webbench源码分析

webbench源码分析

/* * (C) Radim Kolar 1997-2004 * This is free software, see GNU Public License version 2 for * details. * * Simple forking WWW Server benchmark: * * Usage: *   webbench --help * * Return codes: *    0 - sucess *    1 - benchmark failed (server is not on-line) *    2 - bad param *    3 - internal error, fork failed *  */ #include "socket.c"#include <unistd.h>#include <sys/param.h>#include <rpc/types.h>#include <getopt.h>#include <strings.h>#include <time.h>#include <signal.h>/* values */volatile int timerexpired=0;int speed=0;int failed=0;int bytes=0;/* globals */int http10=1; /* 0 - http/0.9, 1 - http/1.0, 2 - http/1.1 *//* Allow: GET, HEAD, OPTIONS, TRACE */#define METHOD_GET 0#define METHOD_HEAD 1#define METHOD_OPTIONS 2#define METHOD_TRACE 3#define PROGRAM_VERSION "1.5"int method=METHOD_GET;int clients=1;int force=0;int force_reload=0;int proxyport=80;char *proxyhost=NULL;int benchtime=30;/* internal */int mypipe[2];char host[MAXHOSTNAMELEN];#define REQUEST_SIZE 2048char request[REQUEST_SIZE];static const struct option long_options[]={ {"force",no_argument,&force,1}, {"reload",no_argument,&force_reload,1}, {"time",required_argument,NULL,'t'}, {"help",no_argument,NULL,'?'}, {"http09",no_argument,NULL,'9'}, {"http10",no_argument,NULL,'1'}, {"http11",no_argument,NULL,'2'}, {"get",no_argument,&method,METHOD_GET}, {"head",no_argument,&method,METHOD_HEAD}, {"options",no_argument,&method,METHOD_OPTIONS}, {"trace",no_argument,&method,METHOD_TRACE}, {"version",no_argument,NULL,'V'}, {"proxy",required_argument,NULL,'p'}, {"clients",required_argument,NULL,'c'}, {NULL,0,NULL,0}};/* prototypes */static void benchcore(const char* host,const int port, const char *request);static int bench(void);static void build_request(const char *url);static void alarm_handler(int signal){   timerexpired=1;}static void usage(void){   fprintf(stderr,        "webbench [option]... URL\n"        "  -f|--force               Don't wait for reply from server.\n"        "  -r|--reload              Send reload request - Pragma: no-cache.\n"        "  -t|--time <sec>          Run benchmark for <sec> seconds. Default 30.\n"        "  -p|--proxy <server:port> Use proxy server for request.\n"        "  -c|--clients <n>         Run <n> HTTP clients at once. Default one.\n"        "  -9|--http09              Use HTTP/0.9 style requests.\n"        "  -1|--http10              Use HTTP/1.0 protocol.\n"        "  -2|--http11              Use HTTP/1.1 protocol.\n"        "  --get                    Use GET request method.\n"        "  --head                   Use HEAD request method.\n"        "  --options                Use OPTIONS request method.\n"        "  --trace                  Use TRACE request method.\n"        "  -?|-h|--help             This information.\n"        "  -V|--version             Display program version.\n"        );};int main(int argc, char *argv[]){ int opt=0; int options_index=0; char *tmp=NULL; if(argc==1) {          usage();          return 2; } //解析输入参数 while((opt=getopt_long(argc,argv,"912Vfrt:p:c:?h",long_options,&options_index))!=EOF ) {  switch(opt)  {   case  0 : break;   case 'f': force=1;break;   case 'r': force_reload=1;break;    case '9': http10=0;break;   case '1': http10=1;break;   case '2': http10=2;break;   case 'V': printf(PROGRAM_VERSION"\n");exit(0);   case 't': benchtime=atoi(optarg);break;              case 'p':              /* proxy server parsing server:port */             tmp=strrchr(optarg,':');             proxyhost=optarg;             if(tmp==NULL)             {                     break;             }             if(tmp==optarg)             {                     fprintf(stderr,"Error in option --proxy %s: Missing hostname.\n",optarg);                     return 2;             }             if(tmp==optarg+strlen(optarg)-1)             {                     fprintf(stderr,"Error in option --proxy %s Port number is missing.\n",optarg);                     return 2;             }             *tmp='\0';             proxyport=atoi(tmp+1);break;   case ':':   case 'h':   case '?': usage();return 2;break;   case 'c': clients=atoi(optarg);break;  } } //检查是否提供带请求的url if(optind==argc) {                      fprintf(stderr,"webbench: Missing URL!\n");                      usage();                      return 2;                    } if(clients==0) clients=1; if(benchtime==0) benchtime=60; /* Copyright */ fprintf(stderr,"Webbench - Simple Web Benchmark "PROGRAM_VERSION"\n"         "Copyright (c) Radim Kolar 1997-2004, GPL Open Source Software.