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<hr><p align="left"><small>发信人: Suning (资优生＋干苦力), 信区: LINUX <br>
标 题: 一个简明的断点续传程序 <br>
发信站: 武汉白云黄鹤站 (Sat Sep 16 10:59:28 2000), 转信 <br>
<br>
一个简明的断点续传程序. <br>
<br>
发信站: BBS 水木清华站 (Wed Apr 26 00:14:44 2000) <br>
/* Get and Resume Elite EDition source code Ver .4 (Uh huh!) <br>
First off, sorry about the mess and lack of error checking.. <br>
I'll clean it up later ;) <br>
Get and Resume Elite EDition (GREED) <br>
Copyright (C) 1999 Anoakie Turner <br>
This program is free software; you can redistribute it and/or modify <br>
it under the terms of the GNU General Public License as published by <br>
the Free Software Foundation; either version 2 of the License, or <br>
(at your option) any later version. <br>
This program is distributed in the hope that it will be useful, <br>
but WITHOUT ANY WARRANTY; without even the implied warranty of <br>
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the <br>
GNU General Public License for more details. <br>
You should have received a copy of the GNU General Public License <br>
along with this program; if not, write to the Free Software <br>
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. <br>
For more information on the GPL, please go to: <br>
http://www.gnu.org/copyleft/gpl.html <br>
Contact: Anoakie Turner <br>
Anoakie.Turner@asu.edu <br>
13240 N. 94th Pl. <br>
Scottsdale, AZ 85260 <br>
*/ <br>
/* <br>
** To compile, use g++ -O -Wall -o greed greed.cpp <br>
*/ <br>
#include <stdio.h> <br>
#include <sys/socket.h> <br>
#include <netinet/in.h> <br>
#include <netdb.h> <br>
#include <unistd.h> <br>
#include <string.h> <br>
#include <stdlib.h> <br>
#include <time.h> <br>
#define HTTP 1 <br>
#define FTP 2 <br>
#define CURRENT_VERSION "GREED/0.4" <br>
#define GGR "http://www.public.asu.edu/~arturner/greed.tar.gz" <br>
#define GGRS "http://www.public.asu.edu/~arturner/greed-source.tar.gz" <br>
#define rollback 4096 <br>
int dlstat; <br>
long dldots; <br>
struct sockaddr_in address; <br>
unsigned int dport; <br>
time_t start, end; <br>
struct URLstruct; <br>
typedef struct URLstruct* URLp; <br>
struct URLstruct <br>
{ char server[512]; <br>
char file[512]; <br>
char name[1024]; <br>
char filename[256]; <br>
char user[64]; <br>
char pass[64]; <br>
char left[10]; <br>
char size[10]; <br>
char total[12]; <br>
char cport[5]; <br>
unsigned int port; <br>
int protocol; <br>
int sockfd; <br>
struct hostent *host; <br>
struct servent *serv; <br>
long long lleft; <br>
long long lsize; <br>
long long ltotal; <br>
FILE *fp; <br>
bool done; <br>
bool resume; <br>
bool retry; <br>
} URLst; <br>
void Download(URLp URL); <br>
bool ReadHTTPHeader(URLp URL); <br>
bool ReadFTPListing(URLp URL); <br>
bool Parse(URLp URL); <br>
bool Connect(URLp URL); <br>
void ReadString(char *str1, int *ind, char stopchar, int stopint, char* str2 <br>
); <br>
void ReadString(char *str1, int &ind, char stopchar, int stopint, char* str2 <br>
) <br>
////////////////////////////////////// <br>
// void ReadString(char *str1, int &ind, char stopchar, <br>
// int stopint, char* str2); <br>
