main->build_request->bench->benchcore
/* * (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 */ //控制测试的时长：经过benchtime时间，通过发送SIGALARM信号调用函数alarm_handler，将timerexpired置为1，停止测试 volatile int timerexpired=0; //测试的结果 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 2048 char request[REQUEST_SIZE]; /* struct option{ //不带短横线的参数名 const char *name; //选项是否需要参数: no_argument(0)/required_argument(1)/optional_argument(2) int has_arg; //如果flag为NULL，getopt_long返回结构体中val的值；如果flag不为NULL，getopt_long返回0，flag所指对象的值为val的值，如果没有发现长选项，则flag所指的值不变 int *flag; //发现长选项后的返回值，一般为短选项字符常量，或者是flag不为NULL时，载入flag的值 int val; } */ 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 " " -f|--force Don't wait for reply from server. " " -r|--reload Send reload request - Pragma: no-cache. " " -t|--time <sec> Run benchmark for <sec> seconds. Default 30. " " -p|--proxy <server:port> Use proxy server for request. " " -c|--clients <n> Run <n> HTTP clients at once. Default one. " " -9|--http09 Use HTTP/0.9 style requests. " " -1|--http10 Use HTTP/1.0 protocol. " " -2|--http11 Use HTTP/1.1 protocol. " " --get Use GET request method. " " --head Use HEAD request method. " " --options Use OPTIONS request method. " " --trace Use TRACE request method. " " -?|-h|--help This information. " " -V|--version Display program version. " ); }; int main(int argc, char *argv[]) { int opt=0; int options_index=0; char *tmp=NULL; if(argc==1) { usage(); return 2; } /** 函数名：getlong_opt 参数：int argc char * const argv[] const char* optstring:所有定义的短选项字符,如果短选项字符后加‘：’表示必须跟参数 const struct option* longopts:长选项结构体 int* longindex:当前找到的参数在longopts中的下标值 返回值：如果为短选项，返回短选项的选项名 如果为长选项，返回长选项结构体定义的返回值 如果分析选项时遇到没有定义的选项，则返回？ 如果已经分析完所有选项，返回-1 备注：两个全局变量（optarg/opyint) optarg:当前处理选项的参数值 optint:下一个被处理的参数在argv中的下标值，当处理完所有选项，optint指向第一个非选项参数 **/ 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" ");exit(0); case 't': benchtime=atoi(optarg);break; case 'p': /* proxy server parsing server:port */ tmp=strrchr(optarg,':');//strrchr:查找字符在字符串中从左边开始，最后一次出现的位置，返回该字符及其后面的字符串 proxyhost=optarg; if(tmp==NULL) { break; } if(tmp==optarg) { fprintf(stderr,"Error in option --proxy %s: Missing hostname. ",optarg); return 2; } if(tmp==optarg+strlen(optarg)-1) { fprintf(stderr,"Error in option --proxy %s Port number is missing. ",optarg); return 2; } *tmp=' '; proxyport=atoi(tmp+1);break; case ':': case 'h': case '?': usage();return 2;break; case 'c': clients=atoi(optarg);break; } } if(optind==argc) { fprintf(stderr,"webbench: Missing URL! "); usage(); return 2; } if(clients==0) clients=1; if(benchtime==0) benchtime=60;//默认运行时间60 /* Copyright */ fprintf(stderr,"Webbench - Simple Web Benchmark "PROGRAM_VERSION" " "Copyright (c) Radim Kolar 1997-2004, GPL Open Source Software. " ); build_request(argv[optind]);//构造请求消息体 /* print bench info */ printf(" Benchmarking: "); 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(" "); 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(". "); return bench(); } /*构造请求消息体*/ /***消息示例 **** GET http://www.tencent.com:8080/ http/1.0 User-Agent: WebBench PROGRAM_VERSION Host: www.tencent.com Pragma: no-cache Connection: close **** */ void build_request(const char *url) { char tmp[10]; int i; 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; 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; } strcat(request," "); if(NULL==strstr(url,"://")) { fprintf(stderr, " %s: is not a valid URL. ",url); exit(2); } if(strlen(url)>1500) { fprintf(stderr,"URL is too long. "); exit(2); } if(proxyhost==NULL) if (0!