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分类: C/C++

2015-06-12 18:34:57

原文地址:C语言 HTTP 下载文件 作者:tjwangzhen

       C语言 HTTP协议下载文件,实现断点续传,socket通讯,目前只支持ip和port方式连接,有兴趣的读者可完善域名方式。
      代码分为 http.c: 实现http协议下载文件 ,socket.c: 封装linux socket函数,移植时只需修改socket.c中的函数即可。
     希望对大家有帮助,本人亲测可用!
http.c

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  1. //http.c
  2. //作者:王振
  3. #include <stdio.h>
  4. #include <stdlib.h>
  5. #include <errno.h>
  6. #include <string.h>

  7. #include <sys/types.h>
  8. #include <sys/stat.h>
  9. #include <fcntl.h>

  10. #include "socket.h"
  11. #include "http.h"


  12. #define MAX_RECV_SIZE    1440//硬件单包最大的接收字节数
  13. char g_host[URL_LEN];
  14. char g_ip[URL_LEN+1];//ip/域名
  15. char g_port[5+1];

  16. char g_buf_send[4*1024];//发送数据暂存区
  17. char g_buf_recv[10*1024];//接收数据暂存区

  18. BreakPoint_ST g_break_point;

  19. /*
  20. 功能:判断断点有效性,现在校验url是否一致
  21. 参数:
  22. 返回:
  23. >0---------有效,已下载文件大小
  24. -1----------无效
  25. */
  26. int Get_Breakpoint_Available(BreakPoint_ST *breakpoint,char *url,char *file_crc)
  27. {
  28.     
  29.     //判断断点是否有效,后续加入文件校验码
  30.     if((memcmp(breakpoint->url,url,strlen(url))== 0)&&(breakpoint->recv_size== MAX_RECV_SIZE))
  31.         return breakpoint->download_size;
  32.     else
  33.     {
  34.         return -1;
  35.     }
  36.     
  37. }


  38. /*
  39. 功能:判断要下载文件是否存在断点
  40. 参数:
  41. filename---要下载的文件名
  42. file_crc----服务器返回下载文件的校验码
  43. 返回:
  44. 0---------无断点
  45. >0--------有断点,已下载文件大小
  46. */
  47. int Get_Breakpoint(char *url,char *filename,char *file_crc)
  48. {
  49.     char filename_bp[64];
  50.     int fd = -1;
  51.     int ret;
  52.     BreakPoint_ST break_point;
  53.     
  54.     //断点文件名 filename+bp
  55.     sprintf(filename_bp,"%s.bp",filename);

  56.     //检测是否存在filename断点文件
  57.     fd = open(filename_bp,O_RDONLY,S_IRUSR|S_IWUSR);
  58.     if(fd == -1)
  59.     {    
  60.         #ifdef DEBUG_HTTP
  61.         printf("no exsit %s\n",filename_bp);
  62.         #endif
  63.         return 0;
  64.     }

  65.     //存在断点
  66.     ret = read(fd,&break_point,sizeof(break_point));
  67.     if(ret != sizeof(break_point))
  68.     {
  69.         perror("ERR:Get_Breakpoint read");
  70.         exit(-1);
  71.     }

  72.     close(fd);

  73.     //判断断点是否有效
  74.     ret = Get_Breakpoint_Available(&break_point,url,file_crc);
  75.     if(ret > 0)
  76.         return ret;
  77.     else
  78.     {
  79.         
  80.         printf("%s not available\n",filename_bp);
  81.         remove(filename);
  82.         remove(filename_bp);
  83.         return 0;
  84.         
  85.     }
  86. }

  87. /*
  88. 功能:保存断点信息,文件名filename.bp
  89. 参数:
  90. filename---要下载的文件名
  91. file_crc----服务器返回下载文件的校验码
  92. 返回:
  93. 0---------成功
  94. >0--------有断点,已下载文件大小
  95. */
  96. int Save_Breakpoint(char *url,char *filename,int download_size,char *file_crc)
  97. {
  98.     int fd;
  99.     BreakPoint_ST breakpoint;
  100.     char filename_bp[128];//断点信息文件名,包含路径

