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shttpd_cgi.c
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#include "shttpd.h"
#define CGISTR "/cgi-bin/"
#define ARGNUM 16
#define READIN 0
#define WRITEOUT 1
int GenerateDirFile(struct worker_ctl *wctl)
{
struct conn_request *req = &wctl->conn.con_req;
struct conn_response *res = &wctl->conn.con_res;
char *command = strstr(req->uri, CGISTR) + strlen(CGISTR);
char *arg[ARGNUM];
int num = 0;
char *rpath = wctl->conn.con_req.rpath;
stat *fs = &wctl->conn.con_res.fsate;
/*打开目录*/
DIR *dir = opendir(rpath);
if(dir == NULL)
{
/*错误*/
res->status = 500;
retval = -1;
goto EXITgenerateIndex;
}
/*建立临时文件保存目录列表*/
File *tmpfile;
char tmpbuff[2048];
int filesize = 0;
char *uri = wctl->conn.con_req.uri;
tmpfile = tmpfile();
/*标题部分*/
sprintf(tmpbuff,
"%s%s%s",
"<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 3.2 Final//EN\">\n<HTML><HEAD><TITLE>",
uri,
"</TITLE></HEAD>\n" );
fprintf(tmpfile, "%s", tmpbuff);
filesize += strlen(tmpbuff);
/*标识部分*/
sprintf(tmpbuff,
"%s %s %s",
"<BODY><H1>Index of:",
uri,
" </H1> <HR><P><I>Date: </I> <I>Size: </I></P><HR>");
fprintf(tmpfile, "%s", tmpbuff);
filesize += strlen(tmpbuff);
/* 读取目录中的文件列表 */
struct dirent *de;
#define PATHLENGTH 2048
char path[PATHLENGTH];
char tmpath[PATHLENGTH];
char linkname[PATHLENGTH];
struct stat fs;
strcpy(path, rpath);
if(rpath[strlen(rpath)]!='/')
{
rpath[strlen(rpath)]='/';
}
while ((de = readdir(dir)) != NULL)/*读取一个文件*/
{
menset(tmpath, 0, sizeof(tmpath));
menset(linkname, 0, sizeof(linkname));
if(strcmp(de->d_name, "."))/*不是当前目录*/
{
if(strcmp(de->d_name, ".."))/*不是父目录*/
{
strcpy(linkname,de->d_name);/*将目录名称作为链接名称*/
}
else/*是父目录*/
{
strcpy(linkname, "Parent Directory");/*将父目录作为链接名称*/
}
sprintf(tmpath, "%s%s",path, de->d_name);/*构建当前文件的全路径*/
stat(tmpath, &fs);/*获得文件信息*/
if(S_ISDIR(fs.st_mode))/*是一个目录*/
{
/*打印目录的连接为目录名称*/
sprintf(tmpbuff, "<A HREF=\"%s/\">%s/</A><BR>\n", de->d_name,tmpath);
}
else/*正常文件*/
{
char size_str[32];
off_t size_int;
size_int = fs.st_size;/*文件大小*/
if (size_int < 1024)/*不到1K*/
sprintf(size_str, "%d bytes", (int) size_int);
else if (size_int < 1024*1024)/*不到1M*/
sprintf(size_str, "%1.2f Kbytes", (float) size_int / 1024);
else/*其他*/
sprintf(size_str, "%1.2f Mbytes", (float) size_int / (1024*1024));
/*输出文件大小*/
sprintf(tmpbuff, "<A HREF=\"%s\">%s</A> (%s)<BR>\n", de->d_name, linkname, size_int);
}
/*将形成的字符串写入临时文件*/
fprintf(tmpfile, "%s", tmpbuff);
filesize += strlen(tmpbuff);
}
}
/*生成临时的文件信息，主要是文件大小*/
fs.st_ctime = time(NULL);
fs.st_mtime = time(NULL);
fs.st_size = filesize;