=strncasecmp("http://",url,7)) { fprintf(stderr," Only HTTP protocol is directly supported, set --proxy for others. "); exit(2); } /* protocol/host delimiter */ i=strstr(url,"://")-url+3; /* printf("%d ",i); */ if(strchr(url+i,'/')==NULL) { fprintf(stderr," Invalid URL syntax - hostname don't ends with '/'. "); exit(2); } if(proxyhost==NULL) { /* get port from hostname */ 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 ",tmp); */ proxyport=atoi(tmp); if(proxyport==0) proxyport=80; } else { strncpy(host,url+i,strcspn(url+i,"/")); } // printf("Host=%s ",host); strcat(request+strlen(request),url+i+strcspn(url+i,"/")); } else { // printf("ProxyHost=%s ProxyPort=%d ",proxyhost,proxyport); strcat(request,url); } if(http10==1) strcat(request," HTTP/1.0"); else if (http10==2) strcat(request," HTTP/1.1"); strcat(request," "); if(http10>0) strcat(request,"User-Agent: WebBench "PROGRAM_VERSION" "); if(proxyhost==NULL && http10>0) { strcat(request,"Host: "); strcat(request,host); strcat(request," "); } if(force_reload && proxyhost!=NULL) { strcat(request,"Pragma: no-cache "); } if(http10>1) strcat(request,"Connection: close "); /* add empty line at end */ if(http10>0) strcat(request," "); // printf("Req=%s ",request); } /* vraci system rc error kod */ /* 父进程创建clients个子进程，父子进程通过pipe通信 */ static int bench(void) { int i,j,k; pid_t pid=0; FILE *f; /* check avaibility of target server */ i=Socket(proxyhost==NULL?host:proxyhost,proxyport); if(i<0) { fprintf(stderr," Connect to server failed. Aborting benchmark. "); return 1; } close(i); /* create pipe */ 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 */ for(i=0;i<clients;i++) { pid=fork(); if(pid <= (pid_t) 0) { /* child process or error*/ sleep(1); /* make childs faster */ break; } } if( pid< (pid_t) 0) { fprintf(stderr,"problems forking worker no. %d ",i); perror("fork failed."); return 3; } 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 ",speed,failed); */ fprintf(f,"%d %d %d ",speed,failed,bytes); fclose(f); return 0; } else { 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; while(1) { pid=fscanf(f,"%d %d %d",&i,&j,&k); if(pid<2) { fprintf(stderr,"Some of our childrens died. "); break; } speed+=i; failed+=j; bytes+=k; /* fprintf(stderr,"*Knock* %d %d read=%d ",speed,failed,pid); */ if(--clients==0) break; } fclose(f); printf(" Speed=%d pages/min, %d bytes/sec. Requests: %d susceed, %d failed. ", (int)((speed+failed)/(benchtime/60.0f)), (int)(bytes/(float)benchtime), speed, failed); } return i; } /* 子进程通过socket向被测服务器发送请求，该过程会改变speed、failed、bytes的值 */ 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 */ sa.sa_handler=alarm_handler; sa.sa_flags=0; if(sigaction(SIGALRM,&sa,NULL)) exit(3); alarm(benchtime); rlen=strlen(req); nexttry:while(1) { if(timerexpired) { if(failed>0) { /* fprintf(stderr,"Correcting failed by signal "); */ failed--; } return; } 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 */ while(1) { if(timerexpired) break; i=read(s,buf,1500); /* fprintf(stderr,"%d ",i); */ if(i<0) { failed++; close(s); goto nexttry; } else if(i==0) break; else bytes+=i; } } if(close(s)) {failed++;continue;} speed++; } }