git.ozlabs.org Git - petitboot/blob - discover/parser.c

   1
   2 #include <fcntl.h>
   3 #include <stdlib.h>
   4 #include <sys/types.h>
   5 #include <sys/stat.h>
   6
   7 #include "types/types.h"
   8 #include <log/log.h>
   9 #include <talloc/talloc.h>
  10
  11 #include "device-handler.h"
  12 #include "parser.h"
  13 #include "parser-utils.h"
  14 #include "paths.h"
  15 #include "file.h"
  16
  17 struct p_item {
  18         struct list_item list;
  19         struct parser *parser;
  20 };
  21
  22 STATIC_LIST(parsers);
  23
  24 static char *local_path(struct discover_context *ctx,
  25                 struct discover_device *dev,
  26                 const char *filename)
  27 {
  28         return join_paths(ctx, dev->mount_path, filename);
  29 }
  30
  31 int parser_request_file(struct discover_context *ctx,
  32                 struct discover_device *dev, const char *filename,
  33                 char **buf, int *len)
  34
  35 {
  36         char *path;
  37         int rc;
  38
  39         /* we only support local files at present */
  40         if (!dev->mount_path)
  41                 return -1;
  42
  43         path = local_path(ctx, dev, filename);
  44
  45         rc = read_file(ctx, path, buf, len);
  46
  47         talloc_free(path);
  48
  49         return rc;
  50 }
  51
  52 int parser_replace_file(struct discover_context *ctx,
  53                 struct discover_device *dev, const char *filename,
  54                 char *buf, int len)
  55 {
  56         bool release;
  57         char *path;
  58         int rc;
  59
  60         if (!dev->mounted)
  61                 return -1;
  62
  63         rc = device_request_write(dev, &release);
  64         if (rc) {
  65                 pb_log("Can't write file %s: device doesn't allow write\n",
  66                                 dev->device_path);
  67                 return -1;
  68         }
  69
  70         path = local_path(ctx, dev, filename);
  71
  72         rc = replace_file(path, buf, len);
  73
  74         talloc_free(path);
  75
  76         device_release_write(dev, release);
  77
  78         return rc;
  79 }
  80
  81 static int download_config(struct discover_context *ctx, char **buf, int *len)
  82 {
  83         struct load_url_result *result;
  84         int rc;
  85
  86         result = load_url(ctx, ctx->conf_url);
  87         if (!result)
  88                 return -1;
  89
  90         rc = read_file(ctx, result->local, buf, len);
  91         if (rc)
  92                 goto out_clean;
  93
  94         return 0;
  95
  96 out_clean:
  97         if (result->cleanup_local)
  98                 unlink(result->local);
  99         return -1;
 100 }
 101
 102 static void iterate_parser_files(struct discover_context *ctx,
 103                 const struct parser *parser)
 104 {
 105         const char * const *filename;
 106         const char *path;
 107
 108         if (!parser->filenames)
 109                 return;
 110
 111         for (filename = parser->filenames; *filename; filename++) {
 112                 int rc, len;
 113                 char *buf;
 114
 115                 path = local_path(ctx, ctx->device, *filename);
 116                 if (!path)
 117                         continue;
 118
 119                 rc = read_file(ctx, path, &buf, &len);
 120                 if (!rc) {
 121                         pb_log("Running parser %s on file %s\n",
 122                                         parser->name, *filename);
 123                         parser->parse(ctx, buf, len);
 124                         talloc_free(buf);
 125                 }
 126         }
 127 }
 128
 129 void iterate_parsers(struct discover_context *ctx, enum conf_method method)
 130 {
 131         struct p_item* i;
 132         int rc, len;
 133         char *buf;
 134
 135         pb_log("trying parsers for %s\n", ctx->device->device->id);
 136
 137         switch (method) {
 138         case CONF_METHOD_LOCAL_FILE:
 139                 list_for_each_entry(&parsers, i, list) {
 140                         if (i->parser->method != CONF_METHOD_LOCAL_FILE)
 141                                 continue;
 142
 143                         pb_log("\ttrying parser '%s'\n", i->parser->name);
 144                         ctx->parser = i->parser;
 145                         iterate_parser_files(ctx, ctx->parser);
 146                 }
 147                 ctx->parser = NULL;
 148                 break;
 149
 150         case CONF_METHOD_DHCP:
 151                 rc = download_config(ctx, &buf, &len);
 152                 if (rc) {
 153                         pb_log("\tdownload failed, aborting\n");
 154                         return;
 155                 }
 156
 157                 list_for_each_entry(&parsers, i, list) {
 158                         if (i->parser->method != method)
 159                                 continue;
 160
 161                         pb_log("\ttrying parser '%s'\n", i->parser->name);
 162                         ctx->parser = i->parser;
 163                         i->parser->parse(ctx, buf, len);
 164                 }
 165
 166                 break;
 167
 168         case CONF_METHOD_UNKNOWN:
 169                 break;
 170
 171         }
 172 }
 173
 174 static void *parsers_ctx;
 175
 176 void __register_parser(struct parser *parser)
 177 {
 178         struct p_item *i;
 179
 180         if (!parsers_ctx)
 181                 parsers_ctx = talloc_new(NULL);
 182
 183         i = talloc(parsers_ctx, struct p_item);
 184         i->parser = parser;
 185         list_add(&parsers, &i->list);
 186 }
 187
 188 static __attribute__((destructor)) void cleanup_parsers(void)
 189 {
 190         talloc_free(parsers_ctx);
 191 }
 192
 193 void parser_init(void)
 194 {
 195 }