  101.     sprintf(filename_bp,"%s.bp",filename);
  102.     /* 创建目的文件 */
  103.     if((fd=open(filename_bp,O_WRONLY|O_CREAT,S_IRUSR|S_IWUSR))==-1)
  104.     {
  105.         fprintf(stderr,"Open %s Error:%s\n",filename_bp,strerror(errno));
  106.         exit(1);
  107.     }
  108.     memset(&breakpoint,0x0,sizeof(breakpoint));
  109.     strcpy(breakpoint.url,url);
  110.     //strcpy(breakpoint.crc,file_crc);
  111.     strcpy(breakpoint.filename,filename);
  112.     breakpoint.download_size = download_size;
  113.     breakpoint.recv_size= MAX_RECV_SIZE;
  114.     
  115.     //xu tioa zheng wei fen ci xie ru
  116.     if(write(fd,&breakpoint,sizeof(breakpoint)) != sizeof(breakpoint))
  117.     {
  118.         perror("ERR:Save_Breakpoint");
  119.         exit(1);
  120.     }

  121.     close(fd);

  122.     return 0;



  123. }

  124. /*
  125. 功能:保存文件,追加写
  126. 参数:
  127. 返回:
  128. 0---------成功
  129. */

  130. int Save_File(char *filebuf,int filelength,char *filename)
  131. {
  132.     int fd;
  133.     /* 创建目的文件追加写 */
  134.     if((fd=open(filename,O_WRONLY|O_CREAT|O_APPEND,S_IRUSR|S_IWUSR))==-1)
  135.     {
  136.         fprintf(stderr,"Open %s Error:%s\n",filename,strerror(errno));
  137.         exit(1);
  138.     }
  139.     //xu tioa zheng wei fen ci xie ru
  140.     if(write(fd,filebuf,filelength) != filelength)
  141.     {
  142.         perror("ERR:Save_File");
  143.         exit(1);
  144.     }

  145.     close(fd);

  146.     return 0;


  147. }

  148.  
  149. int HTTP_GetResponseCode(void)
  150. {
  151.  
  152.  
  153. }

  154.  /*
  155. 功能:读取http返回的协议实体主体长度
  156. 参数:
  157. revbuf--------接收到的返回值
  158. 返回值:
  159. >=0---------内容(实体主体)的长度
  160. -1-----------数据返回错误
  161. */
  162. int HTTP_GetRecvLength(char *revbuf)
  163. {
  164.     char *p1 = NULL;
  165.     int HTTP_Body = 0;//内容体长度
  166.     int HTTP_Head = 0;//HTTP 协议头长度


  167.     HTTP_Body = HTTP_GetContentLength(revbuf);
  168.     if(HTTP_Body == -1)
  169.         return -1;

  170.     p1=strstr(revbuf,"\r\n\r\n");
  171.     if(p1==NULL)
  172.         return -1;
  173.     else
  174.     {
  175.         HTTP_Head = p1- revbuf +4;// 4是\r\n\r\n的长度
  176.         return HTTP_Body+HTTP_Head;
  177.     }


  178. }


  179. /*
  180. 功能:读取http返回的Content-Length长度
  181. 参数:
  182. revbuf--------接收到的数据
  183. 返回值:
  184. >=0---------Content-Length长度
  185. -1-----------数据返回错误
  186. */
  187. int HTTP_GetContentLength(char *revbuf)
  188. {
  189.     char *p1 = NULL, *p2 = NULL;
  190.     int HTTP_Body = 0;//内容体长度

  191.     p1 = strstr(revbuf,"Content-Length");
  192.     if(p1 == NULL)
  193.         return -1;
  194.     else
  195.     {
  196.         p2 = p1+strlen("Content-Length")+ 2;
  197.         HTTP_Body = atoi(p2);
  198.         return HTTP_Body;
  199.     }

  200. }

  201.  /*
  202.  功能:
  203.  参数:
  204.  sockfd--------接收到的返回值
  205.  返回值:
  206.  >0---------接收到长度
  207.  -1----------失败
  208.  =0---------服务端断开连接
  209.  注:内部接收缓冲10k
  210.  */

  211. int HTTP_Recv(int sockfd,char *buf_recv)
  212. {
  213.     int ret;
  214.     int recvlen=0;
  215.     int downloadlen = 0;
  216.     //int contentlen=0;
  217.     char buf_recv_tmp[10*1024+1];
  218.     
  219.     memset(buf_recv_tmp,0x0,sizeof(buf_recv_tmp));
  220.     while(1)
  221.     {
  222.         ret = Recv(sockfd,buf_recv_tmp+recvlen,sizeof(buf_recv_tmp)-1,0);

