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接上面/* rtc.c */后面.
- #include <sys/stat.h>
- #include <sys/types.h>
- #include <errno.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <time.h>
- #include <unistd.h>
- /**
- * 'Alleged RC4' Source Code picked up from the news.
- * From: allen@gateway.grumman.com (John L. Allen)
- * Newsgroups: comp.lang.c
- * Subject: Shrink this C code for fame and fun
- * Date: 21 May 1996 10:49:37 -0400
- */
- static unsigned char stte[256], indx, jndx, kndx;
- /*
- * Reset arc4 stte.
- */
- void stte_0(void)
- {
- indx = jndx = kndx = 0;
- do {
- stte[indx] = indx;
- } while (++indx);
- }
- /*
- * Set key. Can be used more than once.
- */
- void key(void * str, int len)
- {
- unsigned char tmp, * ptr = (unsigned char *)str;
- while (len > 0) {
- do {
- tmp = stte[indx];
- kndx += tmp;
- kndx += ptr[(int)indx % len];
- stte[indx] = stte[kndx];
- stte[kndx] = tmp;
- } while (++indx);
- ptr += 256;
- len -= 256;
- }
- }
- /*
- * Crypt data.
- */
- void arc4(void * str, int len)
- {
- unsigned char tmp, * ptr = (unsigned char *)str;
- while (len > 0) {
- indx++;
- tmp = stte[indx];
- jndx += tmp;
- stte[indx] = stte[jndx];
- stte[jndx] = tmp;
- tmp += stte[indx];
- *ptr ^= stte[tmp];
- ptr++;
- len--;
- }
- }
- /*
- * Key with file invariants.
- */
- int key_with_file(char * file)
- {
- struct stat statf[1];
- struct stat control[1];
- if (stat(file, statf) < 0)
- return -1;
- /* Turn on stable fields */
- memset(control, 0, sizeof(control));
- control->st_ino = statf->st_ino;
- control->st_dev = statf->st_dev;
- control->st_rdev = statf->st_rdev;
- control->st_uid = statf->st_uid;
- control->st_gid = statf->st_gid;
- control->st_size = statf->st_size;
- control->st_mtime = statf->st_mtime;
- control->st_ctime = statf->st_ctime;
- key((char *)control, sizeof(control));
- return 0;
- }
- #if DEBUGEXEC
- void debugexec(char * shll, int argc, char ** argv)
- {
- int i;
- fprintf(stderr, "shll=%s\n", shll ? shll : "<null>");
- fprintf(stderr, "argc=%d\n", argc);
- if (!argv) {
- fprintf(stderr, "argv=<null>\n");
- } else {
- for (i = 0; i <= argc ; i++)
- fprintf(stderr, "argv[%d]=%.60s\n", i, argv[i] ? argv[i] : "<null>");
- }
- }
- #endif /* DEBUGEXEC */
- void rmarg(char ** argv, char * arg)
- {
- for (; argv && *argv && *argv != arg; argv++);
- for (; argv && *argv; argv++)
- *argv = argv[1];
- }
- int chkenv(int argc)
- {
- char buff[512];
- unsigned mask, m;
- int l, a, c;
- char * string;
- extern char ** environ;
- mask = (unsigned)chkenv;
- mask ^= (unsigned)getpid() * ~mask;
- sprintf(buff, "x%x", mask);
- string = getenv(buff);
- #if DEBUGEXEC
- fprintf(stderr, "getenv(%s)=%s\n", buff, string ? string : "<null>");
- #endif
- l = strlen(buff);
- if (!string) {
- /* 1st */
- sprintf(&buff[l], "=%u %d", mask, argc);
- putenv(strdup(buff));
- return 0;
- }
- c = sscanf(string, "%u %d%c", &m, &a, buff);
- if (c == 2 && m == mask) {
- /* 3rd */
- rmarg(environ, &string[-l - 1]);
- return 1 + (argc - a);
- }
- return -1;
- }
- #if !TRACEABLE
