path: root/lib/libalpm/server.c

/*
 *  server.c
 * 
 *  Copyright (c) 2006 by Miklos Vajna <vmiklos@frugalware.org>
 * 
 *  This program 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.
 *
 *  This program 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 this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 
 *  USA.
 */

#include "config.h"

#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <libintl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <time.h>
#include <errno.h>
#include <download.h>

/* libalpm */
#include "server.h"
#include "alpm_list.h"
#include "error.h"
#include "log.h"
#include "alpm.h"
#include "util.h"
#include "handle.h"
#include "log.h"
#include "package.h"

pmserver_t *_alpm_server_new(const char *url)
{
  struct url *u;
  pmserver_t *server;

  ALPM_LOG_FUNC;

  server = (pmserver_t *)malloc(sizeof(pmserver_t));
  if(server == NULL) {
    _alpm_log(PM_LOG_ERROR, _("malloc failure: could not allocate %d bytes"), sizeof(pmserver_t));
    RET_ERR(PM_ERR_MEMORY, NULL);
  }

  memset(server, 0, sizeof(pmserver_t));
  u = downloadParseURL(url);
  if(!u) {
    _alpm_log(PM_LOG_ERROR, _("url '%s' is invalid, ignoring"), url);
    RET_ERR(PM_ERR_SERVER_BAD_URL, NULL);
  }
  if(strlen(u->scheme) == 0) {
    _alpm_log(PM_LOG_WARNING, _("url scheme not specified, assuming http"));
    strcpy(u->scheme, "http");
  }

  if(strcmp(u->scheme,"ftp") == 0 && strlen(u->user) == 0) {
    strcpy(u->user, "anonymous");
    strcpy(u->pwd, "libalpm@guest");
  }

  server->s_url = u;

  return server;
}

void _alpm_server_free(void *data)
{
  pmserver_t *server = data;

  ALPM_LOG_FUNC;

  if(server == NULL) {
    return;
  }

  /* free memory */
  downloadFreeURL(server->s_url);
  FREE(server);
}

/* remove filename info from "s_url->doc" and return it */
static char *strip_filename(pmserver_t *server)
{
  char *p = NULL, *fname = NULL;
  if(!server) {
    return(NULL);
  }

  p = strrchr(server->s_url->doc, '/');
  if(p && *(++p)) {
    fname = strdup(p);
    _alpm_log(PM_LOG_DEBUG, _("stripping '%s' from '%s'"), fname, server->s_url->doc);
    *p = 0;
  }

  /* s_url->doc now contains ONLY path information.  return value
   * if the file information from the original URL */
  return(fname);
}

/* Return a 'struct url' for this server, for downloading 'filename'. */
static struct url *url_for_file(pmserver_t *server, const char *filename)
{
  struct url *ret = NULL;
  char *doc = NULL;
  int doclen = 0;

  doclen = strlen(server->s_url->doc) + strlen(filename) + 2;
  doc = calloc(doclen, sizeof(char));
  if(!doc) {
    RET_ERR(PM_ERR_MEMORY, NULL);
  }

  snprintf(doc, doclen, "%s/%s", server->s_url->doc, filename);
  ret = downloadMakeURL(server->s_url->scheme,
                        server->s_url->host,
                        server->s_url->port,
                        doc,
                        server->s_url->user,
                        server->s_url->pwd);
  free(doc);
  return(ret);
}

/*
 * Download a list of files from a list of servers
 *   - if one server fails, we try the next one in the list
 *
 * RETURN:  0 for successful download, 1 on error
 */
int _alpm_downloadfiles(alpm_list_t *servers, const char *localpath, alpm_list_t *files)
{
  ALPM_LOG_FUNC;
  return(_alpm_downloadfiles_forreal(servers, localpath, files, NULL, NULL));
}

/*
 * This is the real downloadfiles, used directly by sync_synctree() to check
 * modtimes on remote files.
 *   - if *mtime1 is non-NULL, then only download files
 *     if they are different than *mtime1.  String should be in the form
 *     "YYYYMMDDHHMMSS" to match the form of ftplib's FtpModDate() function.
 *   - if *mtime2 is non-NULL, then it will be filled with the mtime
 *     of the remote file (from MDTM FTP cmd or Last-Modified HTTP header).
 * 
 * RETURN:  0 for successful download
 *          1 if the mtimes are identical
 *         -1 on error
 */
int _alpm_downloadfiles_forreal(alpm_list_t *servers, const char *localpath,
  alpm_list_t *files, const char *mtime1, char *mtime2)
{
  int dltotal_bytes = 0;
  alpm_list_t *lp;
  int done = 0;
  alpm_list_t *complete = NULL;
  alpm_list_t *i;