  223.         if(ret <= 0)//下载失败
  224.         {
  225.             perror("ERR:recv fail");
  226.             return ret;
  227.         }
  228.     
  229.     
  230.         if(recvlen == 0)
  231.         {
  232.             #ifdef DEBUG_HTTP_RECV
  233.             printf("recv len = %d\n", ret);
  234.              printf("recv = %s\n", buf_recv_tmp);
  235.             #endif
  236.             //获取需要下载长度;
  237.             downloadlen = HTTP_GetRecvLength(buf_recv_tmp);


  238.             #ifdef DEBUG_HTTP_RECV
  239.             printf("downloadlen = %d\n",downloadlen);
  240.             #endif
  241.         }

  242.         recvlen += ret;
  243.         #ifdef DEBUG_HTTP_RECV
  244.         printf("total recvlen = %d\n",recvlen);
  245.         #endif

  246.         if(downloadlen == recvlen)//下载完成
  247.             break;


  248.     }
  249.     memcpy(buf_recv,buf_recv_tmp,downloadlen);
  250.     return recvlen;

  251. }

  252. /*
  253. 功能:获取下载url中的文件名,最后一个/后的字符
  254. 参数:
  255. 返回值:
  256. 0-----------成功
  257. -1----------失败
  258. :内部接收缓冲10k
  259. */

  260. int HTTP_GetFileName(char *url,char *filename)
  261. {
  262.     //提取url中最后一个/后的内容
  263.     int len;
  264.     int i;

  265.     len = strlen(url);
  266.     for(i=len-1;i>0;i--)
  267.     {
  268.         if(url[i] == '/')
  269.             break;
  270.     }
  271.     if(i == 0)//下载地址错误
  272.     {
  273.         printf("url not contain '/'\n");
  274.         return -1;
  275.     }
  276.     else
  277.     {
  278.     
  279.         strcpy(filename,url+i+1);
  280.         #ifdef DEBUG_HTTP
  281.         printf("filename=%s\n",filename);
  282.         #endif
  283.         return 0;
  284.     }
  285. }

  286. /*
  287. 功能:获取下载url中的路径,第一个/后的字符
  288. 参数:
  289. 返回值:
  290. 0-----------成功
  291. -1----------失败
  292. :url ex ""
  293. */
  294. int HTTP_GetPath(char *url,char *path)
  295. {
  296.     char *p;

  297.     p = strstr(url,"http://");
  298.     if(p == NULL)
  299.     {
  300.         p = strchr(url,'/');
  301.         if(p == NULL)
  302.             return -1;
  303.         else
  304.         {
  305.             strcpy(path,p);
  306.             return 0;
  307.         }
  308.     }
  309.     else
  310.     {
  311.         p = strchr(url+strlen("http://"),'/');
  312.         if(p == NULL)
  313.             return -1;
  314.         else
  315.         {
  316.             strcpy(path,p);
  317.             return 0;
  318.         }
  319.     }

  320. }
  321. /*
  322. 功能:获取下载url中的ip和port,ip支持域名,端口默认为80
  323. 参数:
  324. 返回值:
  325. 1-----------域名式
  326. 2-----------ip port式
  327. -1----------失败
  328. :url ex ""
  329. */

  330. int HTTP_Get_IP_PORT(char *url,char *ip,char *port)
  331. {
  332.     char *p = NULL;
  333.     int offset = 0;
  334.     char DOMAIN_NAME[128];

  335.     p = strstr(url,"http://");
  336.     if(p == NULL)
  337.     {
  338.         offset = 0;
  339.     }
  340.     else
  341.     {
  342.         offset = strlen("http://");
  343.     }

  344.     p = strchr(url+offset,'/');
  345.     if(p == NULL)
  346.     {
  347.         printf("url:%s format error\n",url);
  348.         return -1;
  349.         
  350.     }
  351.     else
  352.     {

