id-utils.c

   1 /*
   2  * (c) 2010 Cyrill Gorcunov, gorcunov@gmail.com
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or (at
   7  * your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  17  *
  18  * iu-utils backend
  19  */
  20
  21 #include <unistd.h>
  22 #include <stdio.h>
  23 #include <stddef.h>
  24 #include <stdlib.h>
  25 #include <stdarg.h>
  26 #include <string.h>
  27 #include <errno.h>
  28 #include <limits.h>
  29 #include <sys/param.h>
  30 #include <sys/types.h>
  31
  32 #include "id-utils.h"
  33 #include "backend-proto.h"
  34 #include "util.h"
  35
  36 struct idutils_query_result {
  37         struct list_head                list;
  38         void                            *data_copy;
  39         struct backend_proto_item       item;
  40 };
  41
  42 static struct idutils_query_result *idutils_parse(char *name, char *str, unsigned long key)
  43 {
  44         char *func, *file, *line, *text, *data_copy;
  45         struct idutils_query_result *r = NULL;
  46
  47         if (!str || !str[0])
  48                 goto err;
  49
  50         data_copy = xstrdup(str);
  51
  52         func = skip_spaces(name);
  53         file = skip_spaces(strtok(data_copy,    ":"));
  54         line = skip_spaces(strtok(NULL,         ":"));
  55         text = skip_spaces(strtok(NULL,         "\r\n"));
  56
  57         if (!func || !file || !line || !text) {
  58                 free(data_copy);
  59                 goto err;
  60         }
  61
  62         r = xzalloc(sizeof(*r));
  63
  64         r->data_copy    = data_copy;
  65         r->item.key     = key;
  66         r->item.func    = xstrdup(func);
  67         r->item.file    = file;
  68         r->item.line    = atoi(line);
  69         r->item.text    = text;
  70
  71         INIT_LIST_HEAD(&r->list);
  72
  73 err:
  74         return r;
  75 }
  76
  77 static void idutils_query_free(struct list_head *head)
  78 {
  79         struct idutils_query_result *r, *n;
  80
  81         list_for_each_entry_safe(r, n, head, list) {
  82                 free(r->item.func);
  83                 free(r->data_copy);
  84                 free(r);
  85         }
  86 }
  87
  88 #define MAX_CMDLINE 256
  89 static const char idutils_cmd[] = "gid ";
  90 static const char rebuild_cmd[] = "mkid ";
  91
  92 static struct list_head *idutils_query(struct backend_proto_query_params *backend_params)
  93 {
  94         char cmd_buf[MAX_CMDLINE] = { 0 };
  95         char read_buf[1024];
  96         struct idutils_query_result *r;
  97         struct list_head *head = NULL;
  98         unsigned long key = 0;
  99         FILE *pipe;
 100
 101         if (!backend_params->u.idutils.name     ||
 102                 !*backend_params->u.idutils.name)
 103                 return NULL;
 104
 105 #define strlcat_buf(str) strlcat(cmd_buf, str, sizeof(cmd_buf))
 106         strlcat_buf(idutils_cmd);
 107         strlcat_buf(backend_params->u.idutils.name);
 108 #undef strlcat_buf
 109
 110         head = xalloc(sizeof(*head));
 111         INIT_LIST_HEAD(head);
 112
 113         pipe = popen(cmd_buf, "r");
 114         if (!pipe) {
 115                 warning("Can't open pipe for : %s", idutils_cmd);
 116                 free(head), head = NULL;
 117                 goto err;
 118         }
 119
 120         /*
 121          * We assume the output line will not exceed the buffer
 122          * otherwise the parsing would not be strictly correct
 123          */
 124         while (fgets(read_buf, sizeof(read_buf), pipe)) {
 125                 r = idutils_parse(backend_params->u.idutils.name, read_buf, key++);
 126                 if (r)
 127                         list_add(&r->list, head);
 128         }
 129         if (pclose(pipe))
 130                 warning("Closing pipe for parsing '%s' failed",
 131                         backend_params->u.idutils.name);
 132
 133 err:
 134         return head;
 135 }
 136
 137 static struct idutils_query_result *idutils_lookup_key(struct list_head *head, unsigned long key)
 138 {
 139         struct idutils_query_result *t;
 140         list_for_each_entry(t, head, list) {
 141                 if (t->item.key == key)
 142                         return t;
 143         }
 144         return NULL;
 145 }
 146
 147 static int idutils_backend_proto_lookup(struct list_head *head, struct backend_proto_item *item, unsigned long key)
 148 {
 149         struct idutils_query_result *t = idutils_lookup_key(head, key);
 150         if (!t)
 151                 return -1;
 152         memcpy(item, &t->item, sizeof(*item));
 153         return 0;
 154 }
 155
 156 static int idutils_backend_proto_get(struct list_head *entry, struct backend_proto_item *item)
 157 {
 158         struct idutils_query_result *t = container_of(entry, struct idutils_query_result, list);
 159         memcpy(item, &t->item, sizeof(*item));
 160         return 0;
 161 }
 162
 163 static void idutils_backend_proto_destory(struct list_head *entry)
 164 {
 165         struct idutils_query_result *t = container_of(entry, struct idutils_query_result, list);
 166         idutils_query_free(&t->list);
 167         free(t);
 168 }
 169
 170 static void idutils_backend_proto_refresh(void)
 171 {
 172         FILE *pipe;
 173
 174         pipe = popen(rebuild_cmd, "r");
 175         if (!pipe) {
 176                 warning("Can't open pipe for : %s", rebuild_cmd);
 177                 return;
 178         }
 179
 180         if (pclose(pipe))
 181                 warning("Closing pipe for parsing '%s' failed",
 182                         rebuild_cmd);
 183 }
 184
 185 void init_id_utils_backend_proto(void)
 186 {
 187         static struct backend_proto proto = {
 188                 .protocol_name          = "id-utils",
 189                 .protocol               = BACKEND_PROTO_ID_UTILS,
 190                 .backend_proto_query    = idutils_query,
 191                 .backend_proto_get      = idutils_backend_proto_get,
 192                 .backend_proto_lookup   = idutils_backend_proto_lookup,
 193                 .backend_proto_destory  = idutils_backend_proto_destory,
 194                 .backend_proto_refresh  = idutils_backend_proto_refresh,
 195         };
 196
 197         backend_proto_register(&proto);
 198 }