  ALPM_LOG_FUNC;

  if(files == NULL) {
    return(0);
  }

  for(i = servers; i && !done; i = i->next) {
    pmserver_t *server = i->data;

    /* get each file in the list */
    for(lp = files; lp; lp = lp->next) {
      struct url *fileurl = NULL;
      char realfile[PATH_MAX];
      char output[PATH_MAX];
      char *fn = (char *)lp->data;
      char pkgname[PKG_NAME_LEN];
      char *p;

      fileurl = url_for_file(server, fn);
      if(!fileurl) {
        return(-1);
      }

      /* Try to get JUST the name of the package from the filename */
      memset(pkgname, 0, PKG_NAME_LEN);
      if((p = strstr(fn, PM_EXT_PKG))) {
        _alpm_pkg_splitname(fn, pkgname, NULL, 1);
      }
      if(!strlen(pkgname)) {
        /* just use the raw filename if we can't find crap */
        STRNCPY(pkgname, fn, PKG_NAME_LEN+1);
      }
      _alpm_log(PM_LOG_DEBUG, _("using '%s' for download progress"), pkgname);

      snprintf(realfile, PATH_MAX, "%s%s", localpath, fn);
      snprintf(output, PATH_MAX, "%s%s.part", localpath, fn);

      if(alpm_list_find_str(complete, fn)) {
        continue;
      }

      if(!handle->xfercommand) {
        FILE *dlf, *localf = NULL;
        struct url_stat ust;
        struct stat st;
        int chk_resume = 0;

        if(stat(output, &st) == 0 && st.st_size > 0) {
          _alpm_log(PM_LOG_DEBUG, _("existing file found, using it"));
          fileurl->offset = (off_t)st.st_size;
          dltotal_bytes = st.st_size;
          localf = fopen(output, "a");
          chk_resume = 1;
        } else {
          fileurl->offset = (off_t)0;
          dltotal_bytes = 0;
        }
        
        /* libdownload does not reset the error code, reset it in the case of previous errors */
        downloadLastErrCode = 0;

        /* 10s timeout - TODO make a config option */
        downloadTimeout = 10000;

        /* Make libdownload super verbose... worthwhile for testing */
        if(alpm_option_get_logmask() & PM_LOG_DOWNLOAD) {
            downloadDebug = 1;
        }
        if(alpm_option_get_logmask() & PM_LOG_DEBUG) {
            dlf = downloadXGet(fileurl, &ust, (handle->nopassiveftp ? "v" : "vp"));
        } else {
            dlf = downloadXGet(fileurl, &ust, (handle->nopassiveftp ? "" : "p"));
        }

        if(downloadLastErrCode != 0 || dlf == NULL) {
          _alpm_log(PM_LOG_ERROR, _("failed retrieving file '%s' from %s : %s"),
                    fn, fileurl->host, downloadLastErrString);
          if(localf != NULL) {
            fclose(localf);
          }
          /* try the next server */
          continue;
        } else {
            _alpm_log(PM_LOG_DEBUG, _("connected to %s successfully"), fileurl->host);
        }
        
        if(ust.mtime && mtime1) {
          char strtime[15];
          _alpm_time2string(ust.mtime, strtime);
          if(strcmp(mtime1, strtime) == 0) {
            _alpm_log(PM_LOG_DEBUG, _("mtimes are identical, skipping %s"), fn);
            complete = alpm_list_add(complete, fn);
            if(localf != NULL) {
              fclose(localf);
            }
            if(dlf != NULL) {
              fclose(dlf);
            }
            return(1);
          }
        }
        
        if(ust.mtime && mtime2) {
          _alpm_time2string(ust.mtime, mtime2);
        }

        if(chk_resume && fileurl->offset == 0) {
          _alpm_log(PM_LOG_WARNING, _("cannot resume download, starting over"));
          if(localf != NULL) {
            fclose(localf);
            localf = NULL;
          }
        }

        if(localf == NULL) {
          _alpm_rmrf(output);
          fileurl->offset = (off_t)0;
          dltotal_bytes = 0;
          localf = fopen(output, "w");
          if(localf == NULL) { /* still null? */
            _alpm_log(PM_LOG_ERROR, _("cannot write to file '%s'"), output);
            if(dlf != NULL) {
              fclose(dlf);
            }
            return -1;
          }
        }