  353.         memset(DOMAIN_NAME,0x0,sizeof(DOMAIN_NAME));
  354.         memcpy(DOMAIN_NAME,url+offset,(p-url-offset));
  355.         p = strchr(DOMAIN_NAME,':');
  356.         if(p == NULL)
  357.         {
  358.             strcpy(ip,DOMAIN_NAME);
  359.             strcpy(port,"80");
  360.             //printf("ip %p,port %p\n",ip,port);
  361.             
  362.             #ifdef DEBUG_HTTP
  363.             printf("ip=%s,port=%s\n",ip,port);//debug info
  364.             #endif
  365.             return 1;

  366.         }
  367.         else
  368.         {    
  369.             *p = '\0';

  370.             strcpy(ip,DOMAIN_NAME);
  371.             strcpy(port,p+1);
  372.             
  373.             #ifdef DEBUG_HTTP
  374.             printf("ip=%s,port=%s\n",ip,port);//debug info
  375.             #endif
  376.             return 2;

  377.         }


  378.         return 0;
  379.     }
  380.     
  381. }
  382. void Package_Url_Get_File(char *path, char *range)
  383. {
  384.     char buf[64];
  385.     memset(g_buf_send,0x0,sizeof(g_buf_send));        
  386.     sprintf(g_buf_send, "GET %s",path);

  387.     
  388.     //HTTP/1.1\r\n 前面需要一个空格
  389.     strcat(g_buf_send," HTTP/1.1\r\n");
  390.     strcat(g_buf_send, "Host: ");
  391.     strcat(g_buf_send, g_host);
  392.     //strcat(g_buf_send, ":");
  393.     //strcat(g_buf_send, PORT);
  394.     
  395.     sprintf(buf, "\r\nRange: bytes=%s",range);
  396.     strcat(g_buf_send,buf);
  397.     strcat(g_buf_send, "\r\nKeep-Alive: 200");
  398.     strcat(g_buf_send,"\r\nConnection: Keep-Alive\r\n\r\n");
  399.     

  400. }

  401. int Package_Url_Get_FileSize(char *url)
  402. {
  403.     
  404.     memset(g_buf_send,0x0,sizeof(g_buf_send));        
  405.     sprintf(g_buf_send, "HEAD %s",url);

  406.         //HTTP/1.1\r\n 前面需要一个空格
  407.     strcat(g_buf_send," HTTP/1.1\r\n");
  408.     strcat(g_buf_send, "Host: ");
  409.     strcat(g_buf_send, g_host);
  410.     //strcat(g_buf_send, ":");
  411.     //strcat(g_buf_send, PORT);
  412.     strcat(g_buf_send,"\r\nConnection: Keep-Alive\r\n\r\n");

  413.     return 0;
  414. }


  415. int HTTP_GetFileSize(int sockfd,char *path)
  416. {
  417.     int ret = -1;
  418.     char buf_recv_tmp[10*1024+1];

  419.     Package_Url_Get_FileSize(path);
  420. #ifdef DEBUG_HTTP
  421.     printf("send = %s \n",g_buf_send);
  422. #endif

  423.     Send(sockfd, g_buf_send, strlen(g_buf_send), 0);

  424.     memset(buf_recv_tmp,0x0,sizeof(buf_recv_tmp));                                                
  425.     ret = Recv(sockfd,buf_recv_tmp,sizeof(buf_recv_tmp)-1,0);
  426. #ifdef DEBUG_HTTP
  427.     printf("recv len = %d\n", ret);
  428.     printf("recv = %s\n", buf_recv_tmp);
  429. #endif
  430.     if(ret <= 0)
  431.     {
  432.         perror("ERR:recv fail GetFileSize()");
  433.         return -1;

  434.     }
  435.     ret = HTTP_GetContentLength(buf_recv_tmp);
  436.     if(ret <= 0)
  437.         return -1;
  438.     else
  439.         return ret;


  440. }




  441. /*
  442. 功能:分段下载文件
  443. 参数:
  444. 返回值:
  445. >0----------已下载文件大小(不包含上次下载)
  446. -1----------失败
  447. */
  448. int HTTP_GetFile(int sockfd,char *path,int filelength,int download_size,char *filebuf)
  449. {
  450.     int count;
  451.     char range[32];
  452.     int i;
  453.     int j = 0;//成功下载次数
  454.     int ret = -1;
  455.     char *p = NULL;
  456.     int download_index;//下载开始索引

