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[函数] 关于socket的两个疑问 [复制链接]

kukule75

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发表于 2008-06-25 19:54 |只看该作者 |倒序浏览

下面是我的片断代码，是向某服务器发送数据请求

#include <sys/socket.h>
#include <netdb.h>
#include <netinet/in.h>
#include "zlib.h"
#include "gzip.h"
#include "globe.h"
#define CRAWLER_ERR -1
#define CRAWLER_SUCCESS 1
static int channel_list_socket(void)
{
int fd; struct sockaddr_in channel_list_addr;
struct hostent * host=NULL; struct timeval tv_out;
tv_out.tv_sec = 10; tv_out.tv_usec = 0;
//char list_ser[40] = "list.pplive.com";
//char list_ser[40] = "res.pplive.com";
char list_ser[40] = "vodchannel.pplive.com";
if ((host = gethostbyname(list_ser)) == NULL)
{
fprintf(stderr, "gethostbyname() failed: %s\n", strerror(errno));
return CRAWLER_ERR;
}
if ((fd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
{
fprintf(stderr, "socket() failed: %s\n", strerror(errno));
return CRAWLER_ERR;
}
memset(&channel_list_addr, 0, sizeof(channel_list_addr));
channel_list_addr.sin_family = AF_INET;
channel_list_addr.sin_port = htons(80);
//channel_list_addr.sin_addr.s_addr = htonl(INADDR_ANY);
channel_list_addr.sin_addr = *((struct in_addr *)host->h_addr);
/*
if ((bind(fd, (struct sockaddr*)&srvaddr, sizeof(srvaddr))) < 0) {
fprintf(stderr, "bind() failed: %s\n", strerror(errno));
close(fd); return CRAWLER_ERR;
}
*/
if(connect(fd, (struct sockaddr *)(&channel_list_addr), sizeof(struct sockaddr)) == -1)
{
fprintf(stderr, "connect() failed: %s\n", strerror(errno));
close(fd); return CRAWLER_ERR;
}
if (setsockopt(fd, SOL_SOCKET, SO_SNDTIMEO, (const char *)&tv_out, sizeof(tv_out)) == -1)
{
fprintf(stderr, "setsockopt() for SO_SNDTIMEO failed: %s\n", strerror(errno));
close(fd); return CRAWLER_ERR;
}
if (setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, (const char *)&tv_out, sizeof(tv_out)) == -1)
{
fprintf(stderr, "setsockopt() for SO_RCVTIMEO failed: %s\n", strerror(errno));
close(fd); return CRAWLER_ERR;
}
return fd;
}
static int channel_list_extra(const char * list_buf)
{
char *gzip_start = NULL; char *gzip_len = NULL; int gziplen;
int decode_leng = 0; char channel_list[1024*1024] = {0};
gzip_start = strstr(list_buf, "\r\n\r\n") + strlen("\r\n\r\n");
gzip_len = strstr(list_buf, "Content-Length: ") + strlen("Content-Length: ");
gziplen = atoi(gzip_len);
gzip_decode((Byte*)channel_list, (uLong *)&decode_leng, (Byte*)gzip_start, (uLong)gziplen);
fprintf(stderr, "*******\n%s\n*******\n", channel_list);
return CRAWLER_SUCCESS;
}
int main(int argc, char * argv[])
{
char require[1024] = {0}; int skt; int len;
char list_buf_gzip[1024 * 512] = {0}; int how = 0; int total = 0;
//snprintf(require, sizeof(require), "%s", "GET /zh-cn/xml/secure2.xml HTTP/1.1\r\nAccept: */*\r\nAccept-Encoding: gzip, deflate\r\nUser-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727)\r\nHost: list.pplive.com\r\nConnection: Keep-Alive\r\nCache-Control: no-cache\r\n\r\n");
//snprintf(require, sizeof(require), "%s", "GET /passport/UI/Security/images/_css.css HTTP/1.1\r\nAccept: */*\r\nReferer: [url]http://passport.pplive.com/UI/Security/minilogin.aspx[/url]\r\nAccept-Language: zh-cn\r\nAccept-Encoding: gzip, deflate\r\nUser-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727)\r\nHost: res.pplive.com\r\nConnection: Keep-Alive\r\n\r\n");
snprintf(require, sizeof(require), "%s", "GET /listall2.xml HTTP/1.1\r\nAccept: */*\r\nAccept-Encoding: gzip, deflate\r\nUser-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727)\r\nHost: vodchannel.pplive.com\r\nConnection: Keep-Alive\r\nCache-Control: no-cache\r\n\r\n");
if ((skt = channel_list_socket()) == -1){ exit(EXIT_FAILURE); }
len = strlen(require);
if ((send(skt, require, len, 0)) != len)
{
fprintf(stderr, "send require error: %s\n", strerror(errno));
exit(EXIT_FAILURE);
}
do
{
if ((how = recv(skt, &list_buf_gzip[total], 1024*512, 0)) == -1)
{
fprintf(stderr, "recv channel list error: %s\n", strerror(errno));
exit(EXIT_FAILURE);
}
total += how;
}while(how > 0);
/* another way to know total gzip num
char *compr = NULL; int comlen;
compr = strstr(list_buf_gzip, "\r\n\r\n") + strlen("\r\n\r\n");
comlen = total + list_buf_gzip - compr;
fprintf(stderr, "compress len is %d\n", comlen);
*/
fprintf(stderr, "*******(%d---%d)\n%s\n*******\n", strlen(list_buf_gzip), total, list_buf_gzip);
close(skt);
shutdown(skt, 2);
channel_list_extra(list_buf_gzip);
return EXIT_SUCCESS;
}

复制代码

1.实际运行中发现程序阻塞在recv；如果设置超时，结果就超时退出；反正socket接受不到任何数据，但是我用抓包程序，发现服务器已经返回数据，这是为什么？
2.我用抓包程序，发现没有四次握手的连接断开，为什么？看书说close不一定会有四次握手，后来加了shutdown还是不行
3.请知道的说明一下，谢谢

[ 本帖最后由 kukule75 于 2008-6-25 21:17 编辑 ]