Commit | Line | Data |
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4147b3f6 | 1 | /* fio.c 4.25 82/07/17 */ |
fc96c615 BJ |
2 | |
3 | #include "../h/param.h" | |
4 | #include "../h/systm.h" | |
5 | #include "../h/dir.h" | |
6 | #include "../h/user.h" | |
6459ebe0 | 7 | #include "../h/fs.h" |
fc96c615 BJ |
8 | #include "../h/file.h" |
9 | #include "../h/conf.h" | |
10 | #include "../h/inode.h" | |
11 | #include "../h/reg.h" | |
12 | #include "../h/acct.h" | |
f5b8937b | 13 | #include "../h/mount.h" |
ae921915 BJ |
14 | #include "../h/socket.h" |
15 | #include "../h/socketvar.h" | |
f3156a73 | 16 | #include "../h/proc.h" |
b99ef750 BJ |
17 | #ifdef EFS |
18 | #include "../net/in.h" | |
19 | #include "../h/efs.h" | |
20 | #endif | |
fc96c615 | 21 | |
fc96c615 | 22 | /* |
fdd90ee3 | 23 | * Openi called to allow handler |
fc96c615 BJ |
24 | * of special files to initialize and |
25 | * validate before actual IO. | |
26 | */ | |
b99ef750 BJ |
27 | #ifdef EFS |
28 | openi(ip, rw, trf) | |
29 | #else | |
fc96c615 | 30 | openi(ip, rw) |
b99ef750 | 31 | #endif |
fdd90ee3 | 32 | register struct inode *ip; |
fc96c615 BJ |
33 | { |
34 | dev_t dev; | |
35 | register unsigned int maj; | |
36 | ||
6459ebe0 | 37 | dev = (dev_t)ip->i_rdev; |
fc96c615 | 38 | maj = major(dev); |
fdd90ee3 | 39 | switch (ip->i_mode&IFMT) { |
fc96c615 BJ |
40 | |
41 | case IFCHR: | |
fdd90ee3 | 42 | if (maj >= nchrdev) |
fc96c615 | 43 | goto bad; |
b99ef750 BJ |
44 | #ifdef EFS |
45 | (*cdevsw[maj].d_open)(dev, rw, trf); | |
46 | #else | |
fc96c615 | 47 | (*cdevsw[maj].d_open)(dev, rw); |
b99ef750 | 48 | #endif |
fc96c615 BJ |
49 | break; |
50 | ||
51 | case IFBLK: | |
fdd90ee3 | 52 | if (maj >= nblkdev) |
fc96c615 BJ |
53 | goto bad; |
54 | (*bdevsw[maj].d_open)(dev, rw); | |
55 | } | |
56 | return; | |
57 | ||
58 | bad: | |
59 | u.u_error = ENXIO; | |
60 | } | |
61 | ||
62 | /* | |
63 | * Check mode permission on inode pointer. | |
64 | * Mode is READ, WRITE or EXEC. | |
65 | * In the case of WRITE, the | |
66 | * read-only status of the file | |
67 | * system is checked. | |
68 | * Also in WRITE, prototype text | |
69 | * segments cannot be written. | |
70 | * The mode is shifted to select | |
71 | * the owner/group/other fields. | |
72 | * The super user is granted all | |
73 | * permissions. | |
74 | */ | |
75 | access(ip, mode) | |
fdd90ee3 BJ |
76 | register struct inode *ip; |
77 | int mode; | |
fc96c615 BJ |
78 | { |
79 | register m; | |
80 | ||
81 | m = mode; | |
fdd90ee3 | 82 | if (m == IWRITE) { |
6459ebe0 | 83 | if (ip->i_fs->fs_ronly != 0) { |
fc96c615 | 84 | u.u_error = EROFS; |
fdd90ee3 | 85 | return (1); |
fc96c615 BJ |
86 | } |
87 | if (ip->i_flag&ITEXT) /* try to free text */ | |
88 | xrele(ip); | |
fdd90ee3 | 89 | if (ip->i_flag & ITEXT) { |
fc96c615 | 90 | u.u_error = ETXTBSY; |
fdd90ee3 | 91 | return (1); |
fc96c615 BJ |
92 | } |
93 | } | |
fdd90ee3 BJ |
94 | if (u.u_uid == 0) |
95 | return (0); | |
96 | if (u.u_uid != ip->i_uid) { | |
fc96c615 | 97 | m >>= 3; |
4f4caf05 BJ |
98 | if (ip->i_gid >= NGRPS || |
99 | (u.u_grps[ip->i_gid/(sizeof(int)*8)] & | |
100 | (1 << ip->i_gid%(sizeof(int)*8)) == 0)) | |
fc96c615 BJ |
101 | m >>= 3; |
102 | } | |
fdd90ee3 BJ |
103 | if ((ip->i_mode&m) != 0) |
104 | return (0); | |
fc96c615 | 105 | u.u_error = EACCES; |
fdd90ee3 | 106 | return (1); |
fc96c615 BJ |
107 | } |
108 | ||
109 | /* | |
110 | * Look up a pathname and test if | |
111 | * the resultant inode is owned by the | |
112 | * current user. | |
113 | * If not, try for super-user. | |
114 | * If permission is granted, | |
115 | * return inode pointer. | |
116 | */ | |
117 | struct inode * | |
5485e062 BJ |
118 | owner(follow) |
119 | int follow; | |
fc96c615 BJ |
120 | { |
121 | register struct inode *ip; | |
122 | ||
5485e062 | 123 | ip = namei(uchar, 0, follow); |
fdd90ee3 BJ |
124 | if (ip == NULL) |
125 | return (NULL); | |
b99ef750 BJ |
126 | #ifdef EFS |
127 | /* | |
128 | * References to extended file system are | |
129 | * returned to the caller. | |
130 | */ | |
131 | if (efsinode(ip)) | |
132 | return (ip); | |
133 | #endif | |
fdd90ee3 BJ |
134 | if (u.u_uid == ip->i_uid) |
135 | return (ip); | |
136 | if (suser()) | |
137 | return (ip); | |
fc96c615 | 138 | iput(ip); |
fdd90ee3 | 139 | return (NULL); |
fc96c615 BJ |
140 | } |
141 | ||
142 | /* | |
143 | * Test if the current user is the | |
144 | * super user. | |
145 | */ | |
146 | suser() | |
147 | { | |
148 | ||
fdd90ee3 | 149 | if (u.u_uid == 0) { |
fc96c615 | 150 | u.u_acflag |= ASU; |
fdd90ee3 | 151 | return (1); |
fc96c615 BJ |
152 | } |
153 | u.u_error = EPERM; | |
fdd90ee3 | 154 | return (0); |
fc96c615 | 155 | } |