ref: e3aee39a389700ad821a1619f114e226c1bd42d0
dir: /sys/src/cmd/9nfs/9auth.c/
#include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <stdio.h> #define NETCHLEN 16 /* max network challenge length */ char * argv0; int debug; int delete; char * root = "/n/emelie"; char * user; char file[64]; char challenge[NETCHLEN]; char response[NETCHLEN]; void usage(void) { printf("usage: %s [-d] username\n", argv0); exit(1); } void main(int argc, char **argv) { int fd, n; for(argv0=*argv++,--argc; argc>0; ++argv,--argc){ if(argv[0][0] != '-' || argv[0][1] == '-') break; switch(argv[0][1]){ case 'D': ++debug; break; case 'd': ++delete; break; case 'r': root = argv[0][2] ? &argv[0][2] : (--argc, *++argv); break; default: usage(); break; } } if(argc != 1) usage(); user = argv[0]; snprintf(file, sizeof file, "%s/#%s", root, user); if(debug) printf("debug=%d, file=%s\n", debug, file); if(delete){ fd = creat(file, 0600); if(fd < 0){ perror(file); exit(1); } exit(0); } fd = open(file, 2); if(fd < 0){ perror(file); exit(1); } n = read(fd, challenge, NETCHLEN); if(debug) printf("read %d\n", n); if(n <= 0){ printf("read %d: ", n); perror(""); exit(1); } printf("challenge: %s\n", challenge); write(1, "response: ", 10); read(0, response, NETCHLEN-1); lseek(fd, 0, 0); n = write(fd, response, NETCHLEN); if(debug) printf("write %d\n", n); if(n <= 0){ printf("write %d: ", n); perror(""); exit(1); } exit(0); }