opts[0]);
            }
      }

      fclose(fd);

      return 0;
}

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