  457.     count = (filelength%MAX_RECV_SIZE)?(filelength/MAX_RECV_SIZE +1):(filelength/MAX_RECV_SIZE);

  458.     download_index = download_size/MAX_RECV_SIZE;

  459.     for(i=download_index;i<count;i++)
  460.     {
  461.         //if(i == 20)//测试断点
  462.             //break;


  463.         if((i == (count-1))&&(filelength%MAX_RECV_SIZE))
  464.             sprintf(range,"%d-%d",i*MAX_RECV_SIZE,filelength-1);
  465.         else
  466.             sprintf(range,"%d-%d",i*MAX_RECV_SIZE,(i+1)*MAX_RECV_SIZE-1);


  467.         Package_Url_Get_File(path,range);
  468.         #ifdef DEBUG_HTTP
  469.          printf("send = %s \n",g_buf_send);
  470.         #endif
  471.          Send(sockfd, g_buf_send, strlen(g_buf_send), 0);

  472.         /*需改为提取http 返回协议头和协议体总长,然后定长接收*/
  473.         memset(g_buf_recv,0x0,sizeof(g_buf_recv));                                             
  474.         ret = HTTP_Recv(sockfd,g_buf_recv);
  475.         if(ret < 0)
  476.             break;
  477.         if(ret == 0 )//服务端断开连接
  478.         {
  479.             sockfd = Socket_Connect(g_ip,g_port);
  480.              i--;
  481.             continue;
  482.         }
  483.         /*提取协议体数据,保存在filebuf中*/
  484.         p = strstr(g_buf_recv,"\r\n\r\n");
  485.         if(p == NULL)//jia ru duan dian baocun
  486.         {
  487.             printf("ERR:g_buf_recv not contain end flag\n");
  488.             break;
  489.         }
  490.          else
  491.          {
  492.              memcpy(filebuf+j*MAX_RECV_SIZE,p+4,MAX_RECV_SIZE);
  493.              j++;

  494.          }
  495.     }
  496.     if(i == count)
  497.         return (filelength-download_size);
  498.     else
  499.         return (i*MAX_RECV_SIZE-download_size);
  500. }

  501. /*
  502. 功能:HTTP下载文件
  503. 参数:
  504. 返回值:
  505. 0----------下载完成
  506. -1---------失败
  507. -2---------部分下载完成
  508. :保存文件到bin所在目录
  509. */
  510. int HTTP_DownloadFile(char *url,char *save_path)
  511. {
  512.     int ret;
  513.     int sockfd;
  514.     int filesize;
  515.     int download_size;
  516.     char filename[FILENAME_LEN+1];
  517.     char filename_bp[FILENAME_LEN+3+1];
  518.     char *filebuf;
  519.     char save_file_path[FILENAME_LEN+1];//保存下载文件的路径+文件名

  520.     char path[PATH_LEN+1];//url中的path

  521.     //提取ip和port或url(url 暂不实现,需要gethostbyname linux)
  522.     ret = HTTP_Get_IP_PORT(url,g_ip,g_port);
  523.     if(ret == -1)
  524.         return -1;
  525.     else
  526.     {
  527.         sprintf(g_host,"%s:%s",g_ip,g_port);
  528.     }
  529.     //提取下载文件名
  530.     ret = HTTP_GetFileName(url,filename);
  531.     if(ret == -1)
  532.         return -1;

  533.     ret = HTTP_GetPath(url,path);
  534.     if(ret == -1)
  535.         return -1;
  536.     //sleep(3);//debug info
  537.     //建立连接
  538.     sockfd = Socket_Connect(g_ip,g_port);

  539.     //获取下载文件总大小
  540.     filesize = HTTP_GetFileSize(sockfd,path);
  541.     if(filesize == -1)
  542.         return -1;
  543.     //#ifdef DEBUG_HTTP
  544.     printf("http need download size %d\n",filesize);
  545.     //#endif
  546.     //malloc分配存储文件空间
  547.     filebuf = (char *)malloc(filesize);
  548.     if(filebuf == NULL)
  549.     {
  550.         perror("malloc filebuf fail");
  551.         return -1;
  552.     }
  553.     else
  554.         memset(filebuf,0x0,filesize);