// <br>
// Pre: Assigned (str1) && Assigned (ind) && Assigned (stopchar) <br>
// && Assigned (stopint) <br>
// Post: a string starting at ind and ending at (stopchar || <br>
// stopint) is copied int str2 <br>
////////////////////////////////////// <br>
{ int stringIndex = 0; <br>
for (; ind < stopint && str1[ind] != stopchar; ind++) <br>
str2 [stringIndex++] = str1[ind]; <br>
str2 [stringIndex] = '\0'; <br>
} <br>
bool Parse(URLp URL) <br>
////////////////////////////////////// <br>
// bool Parse(URLp URL); <br>
// <br>
// Parses a URL <br>
// <br>
// Pre: Assigned (URL->name) <br>
// Post: URL->name parsed, URL->(filename, file, protocol, user, pass, cport <br>
, seerver, port) <br>
// set. Returns 1 if successful. <br>
////////////////////////////////////// <br>
{ int at = 0; <br>
int i = 0; <br>
dlstat = 0; <br>
dldots = 0; <br>
URL->retry = 0; <br>
for(i = strlen(URL->name); i > 0 && URL->name[i] != '@'; i--); <br>
if(URL->name[i] == '@') at = i; <br>
if (strstr(URL->name, "http://") != NULL || strstr(URL->name, "ftp:/ <br>
/") != NULL) <br>
{ if(URL->name[0] == 'f') <br>
{ i = 6; <br>
URL->protocol = FTP; <br>
} <br>
else <br>
{ i = 7; <br>
URL->protocol = HTTP; <br>
} <br>
if (at) <br>
{ ReadString(URL->name, i, ':', at, URL->user); <br>
i++,ReadString(URL->name, i, '\0', at, URL->pass); <br>
i++; <br>
} <br>
else <br>
{ strcpy(URL->user, "anonymous"); <br>
strcpy(URL->pass, "-anonuser@anonymous.com"); <br>
} <br>
} else <br>
{ i = 0; <br>
if(URL->name[0] == 'f') <br>
URL->protocol = FTP; <br>
else <br>
URL->protocol = HTTP; <br>
} <br>
at = i; <br>
ReadString(URL->name, i, ':', strlen(URL->name), URL->server); <br>
if (URL->name[i] != ':') <br>
{ i = at; <br>
ReadString(URL->name, i, '/', strlen(URL->name), URL->server <br>
); <br>
if (URL->protocol == FTP) <br>
strcpy (URL->cport, "21"); <br>
else <br>
strcpy (URL->cport, "80"); <br>
} <br>
else <br>
i++,ReadString(URL->name, i, '/', strlen(URL->name), URL->cp <br>
ort) <br>
ReadString(URL->name, i, '\0', strlen(URL->name), URL->file); <br>
for (i = strlen(URL->name); i > 0 && URL->name[i] != '/'; i--); <br>
i++,ReadString(URL->name, i, '\0', strlen(URL->name), URL->filename) <br>
; <br>
if (URL->file[0] == '\0') <br>
{ strcpy (URL->file, "/"); <br>
strcpy (URL->filename, "index.html"); <br>
} else if (URL->file[strlen(URL->file) - 1] == '/') <br>
strcpy (URL->filename, "index.html"); <br>
URL->port = atoi(URL->cport); <br>
return (1); <br>
} <br>
bool Connect(URLp URL) <br>
////////////////////////////////////// <br>
// <br>
// <br>
// <br>
// <br>
// <br>
////////////////////////////////////// <br>
{ URL->host = gethostbyname(URL->server); <br>
if (URL->host == NULL) <br>
{ printf("Error resolving host!\n"); <br>
return(0); <br>
} <br>
printf("Connecting to: %s:%d\n", URL->server, URL->port); <br>
URL->sockfd = socket(AF_INET, SOCK_STREAM, 0); <br>
if (URL->sockfd == -1) <br>
{ printf("Error opening socket to server\n"); <br>
return(0); <br>
} <br>
address.sin_family = AF_INET; <br>
address.sin_port = htons(URL->port); <br>
memcpy(&address.sin_addr, URL->host->h_addr, URL->host->h_length); <br>
