sendmail是linux的系统用户，你要修改的话 只有修改它的系统用户名和密码
方法如下,调用linux命令
////////添加用户
useradd -p 密码 用户名
///////修改密码
usermod -p 密码 用户名
///////删除用户
userdel 用户名
///////执行以上命令
String exec=" ";
如修改密码
还有密码要用Crypt来加密
String exec="useradd -p "+new Crypt().decode(密码,"salt")+" 用户名" ;
Stirng proErr;
Process pro= java.lang.Runtime.getRuntime().exec(exec);
proErr=Tools.proMsg(pro).trim();
根据返回的信息来判断用户是否添加是否成功
密码要用Crypt来加密
代码如下
public class Crypt
{
static int sub[] = new int[48];
// TABLES
/* Expansion table (32 to 48) */
int E_p[] = {
32, 1, 2, 3, 4, 5, 4, 5, 6, 7, 8, 9,
8, 9,10,11,12,13,12,13,14,15,16,17,
16,17,18,19,20,21,20,21,22,23,24,25,
24,25,26,27,28,29,28,29,30,31,32, 1
};
/* Permutation Choice 1 for subkey generation (64/56 to 56) */
int PC1_p[] = {
57,49,41,33,25,17, 9, 1,58,50,42,34,26,18,
10, 2,59,51,43,35,27,19,11, 3,60,52,44,36,
63,55,47,39,31,23,15, 7,62,54,46,38,30,22,
14, 6,61,53,45,37,29,21,13, 5,28,20,12, 4
};
/* Permutation Choice 2 for subkey generation (56 to 48) */
int PC2_p[] = {
14,17,11,24, 1, 5, 3,28,15, 6,21,10,
23,19,12, 4,26, 8,16, 7,27,20,13, 2,
41,52,31,37,47,55,30,40,51,45,33,48,
44,49,39,56,34,53,46,42,50,36,29,32
};
/* Number of rotations for the iteration of key scheduling */
/* The concept of a table heredo
esn't fit our behavioral model */
/* This will be logic in our final design */
int keyrots[] = {1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1};
/* Selection blocks
* There are 8 sblocks, each of which is referenced by a 2 bit value
* which picks the row, and a 4 bit value which picks the column
* This number is then
the 4 bit output for that select block
*/
int sblocks[][][] = {
{ { 14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7 },
{ 0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8 },
{ 4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0 },
{ 15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13 }
},
{ { 15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10 },
{ 3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5 },
{ 0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15 },
{ 13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9 }
},
{ { 10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8 },
{ 13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1 },
{ 13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7 },
{ 1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12 }
},
{ { 7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15 },
{ 13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9 },
{ 10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4 },
{ 3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14 }
},
{ { 2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9 },
{ 14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6 },
{ 4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14 },
{ 11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3 }
},
{ { 12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11 },
{ 10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8 },
{ 9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6 },
{ 4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13 }
},
{ { 4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1 },
{ 13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6 },
{ 1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2 },
{ 6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12 }
},
{ { 13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7 },
{ 1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2 },
{ 7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8 },
{ 2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11 }
}
};
/* Permutation P for after sblocks */
int P_p[] = {
16, 7,20,21,29,12,28,17, 1,15,23,26, 5,18,31,10,
2, 8,24,14,32,27, 3, 9,19,13,30, 6,22,11, 4,25
};
/* Inverse permutation of IP for end
* Temporary - the true behavior will be implemented in a shift out register
* (Look at the pattern obvious in an 8x8 layout)
*/
int IPinv_p[] = {
40, 8, 48, 16, 56, 24, 64, 32,
39, 7, 47, 15, 55, 23, 63, 31,
38, 6, 46, 14, 54, 22, 62, 30,
37, 5, 45, 13, 53, 21, 61, 29,
36, 4, 44, 12, 52, 20, 60, 28,
35, 3, 43, 11, 51, 19, 59, 27,
34, 2, 42, 10, 50, 18, 58, 26,
33, 1, 41, 9, 49, 17, 57, 25
};
// CODE