- #define _LINUX_SOURCE_COMPAT
- #include <sys/ptrace.h>
- #include <sys/types.h>
- #include <sys/wait.h>
- #include <fcntl.h>
- #include <signal.h>
- #include <stdio.h>
- #include <unistd.h>
- void untraceable(char * argv0)
- {
- char proc[80];
- int pid, mine;
- switch(pid = vfork()) {
- case 0:
- pid = getppid();
- /* For problematic SunOS ptrace */
- sprintf(proc, "/proc/%d/as", (int)pid);
- close(0);
- mine = !open(proc, O_RDWR|O_EXCL);
- if (!mine && errno != EBUSY)
- mine = !ptrace(0, pid, 0, 0, 0);
- if (mine) {
- kill(pid, SIGCONT);
- } else {
- perror(argv0);
- kill(pid, SIGKILL);
- }
- _exit(mine);
- case -1:
- break;
- default:
- if (pid == waitpid(pid, 0, 0))
- return;
- }
- perror(argv0);
- _exit(1);
- }
- #endif /* !TRACEABLE */
- char * xsh(int argc, char ** argv)
- {
- char * scrpt;
- int ret, i, j;
- char ** varg;
- stte_0();
- key(pswd, pswd_z);
- arc4(msg1, msg1_z);
- arc4(date, date_z);
- if (date[0] && date[0]<time(NULL))
- return msg1;
- arc4(shll, shll_z);
- arc4(inlo, inlo_z);
- arc4(xecc, xecc_z);
- arc4(lsto, lsto_z);
- arc4(tst1, tst1_z);
- key(tst1, tst1_z);
- arc4(chk1, chk1_z);
- if ((chk1_z != tst1_z) || memcmp(tst1, chk1, tst1_z))
- return tst1;
- ret = chkenv(argc);
- arc4(msg2, msg2_z);
- if (ret < 0)
- return msg2;
- varg = (char **)calloc(argc + 10, sizeof(char *));
- if (!varg)
- return 0;
- if (ret) {
- arc4(rlax, rlax_z);
- if (!rlax[0] && key_with_file(shll))
- return shll;
- arc4(opts, opts_z);
- arc4(text, text_z);
- arc4(tst2, tst2_z);
- key(tst2, tst2_z);
- arc4(chk2, chk2_z);
- if ((chk2_z != tst2_z) || memcmp(tst2, chk2, tst2_z))
- return tst2;
- if (text_z < hide_z) {
- /* Prepend spaces til a hide_z script size. */
- scrpt = malloc(hide_z);
- if (!scrpt)
- return 0;
- memset(scrpt, (int) ' ', hide_z);
- memcpy(&scrpt[hide_z - text_z], text, text_z);
- } else {
- scrpt = text; /* Script text */
- }
- } else { /* Reexecute */
- if (*xecc) {
- scrpt = malloc(512);
- if (!scrpt)
- return 0;
- sprintf(scrpt, xecc, argv[0]);
- } else {
- scrpt = argv[0];
- }
- }
- j = 0;
- varg[j++] = argv[0]; /* My own name at execution */
- if (ret && *opts)
- varg[j++] = opts; /* Options on 1st line of code */
- if (*inlo)
- varg[j++] = inlo; /* Option introducing inline code */
- varg[j++] = scrpt; /* The script itself */
- if (*lsto)
- varg[j++] = lsto; /* Option meaning last option */
- i = (ret > 1) ? ret : 0; /* Args numbering correction */
- while (i < argc)
- varg[j++] = argv[i++]; /* Main run-time arguments */
- varg[j] = 0; /* NULL terminated array */
- #if DEBUGEXEC
- debugexec(shll, j, varg);
- #endif
- execvp(shll, varg);
- return shll;
- }
- int main(int argc, char ** argv)
- {
- #if DEBUGEXEC
- debugexec("main", argc, argv);
- #endif
- #if !TRACEABLE
- untraceable(argv[0]);
- #endif
- argv[1] = xsh(argc, argv);
- fprintf(stderr, "%s%s%s: %s\n", argv[0],
- errno ? ": " : "",
- errno ? strerror(errno) : "",
- argv[1] ? argv[1] : "<null>"
- );
- return 1;
- }
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发表于 2006-01-19 11:33