\n"         );//构建请求对象，严格遵守HTTP协议 build_request(argv[optind]); /* print bench info */ printf("\nBenchmarking: "); //选择请求方法，默认是GET switch(method) {         case METHOD_GET:         default:                 printf("GET");break;         case METHOD_OPTIONS:                 printf("OPTIONS");break;         case METHOD_HEAD:                 printf("HEAD");break;         case METHOD_TRACE:                 printf("TRACE");break; } printf(" %s",argv[optind]); switch(http10) {         case 0: printf(" (using HTTP/0.9)");break;         case 2: printf(" (using HTTP/1.1)");break; } printf("\n"); if(clients==1) printf("1 client"); else   printf("%d clients",clients); printf(", running %d sec", benchtime); if(force) printf(", early socket close"); if(proxyhost!=NULL) printf(", via proxy server %s:%d",proxyhost,proxyport); if(force_reload) printf(", forcing reload"); printf(".\n"); //开始测试 return bench();}void build_request(const char *url){  char tmp[10];  int i;//初始化host、request变量（清零）。  bzero(host,MAXHOSTNAMELEN);  bzero(request,REQUEST_SIZE);  if(force_reload && proxyhost!=NULL && http10<1) http10=1;  if(method==METHOD_HEAD && http10<1) http10=1;  if(method==METHOD_OPTIONS && http10<2) http10=2;  if(method==METHOD_TRACE && http10<2) http10=2;//构建请求行 如：GET  switch(method)  {          default:          case METHOD_GET: strcpy(request,"GET");break;          case METHOD_HEAD: strcpy(request,"HEAD");break;          case METHOD_OPTIONS: strcpy(request,"OPTIONS");break;          case METHOD_TRACE: strcpy(request,"TRACE");break;  } //请求行中添加空格 如：GET {空格}                   strcat(request," ");  if(NULL==strstr(url,"://"))  {          fprintf(stderr, "\n%s: is not a valid URL.\n",url);          exit(2);  }  if(strlen(url)>1500)  {         fprintf(stderr,"URL is too long.\n");         exit(2);  }  //无代理模式  if(proxyhost==NULL)           if (0!=strncasecmp("http://",url,7))            { fprintf(stderr,"\nOnly HTTP protocol is directly supported, set --proxy for others.\n");             exit(2);           }  /* protocol/host delimiter */  i=strstr(url,"://")-url+3;  /* printf("%d\n",i); *///url中除://外必须包含'/'  if(strchr(url+i,'/')==NULL) {                                fprintf(stderr,"\nInvalid URL syntax - hostname don't ends with '/'.\n");                                exit(2);                              }  if(proxyhost==NULL)  {   /* get port from hostname */   //获取待请求的hostname和port   if(index(url+i,':')!=NULL &&      index(url+i,':')<index(url+i,'/'))   {           strncpy(host,url+i,strchr(url+i,':')-url-i);           bzero(tmp,10);           strncpy(tmp,index(url+i,':')+1,strchr(url+i,'/')-index(url+i,':')-1);           /* printf("tmp=%s\n",tmp); */           proxyport=atoi(tmp);           if(proxyport==0) proxyport=80;   } else   {     strncpy(host,url+i,strcspn(url+i,"/"));   }   // printf("Host=%s\n",host);   //构建请求行，填充uri 如：GET /xx/yy/zz   strcat(request+strlen(request),url+i+strcspn(url+i,"/"));  } else  {   // printf("ProxyHost=%s\nProxyPort=%d\n",proxyhost,proxyport);   strcat(request,url);  }  //构建请求行，填充请求的协议：如：GET /xx/yy/zz HTTP/1.0   if(http10==1)          strcat(request," HTTP/1.0");  else if (http10==2)          strcat(request," HTTP/1.1");  //换行  /*  *GET /xx/yy/zz HTTP/1.0  *  */  strcat(request,"\r\n");  //构建请求头：如：  /*  *GET /xx/yy/zz HTTP/1.0  *User-Agent: WebBench "PROGRAM_VERSION"  *Host: {hostname}  *Connection: close  *  */  if(http10>0)          strcat(request,"User-Agent: WebBench "PROGRAM_VERSION"\r\n");  if(proxyhost==NULL && http10>0)  {          strcat(request,"Host: ");          strcat(request,host);          strcat(request,"\r\n");  }  if(force_reload && proxyhost!=NULL)  {          strcat(request,"Pragma: no-cache\r\n");  }  if(http10>1)          strcat(request,"Connection: close\r\n");  /* add empty line at end */  if(http10>0) strcat(request,"\r\n");   // printf("Req=%s\n",request);}/* vraci system rc error kod */static int bench(void){  int i,j,k;  pid_t pid=0;  FILE *f;  /* check avaibility of target server */  //检查服务端  i=Socket(proxyhost==NULL?host:proxyhost,proxyport);  if(i<0) {            fprintf(stderr,"\nConnect to server failed. Aborting benchmark.