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isolate/config.c
| 168 lines
| 3.1 KiB
| text/x-c
| CLexer
|
| r256 | /* | |||
| * Process Isolator -- Configuration File | ||||
| * | ||||
| * (c) 2016 Martin Mares <mj@ucw.cz> | ||||
| */ | ||||
| #include "isolate.h" | ||||
| #include <errno.h> | ||||
| #include <stdio.h> | ||||
| #include <stdlib.h> | ||||
| #include <string.h> | ||||
| #define MAX_LINE_LEN 1024 | ||||
| char *cf_box_root; | ||||
| char *cf_cg_root; | ||||
| char *cf_cg_parent; | ||||
| int cf_first_uid; | ||||
| int cf_first_gid; | ||||
| int cf_num_boxes; | ||||
| static int line_number; | ||||
| static struct cf_per_box *per_box_configs; | ||||
| static void NONRET | ||||
| cf_err(char *msg) | ||||
| { | ||||
| die("Error in config file, line %d: %s", line_number, msg); | ||||
| } | ||||
| static char * | ||||
| cf_string(char *val) | ||||
| { | ||||
| return xstrdup(val); | ||||
| } | ||||
| static int | ||||
| cf_int(char *val) | ||||
| { | ||||
| char *end; | ||||
| errno = 0; | ||||
| long int x = strtol(val, &end, 10); | ||||
| if (errno || end == val || end && *end) | ||||
| cf_err("Invalid number"); | ||||
| if ((long int)(int) x != x) | ||||
| cf_err("Number out of range"); | ||||
| return x; | ||||
| } | ||||
| static void | ||||
| cf_entry_toplevel(char *key, char *val) | ||||
| { | ||||
| if (!strcmp(key, "box_root")) | ||||
| cf_box_root = cf_string(val); | ||||
| else if (!strcmp(key, "cg_root")) | ||||
| cf_cg_root = cf_string(val); | ||||
| else if (!strcmp(key, "cg_parent")) | ||||
| cf_cg_parent = cf_string(val); | ||||
| else if (!strcmp(key, "first_uid")) | ||||
| cf_first_uid = cf_int(val); | ||||
| else if (!strcmp(key, "first_gid")) | ||||
| cf_first_gid = cf_int(val); | ||||
| else if (!strcmp(key, "num_boxes")) | ||||
| cf_num_boxes = cf_int(val); | ||||
| else | ||||
| cf_err("Unknown configuration item"); | ||||
| } | ||||
| static void | ||||
| cf_entry_compound(char *key, char *subkey, char *val) | ||||
| { | ||||
| if (strncmp(key, "box", 3)) | ||||
| cf_err("Unknown configuration section"); | ||||
| int box_id = cf_int(key + 3); | ||||
| struct cf_per_box *c = cf_per_box(box_id); | ||||
| if (!strcmp(subkey, "cpus")) | ||||
| c->cpus = cf_string(val); | ||||
| else if (!strcmp(subkey, "mems")) | ||||
| c->mems = cf_string(val); | ||||
| else | ||||
| cf_err("Unknown per-box configuration item"); | ||||
| } | ||||
| static void | ||||
| cf_entry(char *key, char *val) | ||||
| { | ||||
| char *dot = strchr(key, '.'); | ||||
| if (!dot) | ||||
| cf_entry_toplevel(key, val); | ||||
| else | ||||
| { | ||||
| *dot++ = 0; | ||||
| cf_entry_compound(key, dot, val); | ||||
| } | ||||
| } | ||||
| static void | ||||
| cf_check(void) | ||||
| { | ||||
| if (!cf_box_root || | ||||
| !cf_cg_root || | ||||
| !cf_first_uid || | ||||
| !cf_first_gid || | ||||
| !cf_num_boxes) | ||||
| cf_err("Configuration is not complete"); | ||||
| } | ||||
| void | ||||
| cf_parse(void) | ||||
| { | ||||
| FILE *f = fopen(CONFIG_FILE, "r"); | ||||
| if (!f) | ||||
| die("Cannot open %s: %m", CONFIG_FILE); | ||||
| char line[MAX_LINE_LEN]; | ||||
| while (fgets(line, sizeof(line), f)) | ||||
| { | ||||
| line_number++; | ||||
| char *nl = strchr(line, '\n'); | ||||
| if (!nl) | ||||
| cf_err("Line not terminated or too long"); | ||||
| *nl = 0; | ||||
| if (!line[0] || line[0] == '#') | ||||
| continue; | ||||
| char *s = line; | ||||
| while (*s && *s != ' ' && *s != '\t' && *s != '=') | ||||
| s++; | ||||
| while (*s == ' ' || *s == '\t') | ||||
| *s++ = 0; | ||||
| if (*s != '=') | ||||
| cf_err("Syntax error, expecting key=value"); | ||||
| *s++ = 0; | ||||
| while (*s == ' ' || *s == '\t') | ||||
| *s++ = 0; | ||||
| cf_entry(line, s); | ||||
| } | ||||
| fclose(f); | ||||
| cf_check(); | ||||
| } | ||||
| struct cf_per_box * | ||||
| cf_per_box(int box_id) | ||||
| { | ||||
| struct cf_per_box *c; | ||||
| for (c = per_box_configs; c; c = c->next) | ||||
| if (c->box_id == box_id) | ||||
| return c; | ||||
| c = xmalloc(sizeof(*c)); | ||||
| memset(c, 0, sizeof(*c)); | ||||
| c->next = per_box_configs; | ||||
| per_box_configs = c; | ||||
| c->box_id = box_id; | ||||
| return c; | ||||
| } | ||||
| struct cf_per_box * | ||||
| cf_current_box(void) | ||||
| { | ||||
| return cf_per_box(box_id); | ||||
| } | ||||