📄 ftp.c

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/* * Dpi for FTP. * * This server checks the ftp-URL to be a directory (requires wget). * If true, it sends back an html representation of it, and if not * a dpip message (which is catched by dillo who redirects the ftp URL * to the downloads server). * * Feel free to polish! * * Copyright 2003-2005 Jorge Arellano Cid <jcid@dillo.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. * *//* * TODO: * - Send feedback about the FTP login process from wget's stderr. *   i.e. capture our child's stderr, process it, and report back. * - Handle simultaneous connections. *   If ftp.dpi is implemented with a low level ftp library, it becomes *   possible to keep the connection alive, and thus make browsing of ftp *   directories faster (this avoids one login per page, and forks). Perhaps *   it's not worth, but can be done. */#include <unistd.h>#include <sys/types.h>#include <sys/socket.h>#include <sys/un.h>#include <stdio.h>#include <stdlib.h>#include <string.h>#include <signal.h>#include <sys/wait.h>#include <errno.h>#include <sys/time.h>#include <ctype.h>#include <glib.h>#include "../dpip/dpip.h"#include "dpiutil.h"/* * Debugging macros */#define _MSG(fmt...)#define MSG(fmt...)  g_printerr("[ftp dpi]: " fmt)/* * Global variables */static SockHandler *sh = NULL;char **dl_argv = NULL;/*---------------------------------------------------------------------------*//* TODO: could use dStr ADT! */typedef struct ContentType_ {   const char *str;   int len;} ContentType_t;static const ContentType_t MimeTypes[] = {   { "application/octet-stream", 24 },   { "text/html", 9 },   { "text/plain", 10 },   { "image/gif", 9 },   { "image/png", 9 },   { "image/jpeg", 10 },   { NULL, 0 }};/* * Detects 'Content-Type' from a data stream sample. * * It uses the magic(5) logic from file(1). Currently, it * only checks the few mime types that Dillo supports. * * 'Data' is a pointer to the first bytes of the raw data. * * Return value: (0 on success, 1 on doubt, 2 on lack of data). */int a_Misc_get_content_type_from_data(void *Data, size_t Size,                                       const char **PT){   int st = 1;      /* default to "doubt' */   int Type = 0;    /* default to "application/octet-stream" */   char *p = Data;   size_t i, non_ascci;   /* HTML try */   for (i = 0; i < Size && isspace(p[i]); ++i);   if ((Size - i >= 5  && !g_strncasecmp(p+i, "<html", 5)) ||       (Size - i >= 5  && !g_strncasecmp(p+i, "<head", 5)) ||       (Size - i >= 6  && !g_strncasecmp(p+i, "<title", 6)) ||       (Size - i >= 14 && !g_strncasecmp(p+i, "<!doctype html", 14)) ||       /* this line is workaround for FTP through the Squid proxy */       (Size - i >= 17 && !g_strncasecmp(p+i, "<!-- HTML listing", 17))) {      Type = 1;      st = 0;   /* Images */   } else if (Size >= 4 && !g_strncasecmp(p, "GIF8", 4)) {      Type = 3;      st = 0;   } else if (Size >= 4 && !g_strncasecmp(p, "\x89PNG", 4)) {      Type = 4;      st = 0;   } else if (Size >= 2 && !g_strncasecmp(p, "\xff\xd8", 2)) {      /* JPEG has the first 2 bytes set to 0xffd8 in BigEndian - looking       * at the character representation should be machine independent. */      Type = 5;      st = 0;   /* Text */   } else {      /* We'll assume "text/plain" if the set of chars above 127 is <= 10       * in a 256-bytes sample.  Better heuristics are welcomed! :-) */      non_ascci = 0;      Size = MIN (Size, 256);      for (i = 0; i < Size; i++)         if ((unsigned char) p[i] > 127)            ++non_ascci;      if (Size == 256) {         Type = (non_ascci > 10) ? 0 : 2;         st = 0;      } else {         Type = (non_ascci > 0) ? 