Commit | Line | Data |
---|---|---|
4c6b79b5 | 1 | #ifndef lint |
6b52f313 | 2 | static char sccsid[] = "@(#)vipw.c 4.3 (Berkeley) %G%"; |
4c6b79b5 SL |
3 | #endif |
4 | ||
5 | #include <sys/types.h> | |
6 | #include <sys/stat.h> | |
7 | #include <sys/file.h> | |
8 | ||
9 | #include <stdio.h> | |
10 | #include <errno.h> | |
11 | #include <signal.h> | |
12 | ||
13 | /* | |
14 | * Password file editor with locking. | |
15 | */ | |
16 | char *temp = "/etc/ptmp"; | |
17 | char *passwd = "/etc/passwd"; | |
18 | char buf[BUFSIZ]; | |
19 | char *getenv(); | |
20 | char *index(); | |
21 | extern int errno; | |
22 | ||
23 | main(argc, argv) | |
24 | char *argv[]; | |
25 | { | |
26 | int fd; | |
27 | FILE *ft, *fp; | |
28 | char *editor; | |
29 | ||
30 | signal(SIGINT, SIG_IGN); | |
31 | signal(SIGQUIT, SIG_IGN); | |
32 | signal(SIGHUP, SIG_IGN); | |
33 | setbuf(stderr, NULL); | |
b2018160 | 34 | umask(0); |
4c6b79b5 SL |
35 | fd = open(temp, O_WRONLY|O_CREAT|O_EXCL, 0644); |
36 | if (fd < 0) { | |
37 | if (errno == EEXIST) { | |
38 | fprintf(stderr, "vipw: password file busy\n"); | |
39 | exit(1); | |
40 | } | |
41 | fprintf(stderr, "vipw: "); perror(temp); | |
42 | exit(1); | |
43 | } | |
44 | ft = fdopen(fd, "w"); | |
45 | if (ft == NULL) { | |
46 | fprintf(stderr, "vipw: "); perror(temp); | |
47 | goto bad; | |
48 | } | |
49 | fp = fopen(passwd, "r"); | |
50 | if (fp == NULL) { | |
51 | fprintf(stderr, "vipw: "); perror(passwd); | |
52 | goto bad; | |
53 | } | |
54 | while (fgets(buf, sizeof (buf) - 1, fp) != NULL) | |
55 | fputs(buf, ft); | |
56 | fclose(ft); fclose(fp); | |
57 | editor = getenv("EDITOR"); | |
58 | if (editor == 0) | |
59 | editor = "vi"; | |
60 | sprintf(buf, "%s %s", editor, temp); | |
61 | if (system(buf) == 0) { | |
62 | struct stat sbuf; | |
63 | int ok; | |
64 | ||
65 | /* sanity checks */ | |
66 | if (stat(temp, &sbuf) < 0) { | |
67 | fprintf(stderr, | |
68 | "vipw: can't stat temp file, %s unchanged\n", | |
69 | passwd); | |
70 | goto bad; | |
71 | } | |
72 | if (sbuf.st_size == 0) { | |
73 | fprintf(stderr, "vipw: bad temp file, %s unchanged\n", | |
74 | passwd); | |
75 | goto bad; | |
76 | } | |
77 | ft = fopen(temp, "r"); | |
78 | if (ft == NULL) { | |
79 | fprintf(stderr, | |
80 | "vipw: can't reopen temp file, %s unchanged\n", | |
81 | passwd); | |
82 | goto bad; | |
83 | } | |
84 | ok = 0; | |
85 | while (fgets(buf, sizeof (buf) - 1, ft) != NULL) { | |
86 | register char *cp; | |
87 | ||
88 | cp = index(buf, '\n'); | |
89 | if (cp == 0) | |
90 | continue; | |
91 | *cp = '\0'; | |
92 | cp = index(buf, ':'); | |
93 | if (cp == 0) | |
94 | continue; | |
95 | *cp = '\0'; | |
96 | if (strcmp(buf, "root")) | |
97 | continue; | |
98 | /* password */ | |
99 | cp = index(cp + 1, ':'); | |
100 | if (cp == 0) | |
101 | break; | |
102 | /* uid */ | |
103 | if (atoi(cp + 1) != 0) | |
104 | break; | |
105 | cp = index(cp + 1, ':'); | |
106 | if (cp == 0) | |
107 | break; | |
108 | /* gid */ | |
109 | cp = index(cp + 1, ':'); | |
110 | if (cp == 0) | |
111 | break; | |
112 | /* gecos */ | |
113 | cp = index(cp + 1, ':'); | |
114 | if (cp == 0) | |
115 | break; | |
116 | /* login directory */ | |
117 | if (strncmp(++cp, "/:")) | |
118 | break; | |
119 | cp += 2; | |
120 | if (*cp && strcmp(cp, "/bin/sh") && | |
121 | strcmp(cp, "/bin/csh")) | |
122 | break; | |
123 | ok++; | |
124 | } | |
125 | fclose(ft); | |
126 | if (ok) { | |
127 | if (rename(temp, passwd) < 0) | |
128 | fprintf(stderr, "vipw: "), perror("rename"); | |
6b52f313 RC |
129 | else |
130 | exit(0); | |
4c6b79b5 SL |
131 | } else |
132 | fprintf(stderr, | |
133 | "vipw: you mangled the temp file, %s unchanged\n", | |
134 | passwd); | |
135 | } | |
136 | bad: | |
137 | unlink(temp); | |
6b52f313 | 138 | exit(1); |
4c6b79b5 | 139 | } |