  555.     download_size = Get_Breakpoint(url,filename,NULL);
  556.     #ifdef DEBUG_HTTP
  557.     printf("breakpoint download_size=%d\n",download_size);//debug info
  558.     sleep(3);//debug info
  559.     #endif
  560.     //分段下载文件
  561.     ret = HTTP_GetFile(sockfd,path,filesize,download_size,filebuf);
  562.     Close(sockfd);
  563.     if(ret < 0)
  564.     {
  565.         free(filebuf);
  566.         return -1;
  567.     }
  568.     else
  569.     {

  570.         sprintf(save_file_path,"%s%s",save_path,filename);
  571.         
  572.         #ifdef DEBUG_HTTP
  573.         printf("save_path=%s\n",save_path);
  574.         printf("filename=%s\n",filename);
  575.         printf("save_file_path=%s\n",save_file_path);
  576.         printf("download_size = %d\n",ret);
  577.         #endif
  578.         Save_File(filebuf,ret,save_file_path);
  579.         free(filebuf);
  580.         if((ret+download_size) == filesize)//全部下载完成
  581.         {
  582.             sprintf(filename_bp,"%s.bp",filename);
  583.             remove(filename_bp);
  584.             
  585.      printf("download success\n");
  586.             return 0;
  587.         }
  588.         else//部分下载完成
  589.         {
  590.             printf("part download success\n");
  591.             //保存断点信息
  592.             Save_Breakpoint(url,save_file_path,ret+download_size,NULL);
  593.             return -2;
  594.         }
  595.     }

  596. }
socket.c 

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  1. //socket.c
  2. //作者:王振

  3. #include <stdio.h>
  4. #include <stdlib.h>
  5. #include <errno.h>
  6. #include <string.h>
  7. #include <sys/types.h>
  8. #include <netinet/in.h>
  9. #include <sys/socket.h>
  10. #include <sys/wait.h>

  11. #include "socket.h"

  12. int Connect(int fd, struct sockaddr *addr, socklen_t len)
  13. {
  14.     int result;
  15.     if ((result = connect(fd, addr, len)) == -1) {
  16.         perror("connect");
  17.         exit(EXIT_FAILURE);
  18.     }
  19.     return 0;
  20. }

  21. int Socket_Connect(char *ip,char *port)
  22. {
  23.     struct sockaddr_in addr;

  24.     int sockfd;
  25.     int len;

  26.     
  27.     addr.sin_family = AF_INET;
  28.     addr.sin_addr.s_addr = inet_addr(ip);//127.0.0.1为本机ip
  29.     addr.sin_port = htons(atoi(port));
  30.     len = sizeof(addr);
  31.         
  32.     sockfd = socket(AF_INET, SOCK_STREAM, 0);
  33.     Connect(sockfd, (struct sockaddr*)&addr, len);
  34.     return sockfd;

  35. }


  36. /*
  37. 功能:向socketfd发送数据,内部实现了循环发送len长度
  38. 参数:
  39. sockfd 是代表你与远程程序连接的套接字描述符。
  40. msg 是一个指针,指向你想发送的信息的地址。
  41. len 是你想发送信息的长度。
  42. flags 发送标记。一般都设为0
  43. 返回:
  44. 0-------- 成功
  45. 退出---失败
  46. 修改:
  47. 备注:
  48. 王振
  49. */
  50. int Send(int sockfd, char *sendbuf, int len, int flags)
  51. {
  52.     int sendlen = 0;
  53.     int ret = -1;

  54.     while(sendlen < len)
  55.     {
  56.         ret = send(sockfd, sendbuf+sendlen, len-sendlen, flags);
  57.         if(-1 == ret)
  58.         {
  59.             perror("send");
  60.             exit(EXIT_FAILURE);
  61.         }
  62.         else
  63.             sendlen += ret;

  64.     }

  65.     return 0;

  66. }

  67. int Close(int sockfd)
  68. {
  69.     return close(sockfd);
  70.     

  71. }
  72. int Recv(int sockfd, char *recvbuf, int len, int flags)
  73. {
  74.     int recv_len;

  75.     if ((recv_len = recv(sockfd, recvbuf, len, flags)) < 0)
  76.     {
  77.         perror("recv error");
  78.         exit(EXIT_FAILURE);
  79.     }

  80.     return recv_len;
  81. }

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