private void pr_bits (int[] s, int amt)
{
amt /= 8;
for (int i=0;
i<amt;
i++)
{
int x=0;
for (int j=0;
j<8;
j++)
x |= s[i*8+j] << (7-j);
Integer integ = new Integer(x);
System.out.print(integ.toString(x,16)+" ");
}
System.out.println();
};
private void permute (int[] by, int amt, int[] in, int[] out)
{
for (;
--amt>=0;
)
out[amt] = in[by[amt]-1];
};
private voiddo
_sblocks (int[] in, int[] out)
{
for (int i=0;
i<8;
i++)
{
int val = sblocks
[in[i*6] << 1 | in[i*6+5]]
[in[i*6+1] << 3 |
in[i*6+2] << 2 |
in[i*6+3] << 1 |
in[i*6+4] << 0 ];
out[i*4+0] = val >> 3 &
1;
out[i*4+1] = val >> 2 &
1;
out[i*4+2] = val >> 1 &
1;
out[i*4+3] = val >> 0 &
1;
}
};
private int ascii_to_bin (char c)
{
if (c>='a') return(c-59);
if (c>='A') return(c-53);
return(c-'.');
};
private char bin_to_ascii (int c)
{
if (c>=38) return (char)(c-38+'a');
if (c>=12) return (char)(c-12+'A');
return (char)(c+'.');
};
private void load_salt (int[] saltmask, char[] salt)
{
int tot = ascii_to_bin (salt[0]) | (ascii_to_bin (salt[1]) << 6);
for (int i=0;
i < 12;
i++)
saltmask = tot >> i &
1;
};
private voiddo
_salt (int[] bits, int[] saltmask)
{
for (int i=0;
i<12;
i++)
if (saltmask!=0)
{
int t = bits;
bits = bits[24+i];
bits[24+i] = t;
}
};
private void load_key (int[] ikey, char[] password)
{
int tmp[] = new int[64];
for (int i=0;
i<8;
i++)
for (int j=0;
j<8;
j++)
tmp[i*8+j] = (password >> (6-j)) &
1;
permute(PC1_p, 56, tmp, ikey);
};
private void subkey (int[] ikey, int iter)
{
int rots=keyrots[iter];
int tmp0l=ikey[0];
int tmp1l=ikey[1];
int tmp0r=ikey[28];
int tmp1r=ikey[29];
for (int i=0;
i<28-rots;
i++)
{
ikey = ikey[i+rots];
ikey[28+i] = ikey[28+i+rots];
}
if(rots==2)
{
ikey[26] = tmp0l;
ikey[27] = tmp1l;
ikey[54] = tmp0r;
ikey[55] = tmp1r;
}
else
{
ikey[27] = tmp0l;
ikey[55] = tmp0r;
}
permute (PC2_p,48,ikey,sub);
};
private void xor(int[] src1, int[] src2, int index, int num)
{
for (int i=0;
i<num;
i++)
src1 = (src1 ^ src2[index+i]) &
1;
};
private void print_bits(int[] s, int amt )
{
for (int i=0;
i<amt;
i++)
System.out.print (""+s);
System.out.println ("");
};
private voiddo
_f(int[] in,int index, int[] out, int iter, int[] ikey, int[] saltmask)
{
int tmp48[] = new int[48], tmp32[] = new int[32], skey[];
for (int i=0;
i<32;
i++)
tmp32 = in[i+index];
permute (E_p,48,tmp32, tmp48);
do
_salt (tmp48, saltmask);
subkey (ikey,iter);
skey = sub;
xor (tmp48,skey,0,48);
// Goed
do
_sblocks (tmp48, tmp32);
permute (P_p, 32, tmp32,out);
};
private char[] mycrypt (char[] password, char[] salt)
{
int bits[] = new int[64];
int outl[] = new int[32];
int outr[] = new int[32];
intdo
ne[] = new int[66];
// In c-code array-size was 64 !?!
int ikey[] = new int[56];
int saltmask[]=new int[12];
char[] answer= new char[14];
for (int i=0;
i<64;
i++)
bits=0;
load_key(ikey,password);
load_salt(saltmask,salt);
for (int dess=0;
dess<25;
dess++)
{
for (int iters=0;
iters<16;
iters+=2)
{
do
_f(bits,32,outl,iters,ikey,saltmask);
xor(outl,bits,0,32);
do
_f(outl,0,outr,iters+1,ikey,saltmask);
xor(outr,bits,32,32);
if (iters != 14)
for (int i=0;
i<32;
i++)
{
bits = outl;
bits[i+32] = outr;
}
else
for (int i=0;
i<32;
i++)
{
bits = outr;
bits[i+32] = outl;
}
}
}
permute(IPinv_p, 64, bits,do
ne);
answer[0] = (char)salt[0];
answer[1] = (char)salt[1];
for (int i=0;
i<11;
i++)
{
char c=0;
for (int j=0;
j<6;
j++)
c |=do
ne[6*i+j] << (5-j);
answer[i+2] = bin_to_ascii (c);
}
return answer;
};
/**
* This method decodes the given password
* Encryption is based on the one way DES encryption
* @return The encrypted password
* @param passwd is the password to encrypt
* @param s is salt
*/
public String decode (String passwd, String s)
{
char[] password = new char[9];
char[] salt = new char[3];
String uitkomst;
passwd.getChars (0,passwd.length()>=8 ? 8 : passwd.length(),password,0);
s.getChars (0,2,salt,0);
uitkomst = new String ().valueOf (mycrypt (password,salt));
return (uitkomst.substring (0,13));
}
}
//返回命令行执行后的信息
public static String proMsg(Process pro)
{
String line,Msg;
Msg="";
line ="";
java.io.InputStreamReader ir=new java.io.InputStreamReader(pro.getInputStream());
java.io.LineNumberReader input=new java.io.LineNumberReader(ir);
try{
while ((line = input.readLine()) !=null) {
Msg=Msg+line;
}
}
catch (Exception e){return "";}
return Msg;
}
]和具体实现方法