~mdw / disorder / blame
| Commit | Line | Data |
|---|---|---|
| 7f7c3819 RK |
1 | /* |
| 2 | * This file is part of DisOrder | |
| 3 | * Copyright (C) 2009 Richard Kettlewell | |
| 4 | * | |
| 5 | * This program is free software; you can redistribute it and/or modify | |
| 6 | * it under the terms of the GNU General Public License as published by | |
| 7 | * the Free Software Foundation; either version 2 of the License, or | |
| 8 | * (at your option) any later version. | |
| 9 | * | |
| 10 | * This program is distributed in the hope that it will be useful, but | |
| 11 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 | * General Public License for more details. | |
| 14 | * | |
| 15 | * You should have received a copy of the GNU General Public License | |
| 16 | * along with this program; if not, write to the Free Software | |
| 17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 | |
| 18 | * USA | |
| 19 | */ | |
| 20 | /** @file lib/validity.c | |
| 21 | * @brief Various validity checks | |
| 22 | */ | |
| 23 | #include "common.h" | |
| 24 | #include "validity.h" | |
| 25 | ||
| 26 | #include "mem.h" | |
| 27 | ||
| 28 | /** @brief Parse a playlist name | |
| 29 | * @param name Playlist name | |
| 30 | * @param ownerp Where to put owner, or NULL | |
| 31 | * @param sharep Where to put default sharing, or NULL | |
| 32 | * @return 0 on success, -1 on error | |
| 33 | * | |
| 34 | * Playlists take the form USER.PLAYLIST or just PLAYLIST. The PLAYLIST part | |
| 35 | * is alphanumeric and nonempty. USER is a username (see valid_username()). | |
| 36 | */ | |
| 37 | int playlist_parse_name(const char *name, | |
| 38 | char **ownerp, | |
| 39 | char **sharep) { | |
| 40 | const char *dot = strchr(name, '.'), *share; | |
| 41 | char *owner; | |
| 42 | ||
| 43 | if(dot) { | |
| 44 | /* Owned playlist */ | |
| 45 | owner = xstrndup(name, dot - name); | |
| 46 | if(!valid_username(owner)) | |
| 47 | return -1; | |
| 48 | if(!valid_username(dot + 1)) | |
| 49 | return -1; | |
| 50 | share = "private"; | |
| 51 | } else { | |
| 52 | /* Shared playlist */ | |
| 53 | if(!valid_username(name)) | |
| 54 | return -1; | |
| 55 | owner = 0; | |
| 56 | share = "shared"; | |
| 57 | } | |
| 58 | if(ownerp) | |
| 59 | *ownerp = owner; | |
| 60 | if(sharep) | |
| 61 | *sharep = xstrdup(share); | |
| 62 | return 0; | |
| 63 | } | |
| 64 | ||
| 65 | /** @brief Return non-zero for a valid username | |
| 66 | * @param user Candidate username | |
| 67 | * @return Nonzero if it's valid | |
| 68 | * | |
| 69 | * Currently we only allow the letters and digits in ASCII. We could be more | |
| 70 | * liberal than this but it is a nice simple test. It is critical that | |
| 71 | * semicolons are never allowed. | |
| 72 | * | |
| 73 | * NB also used by playlist_parse_name() to validate playlist names! | |
| 74 | */ | |
| 75 | int valid_username(const char *user) { | |
| 76 | if(!*user) | |
| 77 | return 0; | |
| 78 | while(*user) { | |
| 79 | const uint8_t c = *user++; | |
| 80 | /* For now we are very strict */ | |
| 81 | if((c >= 'a' && c <= 'z') | |
| 82 | || (c >= 'A' && c <= 'Z') | |
| 83 | || (c >= '0' && c <= '9')) | |
| 84 | /* ok */; | |
| 85 | else | |
| 86 | return 0; | |
| 87 | } | |
| 88 | return 1; | |
| 89 | } | |
| 90 | ||
| 91 | /* | |
| 92 | Local Variables: | |
| 93 | c-basic-offset:2 | |
| 94 | comment-column:40 | |
| 95 | fill-column:79 | |
| 96 | indent-tabs-mode:nil | |
| 97 | End: | |
| 98 | */ |