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                 const char *filename)
  26 {
  27         return join_paths(ctx, ctx->device->mount_path, filename);
  28 }
  29
  30 static int download_config(struct discover_context *ctx, char **buf, int *len)
  31 {
  32         unsigned tempfile;
  33         const char *file;
  34         int rc;
  35
  36         file = load_url(ctx, ctx->conf_url, &tempfile);
  37         if (!file)
  38                 return -1;
  39
  40         rc = read_file(ctx, file, buf, len);
  41         if (rc)
  42                 goto out_clean;
  43
  44         return 0;
  45
  46 out_clean:
  47         if (tempfile)
  48                 unlink(file);
  49         return -1;
  50 }
  51
  52 static void iterate_parser_files(struct discover_context *ctx,
  53                 const struct parser *parser)
  54 {
  55         const char * const *filename;
  56         const char *path;
  57
  58         if (!parser->filenames)
  59                 return;
  60
  61         for (filename = parser->filenames; *filename; filename++) {
  62                 int rc, len;
  63                 char *buf;
  64
  65                 path = local_path(ctx, *filename);
  66                 if (!path)
  67                         continue;
  68
  69                 rc = read_file(ctx, path, &buf, &len);
  70                 if (!rc) {
  71                         pb_log("Running parser %s on file %s\n",
  72                                         parser->name, *filename);
  73                         parser->parse(ctx, buf, len);
  74                         talloc_free(buf);
  75                 }
  76         }
  77 }
  78
  79 void iterate_parsers(struct discover_context *ctx, enum conf_method method)
  80 {
  81         struct p_item* i;
  82         int rc, len;
  83         char *buf;
  84
  85         pb_log("trying parsers for %s\n", ctx->device->device->id);
  86
  87         switch (method) {
  88         case CONF_METHOD_LOCAL_FILE:
  89                 list_for_each_entry(&parsers, i, list) {
  90                         if (i->parser->method != CONF_METHOD_LOCAL_FILE)
  91                                 continue;
  92
  93                         pb_log("\ttrying parser '%s'\n", i->parser->name);
  94                         ctx->parser = i->parser;
  95                         iterate_parser_files(ctx, ctx->parser);
  96                 }
  97                 ctx->parser = NULL;
  98                 break;
  99
 100         case CONF_METHOD_DHCP:
 101                 rc = download_config(ctx, &buf, &len);
 102                 if (rc) {
 103                         pb_log("\tdownload failed, aborting\n");
 104                         return;
 105                 }
 106
 107                 list_for_each_entry(&parsers, i, list) {
 108                         if (i->parser->method != method)
 109                                 continue;
 110
 111                         pb_log("\ttrying parser '%s'\n", i->parser->name);
 112                         ctx->parser = i->parser;
 113                         i->parser->parse(ctx, buf, len);
 114                 }
 115
 116                 break;
 117
 118         case CONF_METHOD_UNKNOWN:
 119                 break;
 120
 121         }
 122 }
 123
 124 void __register_parser(struct parser *parser)
 125 {
 126         struct p_item* i = talloc(NULL, struct p_item);
 127
 128         printf("%s: %s\n", __func__, parser->name);
 129
 130         i->parser = parser;
 131         list_add(&parsers, &i->list);
 132 }
 133
 134 void parser_init(void)
 135 {
 136 }