实现shell终端代码分享(可用户登录 实现系统命令)
实现shell终端代码分享(可用户登录 实现系统命令)
发布时间:2016-12-28 来源:查字典编辑
摘要:复制代码代码如下:#include"apue.h"intuserlogin(structpasswd**);intmain(){intret...

复制代码 代码如下:

#include"apue.h"

int userlogin(struct passwd **);

int main()

{

int ret,i=0;

long ret_cwd;

struct passwd *pw;

char buf[128],hostname[16],usercwd[128];

char *ptmp1;

do{

ret = userlogin(&pw);

}while(ret != 1);

getchar();

while(1){

//to gethostname

if(gethostname(buf,128)!=0){

perror("gethostname()");

return 0;

}

//truncate hostname untill '.'

while(buf[i]!='.'){

hostname[i++] = buf[i];

}

i = 0;

//if the user is 'root' the symbol is '#'

//else '$'

//and the current work path is truncated from the last '/' to the end

ret_cwd = (long)getcwd(usercwd,128);

if(strcmp(usercwd,pw->pw_dir)==0){

ret = sprintf(usercwd,"~",NULL);

}

else if(strcmp(usercwd,"/")!=0){

ptmp1 = strrchr(usercwd,'/');

sprintf(usercwd,"%s",ptmp1+1);

}

if(strcmp(pw->pw_name,"root")==0){

sprintf(buf,"*[%s@%s %s]# ",

pw->pw_name,hostname,usercwd);

}

else{

sprintf(buf,"*[%s@%s %s]$ ",

pw->pw_name,hostname,usercwd);

}

//command

ssize_t g_ret,len;

char *line = NULL,*s_ret,*ptr=NULL;

int con_cd=0;

fprintf(stderr,"%s",buf);

g_ret = getline(&line,&len,stdin);

line[strlen(line)-1] = '';

if(strcmp(line,"exit")==0){

exit(-1);

}

ptr = line;

s_ret = line;

system(line);

while(ptr!=NULL){

s_ret = (char *)strsep(&ptr," ");

if(strcmp(s_ret,"cd") == 0){

con_cd=1;

continue;

}

else if(con_cd == 1){

chdir(s_ret);

}

}

}

return 0;

}

//login function

int userlogin(struct passwd **pw)

{

char name[32],*passwd,*pret;

struct spwd *sp;

printf("login:");

fflush(stdout);

scanf("%s",name);

passwd = getpass("password:");

sp = getspnam(name);

if(sp == NULL){

fprintf(stdout,"no is user![%s]n",name);

return 0;

}

pret = crypt(passwd,sp->sp_pwdp);

if(pret == NULL){

fprintf(stdout,"crypt(%s)n",name);

return 0;

}

if(strcmp(pret,sp->sp_pwdp) == 0){

printf("login successful!n");

}

else{

fprintf(stdout,"passwd is error!n");

return 0;

}

*pw = getpwnam(name);

if(*pw == NULL){

printf("getpwnam(%s) errorn",name);

return 0;

}

return 1;

}

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