| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame^] | 1 | /* Prototype for the setgrent functions we use here. */ |
| 2 | typedef enum nss_status (*set_function) (void); |
| 3 | |
| 4 | /* Prototype for the endgrent functions we use here. */ |
| 5 | typedef enum nss_status (*end_function) (void); |
| 6 | |
| 7 | /* Prototype for the setgrent functions we use here. */ |
| 8 | typedef enum nss_status (*get_function) (struct group *, char *, |
| 9 | size_t, int *); |
| 10 | |
| 11 | |
| 12 | static enum nss_status |
| 13 | compat_call (service_user *nip, const char *user, gid_t group, long int *start, |
| 14 | long int *size, gid_t **groupsp, long int limit, int *errnop) |
| 15 | { |
| 16 | struct group grpbuf; |
| 17 | enum nss_status status; |
| 18 | set_function setgrent_fct; |
| 19 | get_function getgrent_fct; |
| 20 | end_function endgrent_fct; |
| 21 | gid_t *groups = *groupsp; |
| 22 | |
| 23 | getgrent_fct = __nss_lookup_function (nip, "getgrent_r"); |
| 24 | if (getgrent_fct == NULL) |
| 25 | return NSS_STATUS_UNAVAIL; |
| 26 | |
| 27 | setgrent_fct = __nss_lookup_function (nip, "setgrent"); |
| 28 | if (setgrent_fct) |
| 29 | { |
| 30 | status = DL_CALL_FCT (setgrent_fct, ()); |
| 31 | if (status != NSS_STATUS_SUCCESS) |
| 32 | return status; |
| 33 | } |
| 34 | |
| 35 | endgrent_fct = __nss_lookup_function (nip, "endgrent"); |
| 36 | |
| 37 | struct scratch_buffer tmpbuf; |
| 38 | scratch_buffer_init (&tmpbuf); |
| 39 | enum nss_status result = NSS_STATUS_SUCCESS; |
| 40 | |
| 41 | do |
| 42 | { |
| 43 | while ((status = DL_CALL_FCT (getgrent_fct, |
| 44 | (&grpbuf, tmpbuf.data, tmpbuf.length, |
| 45 | errnop)), |
| 46 | status == NSS_STATUS_TRYAGAIN) |
| 47 | && *errnop == ERANGE) |
| 48 | { |
| 49 | if (!scratch_buffer_grow (&tmpbuf)) |
| 50 | { |
| 51 | result = NSS_STATUS_TRYAGAIN; |
| 52 | goto done; |
| 53 | } |
| 54 | } |
| 55 | |
| 56 | if (status != NSS_STATUS_SUCCESS) |
| 57 | goto done; |
| 58 | |
| 59 | if (grpbuf.gr_gid != group) |
| 60 | { |
| 61 | char **m; |
| 62 | |
| 63 | for (m = grpbuf.gr_mem; *m != NULL; ++m) |
| 64 | if (strcmp (*m, user) == 0) |
| 65 | { |
| 66 | /* Check whether the group is already on the list. */ |
| 67 | long int cnt; |
| 68 | for (cnt = 0; cnt < *start; ++cnt) |
| 69 | if (groups[cnt] == grpbuf.gr_gid) |
| 70 | break; |
| 71 | |
| 72 | if (cnt == *start) |
| 73 | { |
| 74 | /* Matches user and not yet on the list. Insert |
| 75 | this group. */ |
| 76 | if (__glibc_unlikely (*start == *size)) |
| 77 | { |
| 78 | /* Need a bigger buffer. */ |
| 79 | gid_t *newgroups; |
| 80 | long int newsize; |
| 81 | |
| 82 | if (limit > 0 && *size == limit) |
| 83 | /* We reached the maximum. */ |
| 84 | goto done; |
| 85 | |
| 86 | if (limit <= 0) |
| 87 | newsize = 2 * *size; |
| 88 | else |
| 89 | newsize = MIN (limit, 2 * *size); |
| 90 | |
| 91 | newgroups = realloc (groups, |
| 92 | newsize * sizeof (*groups)); |
| 93 | if (newgroups == NULL) |
| 94 | goto done; |
| 95 | *groupsp = groups = newgroups; |
| 96 | *size = newsize; |
| 97 | } |
| 98 | |
| 99 | groups[*start] = grpbuf.gr_gid; |
| 100 | *start += 1; |
| 101 | } |
| 102 | |
| 103 | break; |
| 104 | } |
| 105 | } |
| 106 | } |
| 107 | while (status == NSS_STATUS_SUCCESS); |
| 108 | |
| 109 | done: |
| 110 | scratch_buffer_free (&tmpbuf); |
| 111 | |
| 112 | if (endgrent_fct) |
| 113 | DL_CALL_FCT (endgrent_fct, ()); |
| 114 | |
| 115 | return result; |
| 116 | } |