diff options
Diffstat (limited to 'src/shared/journal-util.c')
| -rw-r--r-- | src/shared/journal-util.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/src/shared/journal-util.c b/src/shared/journal-util.c index fff3dfc9d1..eb7a75295f 100644 --- a/src/shared/journal-util.c +++ b/src/shared/journal-util.c @@ -1,3 +1,4 @@ +/* SPDX-License-Identifier: LGPL-2.1+ */ /*** This file is part of systemd. @@ -149,3 +150,41 @@ int journal_access_check_and_warn(sd_journal *j, bool quiet) { return r; } + +bool journal_field_valid(const char *p, size_t l, bool allow_protected) { + const char *a; + + /* We kinda enforce POSIX syntax recommendations for + environment variables here, but make a couple of additional + requirements. + + http://pubs.opengroup.org/onlinepubs/000095399/basedefs/xbd_chap08.html */ + + if (l == (size_t) -1) + l = strlen(p); + + /* No empty field names */ + if (l <= 0) + return false; + + /* Don't allow names longer than 64 chars */ + if (l > 64) + return false; + + /* Variables starting with an underscore are protected */ + if (!allow_protected && p[0] == '_') + return false; + + /* Don't allow digits as first character */ + if (p[0] >= '0' && p[0] <= '9') + return false; + + /* Only allow A-Z0-9 and '_' */ + for (a = p; a < p + l; a++) + if ((*a < 'A' || *a > 'Z') && + (*a < '0' || *a > '9') && + *a != '_') + return false; + + return true; +} |