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我写了一个测试telnet的小程序
./tntest 127.0.0.1
程序会交互式地要求输入，并将反馈打印出来
先输入： ff fc 18 ff fc 1f ff fc 23 ff fc 27 ff fc 24
打印为
IAC WONT TERMINAL TYPE IAC WONT NAWS IAC WONT XDISPLOC IAC WONT NEW-ENVIRON IAC WONT OLD-ENVIRON
反馈：IAC DONT AUTHENTICATION IAC DO TERMINAL TYPE
再输入 ff fe 01 ff fe 03 ff fc 01 vvvlogin 0d 0a
注意vvvlogin要求程序一直读到"login"为止
反馈：
AIX Version 5
(C) Copyrights by IBM and by others 1982, 2000.
login:
prompt matched
selread, ret = 178
再输入用户 william
vvvPassword william 0d 0a
如此一起下去，直到 vvv$ exit 0d 0a退出
typedef struct {
int n;
char p[32];
} prompt_t;
static void telnet_print(unsigned char *buf, size_t n);
static const char sep[] = " \r\n";
static ssize_t selread(int fd, void *vptr, size_t n, int *pflag, prompt_t *pattern);
static char *bstrstr(char *bstr, prompt_t *prompt, size_t nmax);
char line[256], buf[16384];
int main(int argc, char *argv[])
{
char *p, *key, *next, *pe;
struct sockaddr_in sa;
prompt_t pattern;
int sock, bconnected = 0;
int n, value;
int lastflag;
unsigned char c;
if(argc == 1) {
return -1;
}
bzero(&sa, sizeof(sa));
sa.sin_family = AF_INET;
sa.sin_addr.s_addr = inet_addr(argv[1]);
if(2 == argc)
sa.sin_port = htons(23);
else
sa.sin_port = htons((short)atoi(argv[2]));
sock = socket(AF_INET, SOCK_STREAM, 0);
for(c=15; c<=19; c++)
printf("%.2x: %s\t", c+236, telcmds[c]);
printf("\ntelnet options");
for(c=0; c<=39; c++) {
if(c % 5 == 0) printf("\n");
printf("%.2x: %s\t", c, telopts[c]);
}
printf("\n");
pattern.n = 0;
while(1) {
printf("\nplease input: ");
fflush(stdout);
fgets(line, 256, stdin);
if(line[0] == 'q') break;
next = line;
while(' ' == *next)
next++;
p = buf;
pattern.n = 0;
while(1)
if('\'' == (c = *next) || (c == '\"')) {
pe = strchr(++next, c);
*pe = '\0';
n = pe - next;
telnet_print(buf, n);
if(bconnected == 0) {
if(connect(sock, (SA *)&sa, sizeof(sa)) < 0) {
printf("connect fail\n");
close(sock);
return -1;
}
bconnected = 1;
}
write(sock, buf, n);
n = selread(sock, buf, 16384, &lastflag, &pattern);
printf("selread, ret = %d\n", n);
if(lastflag == 1)
break;
}
if(bconnected)
close(sock);
return 0;
}
void telnet_print(unsigned char *buf, size_t n)
{
int i;
for(i=0; i<n; i++, buf++)
if(*buf == 0xff && *(buf+1) != 0xff) {
printf("IAC %s %s ",
telcmds[*(buf+1)-236], telopts[*(buf+2)]);
i += 2;
buf += 2;
} else
putchar(*buf);
printf("\n");
}
ssize_t selread(int fd, void *vptr, size_t n, int *pflag, prompt_t *pattern)
{
fd_set rfds;
struct timeval tv;
size_t count, nleft;
ssize_t nread;
char *ptr;
int c;
ptr = vptr;
nleft = n;
*pflag = 0;
count = 0;
while(nleft > 0) {
tv.tv_sec = 1;
tv.tv_usec = 0;
FD_ZERO(&rfds);
FD_SET(fd, &rfds);
if((c = select(fd+1, &rfds, NULL, NULL, &tv)) < 0) {
if(errno == EINTR)
continue;
syslog(LOG_INFO, "selread: %s\n", strerror(errno));
*pflag = -1;
break;
}
if(c == 0) {
*pflag = -2;
break;
}
if(FD_ISSET(fd, &rfds)) {
nread = read(fd, ptr, nleft);
if(nread < 0) {
if(errno == EINTR)
continue;
syslog(LOG_INFO, "selread: %s\n", strerror(errno));
*pflag = -3;
break;
}
if(nread == 0) {
*pflag = 1;
break;
}
telnet_print(ptr, nread);
nleft -= nread;
count += nread;
ptr += nread;
if(pattern->n == 0 || bstrstr((char *)vptr, pattern, count)) {
break;
}
}
}
return(n - nleft);
}
char *bstrstr(char *bstr, prompt_t *prompt, size_t nmax)
{
char *s, *p, *q;
int i;
for(s=bstr; s<=bstr+nmax-prompt->n; s++)
if(*s == *prompt->p) {
for(i=1, p=s+1, q=prompt->p+1; i<prompt->n; i++, p++, q++)
if(*p != *q)
break;
if(i == prompt->n) {
printf("prompt matched\n");
return s;
}
}
return NULL;
} |
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楼主: 风舞
发表于 2006-07-28 14:09