fseek(tmpfile, (long) 0, SEEK_SET);/*移动文件指针到头部*/
{
DBGPRINT("==>Method_DoGet\n");
struct conn_response *res = &wctl->conn.con_res;
struct conn_request *req = &wctl->conn.con_req;
char path[URI_MAX];
memset(path, 0, URI_MAX);
size_t n;
unsigned long r1, r2;
char *fmt = "%a, %d %b %Y %H:%M:%S GMT";
/*需要确定的参数*/
size_t status = 200; /*状态值,已确定*/
char *msg = "OK"; /*状态信息,已确定*/
char date[64] = ""; /*时间*/
char lm[64] = ""; /*请求文件最后修改信息*/
char etag[64] = ""; /*etag信息*/
big_int_t cl; /*内容长度*/
char range[64] = ""; /*范围*/
struct mine_type *mine = NULL;
/*当前时间*/
time_t t = time(NULL);
(void) strftime(date,
sizeof(date),
fmt,
localtime(&t));
/*最后修改时间*/
(void) strftime(lm,
sizeof(lm),
fmt,
localtime(&res->fsate.st_mtime));
/*ETAG*/
(void) snprintf(etag,
sizeof(etag),
"%lx.%lx",
(unsigned long) res->fsate.st_mtime,
(unsigned long) res->fsate.st_size);
/*发送的MIME类型*/
mine = Mine_Type(req->uri, strlen(req->uri), wctl);
/*内容长度*/
cl = (big_int_t) res->fsate.st_size;
/*范围range*/
memset(range, 0, sizeof(range));
n = -1;
if (req->ch.range.v_vec.len > 0 )/*取出请求范围*/
{
printf("request range:%d\n",req->ch.range.v_vec.len);
n = sscanf(req->ch.range.v_vec.ptr,"bytes=%lu-%lu",&r1, &r2);
}
printf("n:%d\n",n);
if(n > 0)
{
status = 206;
(void) sseek(res->fd, r1, SEEK_SET);
cl = n == 2 ? r2 - r1 + 1: cl - r1;
(void) snprintf(range,
sizeof(range),
"Content-Range: bytes %lu-%lu/%lu\r\n",
r1,
r1 + cl - 1,
(unsigned long) res->fsate.st_size);
msg = "Partial Content";
}
memset(res->res.ptr, 0, sizeof(wctl->conn.dres));
snprintf(
res->res.ptr,
sizeof(wctl->conn.dres),
"HTTP/1.1 %d %s\r\n"
"Date: %s\r\n"
"Last-Modified: %s\r\n"
"Etag: \"%s\"\r\n"
"Content-Type: %.*s\r\n"
"Content-Length: %lu\r\n"
//"Connection:close\r\n"
"Accept-Ranges: bytes\r\n"
"%s\r\n",
status,
msg,
date,
lm,
etag,
strlen(mine->mime_type),
mine->mime_type,
cl,
range);
res->cl = cl;
res->status = status;
}
EXITgenerateIndex:
return 0;
}
int cgiHandler(struct worker_ctl *wctl)
{
struct conn_request *req = &wctl->conn.con_req;
struct conn_response *res = &wctl->conn.con_res;
char *command = strstr(req->uri, CGISTR) + strlen(CGISTR);
char *arg[ARGNUM];
int num = 0;
char *rpath = wctl->conn.con_req.rpath;
stat *fs = &wctl->conn.con_res.fsate;
int retval = -1;
/*查找CGI的命令*/
char *pos = command;
for(;*pos != '?' && *pos !='\0';pos++)
;
*pos = '\0';
sprintf(rpath, "%s%s",conf_para.CGIRoot,command);
/*CGI的参数*/
pos++;
for(;*pos != '\0' && num < ARGNUM;)
{
arg[num] = pos;
for(;*pos != '+' && *pos!='\0';pos++)
;
if(*pos == '+')
{
*pos = '\0';
pos++;
num++;
}
}
arg[num] = NULL;
/*命令的属性*/
