Samuel Tan | d7ed851 | 2015-08-13 16:11:35 -0700 | [diff] [blame] | 1 | /* |
| 2 | * dhcpcd - DHCP client daemon |
| 3 | * Copyright (c) 2006-2015 Roy Marples <roy@marples.name> |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * 1. Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in the |
| 12 | * documentation and/or other materials provided with the distribution. |
| 13 | * |
| 14 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
| 15 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 16 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 17 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| 18 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 19 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 20 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 21 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 22 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 23 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 24 | * SUCH DAMAGE. |
| 25 | */ |
| 26 | |
| 27 | #include <dirent.h> |
| 28 | #include <dlfcn.h> |
| 29 | #include <stdio.h> |
| 30 | #include <stdlib.h> |
| 31 | #include <string.h> |
| 32 | |
| 33 | #define _INDEV |
| 34 | #include "common.h" |
| 35 | #include "dev.h" |
| 36 | #include "eloop.h" |
| 37 | #include "dhcpcd.h" |
| 38 | |
| 39 | int |
| 40 | dev_initialized(struct dhcpcd_ctx *ctx, const char *ifname) |
| 41 | { |
| 42 | |
| 43 | if (ctx->dev == NULL) |
| 44 | return 1; |
| 45 | return ctx->dev->initialized(ifname); |
| 46 | } |
| 47 | |
| 48 | int |
| 49 | dev_listening(struct dhcpcd_ctx *ctx) |
| 50 | { |
| 51 | |
| 52 | if (ctx->dev == NULL) |
| 53 | return 0; |
| 54 | return ctx->dev->listening(); |
| 55 | } |
| 56 | |
| 57 | static void |
| 58 | dev_stop1(struct dhcpcd_ctx *ctx, int stop) |
| 59 | { |
| 60 | |
| 61 | if (ctx->dev) { |
| 62 | if (stop) |
| 63 | logger(ctx, LOG_DEBUG, |
| 64 | "dev: unloaded %s", ctx->dev->name); |
| 65 | eloop_event_delete(ctx->eloop, ctx->dev_fd, 0); |
| 66 | ctx->dev->stop(); |
| 67 | free(ctx->dev); |
| 68 | ctx->dev = NULL; |
| 69 | ctx->dev_fd = -1; |
| 70 | } |
| 71 | if (ctx->dev_handle) { |
| 72 | dlclose(ctx->dev_handle); |
| 73 | ctx->dev_handle = NULL; |
| 74 | } |
| 75 | } |
| 76 | |
| 77 | void |
| 78 | dev_stop(struct dhcpcd_ctx *ctx) |
| 79 | { |
| 80 | |
| 81 | dev_stop1(ctx,!(ctx->options & DHCPCD_FORKED)); |
| 82 | } |
| 83 | |
| 84 | static int |
| 85 | dev_start2(struct dhcpcd_ctx *ctx, const char *name) |
| 86 | { |
| 87 | char file[PATH_MAX]; |
| 88 | void *h; |
| 89 | void (*fptr)(struct dev *, const struct dev_dhcpcd *); |
| 90 | int r; |
| 91 | struct dev_dhcpcd dev_dhcpcd; |
| 92 | |
| 93 | snprintf(file, sizeof(file), DEVDIR "/%s", name); |
| 94 | h = dlopen(file, RTLD_LAZY); |
| 95 | if (h == NULL) { |
| 96 | logger(ctx, LOG_ERR, "dlopen: %s", dlerror()); |
| 97 | return -1; |
| 98 | } |
| 99 | fptr = (void (*)(struct dev *, const struct dev_dhcpcd *)) |
| 100 | dlsym(h, "dev_init"); |
| 101 | if (fptr == NULL) { |
| 102 | logger(ctx, LOG_ERR, "dlsym: %s", dlerror()); |
| 103 | dlclose(h); |
| 104 | return -1; |
| 105 | } |
| 106 | ctx->dev = calloc(1, sizeof(*ctx->dev)); |
| 107 | dev_dhcpcd.handle_interface = &dhcpcd_handleinterface; |
| 108 | fptr(ctx->dev, &dev_dhcpcd); |
| 109 | if (ctx->dev->start == NULL || (r = ctx->dev->start()) == -1) { |
| 110 | free(ctx->dev); |
| 111 | ctx->dev = NULL; |
| 112 | dlclose(h); |
| 113 | return -1; |
| 114 | } |
| 115 | logger(ctx, LOG_INFO, "dev: loaded %s", ctx->dev->name); |
| 116 | ctx->dev_handle = h; |
| 117 | return r; |
| 118 | } |
| 119 | |
| 120 | static int |
| 121 | dev_start1(struct dhcpcd_ctx *ctx) |
| 122 | { |
| 123 | DIR *dp; |
| 124 | struct dirent *d; |
| 125 | int r; |
| 126 | |
| 127 | if (ctx->dev) { |
| 128 | logger(ctx, LOG_ERR, "dev: already started %s", ctx->dev->name); |
| 129 | return -1; |
| 130 | } |
| 131 | |
| 132 | if (ctx->dev_load) |
| 133 | return dev_start2(ctx, ctx->dev_load); |
| 134 | |
| 135 | dp = opendir(DEVDIR); |
| 136 | if (dp == NULL) { |
| 137 | logger(ctx, LOG_DEBUG, "dev: %s: %m", DEVDIR); |
| 138 | return 0; |
| 139 | } |
| 140 | |
| 141 | r = 0; |
| 142 | while ((d = readdir(dp))) { |
| 143 | if (d->d_name[0] == '.') |
| 144 | continue; |
| 145 | |
| 146 | r = dev_start2(ctx, d->d_name); |
| 147 | if (r != -1) |
| 148 | break; |
| 149 | } |
| 150 | closedir(dp); |
| 151 | return r; |
| 152 | } |
| 153 | |
| 154 | static void |
| 155 | dev_handle_data(void *arg) |
| 156 | { |
| 157 | struct dhcpcd_ctx *ctx; |
| 158 | |
| 159 | ctx = arg; |
| 160 | if (ctx->dev->handle_device(arg) == -1) { |
| 161 | /* XXX: an error occured. should we restart dev? */ |
| 162 | } |
| 163 | } |
| 164 | |
| 165 | int |
| 166 | dev_start(struct dhcpcd_ctx *ctx) |
| 167 | { |
| 168 | |
| 169 | if (ctx->dev_fd != -1) { |
| 170 | logger(ctx, LOG_ERR, "%s: already started on fd %d", __func__, |
| 171 | ctx->dev_fd); |
| 172 | return ctx->dev_fd; |
| 173 | } |
| 174 | |
| 175 | ctx->dev_fd = dev_start1(ctx); |
| 176 | if (ctx->dev_fd != -1) { |
| 177 | if (eloop_event_add(ctx->eloop, |
| 178 | ctx->dev_fd, dev_handle_data, ctx, NULL, NULL) == -1) |
| 179 | { |
| 180 | logger(ctx, LOG_ERR, |
| 181 | "%s: eloop_event_add: %m", __func__); |
| 182 | dev_stop1(ctx, 1); |
| 183 | return -1; |
| 184 | } |
| 185 | } |
| 186 | |
| 187 | return ctx->dev_fd; |
| 188 | } |