        /* Progress 0 - initialize */
        if(handle->dlcb) handle->dlcb(pkgname, 0, ust.size);

        int nread = 0;
        char buffer[PM_DLBUF_LEN];
        while((nread = fread(buffer, 1, PM_DLBUF_LEN, dlf)) > 0) {
          if(ferror(dlf)) {
            _alpm_log(PM_LOG_ERROR, _("error downloading '%s': %s"),
                      fn, downloadLastErrString);
            fclose(localf);
            fclose(dlf);
            return(-1);
          }
          
          int nwritten = 0;
          while(nwritten < nread) {
            nwritten += fwrite(buffer, 1, (nread - nwritten), localf);
            if(ferror(localf)) {
              _alpm_log(PM_LOG_ERROR, _("error writing to file '%s': %s"),
                        realfile, strerror(errno));
              fclose(localf);
              fclose(dlf);
              return(-1);
            }
          }

          if(nwritten != nread) {
            
          }
          dltotal_bytes += nread;

          if(handle->dlcb) handle->dlcb(pkgname, dltotal_bytes, ust.size);
        }

        fclose(localf);
        fclose(dlf);
        rename(output, realfile);
        complete = alpm_list_add(complete, fn);
      } else {
        int ret;
        int usepart = 0;
        char *ptr1, *ptr2;
        char origCmd[PATH_MAX];
        char parsedCmd[PATH_MAX] = "";
        char url[PATH_MAX];
        char cwd[PATH_MAX];

        /* build the full download url */
        snprintf(url, PATH_MAX, "%s://%s%s", fileurl->scheme, fileurl->host, fileurl->doc);

        /* replace all occurrences of %o with fn.part */
        strncpy(origCmd, handle->xfercommand, sizeof(origCmd));
        ptr1 = origCmd;
        while((ptr2 = strstr(ptr1, "%o"))) {
          usepart = 1;
          ptr2[0] = '\0';
          strcat(parsedCmd, ptr1);
          strcat(parsedCmd, output);
          ptr1 = ptr2 + 2;
        }
        strcat(parsedCmd, ptr1);
        /* replace all occurrences of %u with the download URL */
        strncpy(origCmd, parsedCmd, sizeof(origCmd));
        parsedCmd[0] = '\0';
        ptr1 = origCmd;
        while((ptr2 = strstr(ptr1, "%u"))) {
          ptr2[0] = '\0';
          strcat(parsedCmd, ptr1);
          strcat(parsedCmd, url);
          ptr1 = ptr2 + 2;
        }
        strcat(parsedCmd, ptr1);
        /* cwd to the download directory */
        getcwd(cwd, PATH_MAX);
        if(chdir(localpath)) {
          _alpm_log(PM_LOG_WARNING, _("could not chdir to %s"), localpath);
          return(PM_ERR_CONNECT_FAILED);
        }
        /* execute the parsed command via /bin/sh -c */
        _alpm_log(PM_LOG_DEBUG, _("running command: %s"), parsedCmd);
        ret = system(parsedCmd);
        if(ret == -1) {
          _alpm_log(PM_LOG_WARNING, _("running XferCommand: fork failed!"));
          return(PM_ERR_FORK_FAILED);
        } else if(ret != 0) {
          /* download failed */
          _alpm_log(PM_LOG_DEBUG, _("XferCommand command returned non-zero status code (%d)"), ret);
        } else {
          /* download was successful */
          complete = alpm_list_add(complete, fn);
          if(usepart) {
            rename(output, realfile);
          }
        }
        chdir(cwd);
      }
      downloadFreeURL(fileurl);
    }

    if(alpm_list_count(complete) == alpm_list_count(files)) {
      done = 1;
    }
  }

  return(done ? 0 : -1);
}

char *_alpm_fetch_pkgurl(char *target)
{
  pmserver_t *server;
  char *filename;
  struct stat st;

  ALPM_LOG_FUNC;

  server = _alpm_server_new(target);
  if(!server) {
    return(NULL);
  }

  /* strip path information from the filename */
  filename = strip_filename(server);
  if(!filename) {
    _alpm_log(PM_LOG_ERROR, _("URL does not contain a file for download"));
    return(NULL);
  }

  /* do not download the file if it exists in the current dir */
  if(stat(filename, &st) == 0) {
    _alpm_log(PM_LOG_DEBUG, _("%s has already been downloaded"), filename);
  } else {
    alpm_list_t *servers = alpm_list_add(NULL, server);
    alpm_list_t *files = alpm_list_add(NULL, filename);

    if(_alpm_downloadfiles(servers, "./", files)) {
      _alpm_log(PM_LOG_WARNING, _("failed to download %s"), target);
      return(NULL);
    }
    _alpm_log(PM_LOG_DEBUG, _("successfully downloaded %s"), filename);
    alpm_list_free(files);
    alpm_list_free(servers);
  }

  _alpm_server_free(server);

  /* return the target with the raw filename, no URL */
  return(filename);
}

/* vim: set ts=2 sw=2 noet: */