if(stat(rpath,fs)<0)
{
/*错误*/
res->status = 403;
retval = -1;
goto EXITcgiHandler;
}
else if((fs->st_mode & S_IFDIR) == S_IFDIR)
{
/*是一个目录,列出目录下的文件*/
GenerateDirFile(wctl);
retval = 0;
goto EXITcgiHandler;
}
else if((fs->st_mode & S_IXUSR) != S_IXUSR)
{
/*所指文件不能执行*/
res->status = 403;
retval = -1;
goto EXITcgiHandler;
}
/*创建进程间通信的管道*/
int pipe_in[2];
int pipe_out[2];
if(pipe[pipe_in] < 0)
{
res->status = 500;
retval = -1;
goto EXITcgiHandler;
}
if(pipe[pipe_out] < 0)
{
res->status = 500;
retval = -1;
goto EXITcgiHandler;
}
/*进程分叉*/
int pid = 0;
pid = fork();
if(pid < 0)/*错误*/
{
res->status = 500;
retval = -1;
goto EXITcgiHandler;
}
else if(pid > 0)/*父进程*/
{
close(pipe_out[WRITEOUT]);
close(pipe_in[READIN]);
{
memset(path, 0, URI_MAX);
size_t n;
unsigned long r1, r2;
char *fmt = "%a, %d %b %Y %H:%M:%S GMT";
/*需要确定的参数*/
size_t status = 200; /*状态值,已确定*/
char *msg = "OK"; /*状态信息,已确定*/
char date[64] = ""; /*时间*/
char lm[64] = ""; /*请求文件最后修改信息*/
char etag[64] = ""; /*etag信息*/
big_int_t cl; /*内容长度*/
char range[64] = ""; /*范围*/
struct mine_type *mine = NULL;
/*当前时间*/
time_t t = time(NULL);
(void) strftime(date,
sizeof(date),
fmt,
localtime(&t));
/*最后修改时间*/
(void) strftime(lm,
sizeof(lm),
fmt,
localtime(&res->fsate.st_mtime));
/*ETAG*/
(void) snprintf(etag,
sizeof(etag),
"%lx.%lx",
(unsigned long) res->fsate.st_mtime,
(unsigned long) res->fsate.st_size);
/*发送的MIME类型*/
mine = Mine_Type(req->uri, strlen(req->uri), wctl);
memset(res->res.ptr, 0, sizeof(wctl->conn.dres));
snprintf(
res->res.ptr,
sizeof(wctl->conn.dres),
"HTTP/1.1 %d %s\r\n"
"Date: %s\r\n"
"Last-Modified: %s\r\n"
"Etag: \"%s\"\r\n"
"Content-Type: %s\r\n"
"Accept-Ranges: bytes\r\n"
"%s\r\n",
status,
msg,
date,
lm,
etag,
"html",
range);
res->status = status;
send(wctl->conn.cs, res->res.ptr, strlen(res->res.ptr));
}
int size = 0;
int end = 0;
while(size > 0 && !end)
{
size = read(pipe_out[READIN], res->res.ptr, sizeof(wctl->conn.dres));
if(size > 0)
{
send(wctl->conn.cs, res->res.ptr, strlen(res->res.ptr));
}
else
{
end = 1;
}
}
wait(&end);
close(pipe_out[READIN]);
close(pipe_in[WRITEOUT]);
retval = 0;
}
else/*子进程*/
{
char cmdarg[2048];
char onearg[2048];
char *pos = NULL;
int i = 0;
/*形成执行命令*/
memset(onearg, 0, 2048];
for(i = 0;i<num;i++)
sprintf(cmdarg,"%s %s", onearg, arg[i]);
/*将写入的管道绑定到标注输出*/
close(pipe_out[READIN]); /* 关闭无用的读管道*/
dup2(pipe_out[WRITEOUT], 1); /* 将写管道绑定到标注输出 */
close(pipe_out[WRITEOUT]); /* 关闭写管道 */
close(pipe_in[WRITEOUT]);
dup2(pipe_in[READIN], 0);
close(pipe_in[READIN]);
/*执行命令,命令的输出需要为标准输出*/
execlp(rpath, arg);
}
EXITcgiHandler:
return retval;
}