\n");           return 1;         }  close(i);  /* create pipe */  //创建管道  if(pipe(mypipe))  {          perror("pipe failed.");          return 3;  }  /* not needed, since we have alarm() in childrens */  /* wait 4 next system clock tick */  /*  cas=time(NULL);  while(time(NULL)==cas)        sched_yield();  */  /* fork childs */  //fork出进程  for(i=0;i<clients;i++)  {           pid=fork();           if(pid <= (pid_t) 0)           {           //子进程或者是出错                   /* child process or error*/                   sleep(1); /* make childs faster */                   break;           }  }//fork子进程出错  if( pid< (pid_t) 0)  {          fprintf(stderr,"problems forking worker no. %d\n",i);          perror("fork failed.");          return 3;  }//pid=0 当前在子进程中  if(pid== (pid_t) 0)  {    /* I am a child */    if(proxyhost==NULL)      benchcore(host,proxyport,request);         else      benchcore(proxyhost,proxyport,request);         /* write results to pipe */         f=fdopen(mypipe[1],"w");         if(f==NULL)         {                 perror("open pipe for writing failed.");                 return 3;         }         /* fprintf(stderr,"Child - %d %d\n",speed,failed); */         fprintf(f,"%d %d %d\n",speed,failed,bytes);         fclose(f);         return 0;  } else  {  //当前在父进程中          f=fdopen(mypipe[0],"r");          if(f==NULL)           {                  perror("open pipe for reading failed.");                  return 3;          }          setvbuf(f,NULL,_IONBF,0);          speed=0;          failed=0;          bytes=0;//等待其所有子进程结束          while(1)          {                  pid=fscanf(f,"%d %d %d",&i,&j,&k);                  if(pid<2)                  {                       fprintf(stderr,"Some of our childrens died.\n");                       break;                  }                  speed+=i;                  failed+=j;                  bytes+=k;                  /* fprintf(stderr,"*Knock* %d %d read=%d\n",speed,failed,pid); */                  if(--clients==0) break;          }          fclose(f);  printf("\nSpeed=%d pages/min, %d bytes/sec.\nRequests: %d susceed, %d failed.\n",                  (int)((speed+failed)/(benchtime/60.0f)),                  (int)(bytes/(float)benchtime),                  speed,                  failed);  }  return i;}void benchcore(const char *host,const int port,const char *req){ int rlen; char buf[1500]; int s,i; struct sigaction sa; /* setup alarm signal handler */ //设置alarm信号的处理方法 sa.sa_handler=alarm_handler; sa.sa_flags=0; if(sigaction(SIGALRM,&sa,NULL))    exit(3);    //定时器 alarm(benchtime); rlen=strlen(req); nexttry:while(1) {    if(timerexpired)    {       if(failed>0)       {          /* fprintf(stderr,"Correcting failed by signal\n"); */          failed--;       }       return;    }    //建立与服务端的socket的连接    s=Socket(host,port);                              if(s<0) { failed++;continue;}     if(rlen!=write(s,req,rlen)) {failed++;close(s);continue;}    if(http10==0)             if(shutdown(s,1)) { failed++;close(s);continue;}    if(force==0)     {            /* read all available data from socket */            //读取服务端的响应信息            while(1)            {              if(timerexpired) break;               i=read(s,buf,1500);              /* fprintf(stderr,"%d\n",i); */              if(i<0)               {                  failed++;                 close(s);                 goto nexttry;              }               else                       if(i==0) break;                       else                               bytes+=i;            }    }    if(close(s)) {failed++;continue;}    speed++; }}/* $Id: socket.c 1.1 1995/01/01 07:11:14 cthuang Exp $ * * This module has been modified by Radim Kolar for OS/2 emx *//***********************************************************************  module:       socket.c  program:      popclient  SCCS ID:      @(#)socket.c    1.5  4/1/94  programmer:   Virginia Tech Computing Center  compiler:     DEC RISC C compiler (Ultrix 4.1)  environment:  DEC Ultrix 4.3   description:  UNIX sockets code. ***********************************************************************/#include <sys/types.h>#include <sys/socket.h>#include <fcntl.h>#include <netinet/in.h>#include <arpa/inet.h>#include <netdb.h>#include <sys/time.h>#include <string.h>#include <unistd.h>#include <stdio.h>#include <stdlib.h>#include <stdarg.h>int Socket(const char *host, int clientPort){    int sock;    unsigned long inaddr;    struct sockaddr_in ad;    struct hostent *hp;    //初始化ad变量    memset(&ad, 0, sizeof(ad));    ad.sin_family = AF_INET;    inaddr = inet_addr(host);    if (inaddr != INADDR_NONE)        memcpy(&ad.sin_addr, &inaddr, sizeof(inaddr));    else    {        hp = gethostbyname(host);        if (hp == NULL)            return -1;        memcpy(&ad.sin_addr, hp->h_addr, hp->h_length);    }    ad.sin_port = htons(clientPort);    //创建客户端socket    sock = socket(AF_INET, SOCK_STREAM, 0);    if (sock < 0)        return sock;    //连接服务端    if (connect(sock, (struct sockaddr *)&ad, sizeof(ad)) < 0)        return -1;    //返回已建立连接的socket    return sock;}