if(connect(URL->sockfd, (struct sockaddr *)&address, sizeof(address) <br>
) < 0) <br>
{ printf("Error in connecting to server!\n"); <br>
return(0); <br>
} else <br>
if (URL->protocol == HTTP) <br>
{ write(URL->sockfd, "GET ", 4); <br>
write(URL->sockfd, URL->file, strlen(URL->file)); <br>
write(URL->sockfd, " HTTP/1.1\r\nHost: ", 17); <br>
write(URL->sockfd, URL->server, strlen(URL->server)); <br>
write(URL->sockfd, ":", 1); <br>
write(URL->sockfd, URL->cport, strlen(URL->cport)); <br>
write(URL->sockfd, "\r\nUser-Agent: ", 14); <br>
write(URL->sockfd, CURRENT_VERSION, strlen(CURRENT_VERSION)) <br>
; <br>
write(URL->sockfd, "\r\nAccept: *.*, */*\r\n", 20); <br>
write(URL->sockfd, "Range: bytes=", 13); <br>
} else <br>
{ write(URL->sockfd, "USER ", 5); <br>
write(URL->sockfd, URL->user, strlen(URL->user)); <br>
write(URL->sockfd, "\r\nPASS ", 7); <br>
write(URL->sockfd, URL->pass, strlen(URL->pass)); <br>
write(URL->sockfd, "\r\nPASV\r\nREST 0\r\n", 16); <br>
write(URL->sockfd, "NOOP\r\n", 6); <br>
URL->resume = 1; <br>
if (strstr(URL->user, "anonymous") != NULL) <br>
write(URL->sockfd, "LIST -L ", 8); <br>
else <br>
write(URL->sockfd, "LIST -L ~", 9); <br>
write(URL->sockfd, URL->file, strlen(URL->file)); <br>
write(URL->sockfd, "\r\n", 2); <br>
} <br>
return 1; <br>
} <br>
bool ReadHTTPHeader(URLp URL) <br>
////////////////////////////////////// <br>
// bool ReadHTTPHeader(URLp URL) <br>
// <br>
// URL->protcol == HTTP, HTTP header read. <br>
// <br>
// Pre: Assigned(URL->size) && Assigned(URL->filename) && Assigned(URL->soc <br>
kfd) <br>
// Post: URL->fp, URL->lsize, URL->left, and URL->lleft set. Returns 1 <br>
// if successful <br>
////////////////////////////////////// <br>
{ int bsize = 0; <br>
char *temp, *fin; <br>
char buffer[4096]; <br>
int i; <br>
URL->done = 0; <br>
URL->fp = fopen (URL->filename, "a+b"); <br>
URL->lsize = ftell(URL->fp); <br>
if ((URL->lsize >= URL->ltotal) && URL->ltotal != 0) <br>
{ printf("Error... It seems this file has already been downloa <br>
ded..\n"); <br>
return(0); <br>
} else <br>
if (URL->fp == NULL) <br>
{ printf("Error opening file %s\n", URL->filename); <br>
return(0); <br>
} else <br>
if (URL->lsize == -1) <br>
URL->lsize = 0; <br>
sprintf(URL->size, "%lld", URL->lsize); <br>
write(URL->sockfd, URL->size, strlen(URL->size)); <br>
write(URL->sockfd, "-\r\n\r\n", 5); <br>
dldots = URL->lsize / rollback; <br>
bsize = read(URL->sockfd, buffer, sizeof(buffer) - 1); <br>
if (!(fin=strstr(buffer,"\r\n\r\n"))) <br>
{ printf("Error - webserver headers too large, fatal!\n"); <br>
return(0); <br>
} <br>
*fin='\0'; fin+=4; <br>
if (strstr(buffer,"Transfer-Encoding: chunked")) <br>
{ printf("Error - \"chunked\" Transfer-Encoding not implemente <br>
d, II'm violating HTTP 1.1!\n"); <br>
return(0); <br>
} <br>
if (URL->lsize && !strstr(buffer,"Content-Range:")) <br>
{ printf("Error - server says we already have the completed fi <br>
le, resuming too dangerous!\n"); <br>
return(0); <br>
} <br>
printf("Resuming from %s bytes.\r\n", URL->size); <br>
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