0 : 2;      }   }   *PT = MimeTypes[Type].str;   return st;}/*---------------------------------------------------------------------------*//* * Build a shell command using wget for this URL. */static void make_wget_argv(gchar *url){   gchar *esc_url;   if (dl_argv) {      g_free(dl_argv[2]);      g_free(dl_argv);   }   dl_argv = g_new(gchar*, 10);   esc_url = Escape_uri_str(url, "'");   /* avoid malicious SMTP relaying with FTP urls */   Filter_smtp_hack(esc_url);   dl_argv[0] = "wget";   dl_argv[1] = "-O-";   dl_argv[2] = g_strdup(esc_url);   dl_argv[3] = NULL;/*   dl_argv[0] = "wget";   dl_argv[1] = "-t2";   dl_argv[2] = "-O-";   dl_argv[3] = g_strdup_printf("'%s'", esc_url);   dl_argv[4] = "2>/dev/null";   dl_argv[5] = NULL;*/   g_free(esc_url);}/* * Fork, exec command, get its output and send via stdout. * Return: Number of bytes transfered. */static gint try_ftp_transfer(gchar *url){#define MinSZ 256   ssize_t n;   gint nb, minibuf_sz;   const gchar *mime_type;   char buf[4096], minibuf[MinSZ], *d_cmd;   pid_t ch_pid;   gint aborted = 0;   int DataPipe[2];   if (pipe(DataPipe) < 0) {      MSG("pipe, %s\n", strerror(errno));      return 0;   }   /* Prepare args for execvp() */   make_wget_argv(url);   /* Start the child process */   if ((ch_pid = fork()) == 0) {      /* child */      /* start wget */      close(DataPipe[0]);      dup2(DataPipe[1], 1); /* stdout */      execvp(dl_argv[0], dl_argv);      _exit(1);   } else if (ch_pid < 0) {      perror("fork, ");      exit(1);   } else {         /* father continues below */      close(DataPipe[1]);   }   /* Read/Write the real data */   minibuf_sz = 0;   for (nb = 0; 1; nb += n) {      while ((n = read(DataPipe[0], buf, 4096)) < 0 && errno == EINTR);      if (n <= 0)         break;      if (minibuf_sz < MinSZ) {         memcpy(minibuf + minibuf_sz, buf, MIN(n, MinSZ - minibuf_sz));         minibuf_sz += MIN(n, MinSZ - minibuf_sz);         if (minibuf_sz < MinSZ)            continue;         a_Misc_get_content_type_from_data(minibuf, minibuf_sz, &mime_type);         if (strcmp(mime_type, "application/octet-stream") == 0) {            /* abort transfer */            kill(ch_pid, SIGTERM);            /* The "application/octet-stream" MIME type will be sent and             * Dillo will offer a download dialog */            aborted = 1;         }      }      if (nb == 0) {         /* Send dpip tag */         d_cmd = a_Dpip_build_cmd("cmd=%s url=%s", "start_send_page", url);         sock_handler_write_str(sh, d_cmd, 1);         g_free(d_cmd);         /* Send HTTP header. */         sock_handler_write_str(sh, "Content-type: ", 0);         sock_handler_write_str(sh, mime_type, 0);         sock_handler_write_str(sh, "\n\n", 1);      }      if (!aborted)         sock_handler_write(sh, buf, n, 0);   }   return nb;}/* * */int main(void){   gchar *dpip_tag = NULL, *cmd = NULL, *url = NULL, *url2 = NULL;   gint nb;   gchar *p, *d_cmd;   /* Initialize the SockHandler */   sh = sock_handler_new(STDIN_FILENO, STDOUT_FILENO, 8*1024);   /* wget may need to write a temporary file... */   chdir("/tmp");   /* Read the dpi command from STDIN */   dpip_tag = sock_handler_read(sh);   g_printerr("ftp.dpi::[%s]\n", dpip_tag);   cmd = a_Dpip_get_attr(dpip_tag, strlen(dpip_tag), "cmd");   url = a_Dpip_get_attr(dpip_tag, strlen(dpip_tag), "url");   if (!cmd || !url) {      g_printerr("ftp.dpi:: Error, cmd=%s, url=%s\n", cmd, url);      exit (EXIT_FAILURE);   }   if ((nb = try_ftp_transfer(url)) == 0) {      /* Transfer failed, the requested file may not exist or be a symlink       * to a directory. Try again... */      if ((p = strrchr(url, '/')) && p[1]) {         url2 = g_strconcat(url, "/", NULL);         nb = try_ftp_transfer(url2);      }   }   if (nb == 0) {      /* The transfer failed, let dillo know... */      d_cmd = a_Dpip_build_cmd("cmd=%s to_cmd=%s msg=%s",                               "answer", "open_url", "not a directory");      sock_handler_write_str(sh, d_cmd, 1);      g_free(d_cmd);   }   g_free(cmd);   g_free(url);   g_free(url2);   g_free(dpip_tag);   /* Finish the SockHandler */   sock_handler_close(sh);   sock_handler_free(sh);   return 0;}
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