X-Git-Url: https://git.grml.org/?a=blobdiff_plain;f=udhcp%2Fscript.c;fp=udhcp%2Fscript.c;h=0000000000000000000000000000000000000000;hb=2d9408b518952bb6d3d31574c0be38c362bf7489;hp=820fbb06419041edbdeb0c3cbe55b4fbabb72486;hpb=c9a6e0699a68fd2bce645ede37a9d5653c60c319;p=grml-terminalserver.git diff --git a/udhcp/script.c b/udhcp/script.c deleted file mode 100644 index 820fbb0..0000000 --- a/udhcp/script.c +++ /dev/null @@ -1,233 +0,0 @@ -/* script.c - * - * Functions to call the DHCP client notification scripts - * - * Russ Dill July 2001 - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - */ - -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include "options.h" -#include "dhcpd.h" -#include "dhcpc.h" -#include "common.h" - -/* get a rough idea of how long an option will be (rounding up...) */ -static const int max_option_length[] = { - [OPTION_IP] = sizeof("255.255.255.255 "), - [OPTION_IP_PAIR] = sizeof("255.255.255.255 ") * 2, - [OPTION_STRING] = 1, - [OPTION_BOOLEAN] = sizeof("yes "), - [OPTION_U8] = sizeof("255 "), - [OPTION_U16] = sizeof("65535 "), - [OPTION_S16] = sizeof("-32768 "), - [OPTION_U32] = sizeof("4294967295 "), - [OPTION_S32] = sizeof("-2147483684 "), -}; - - -static inline int upper_length(int length, int opt_index) -{ - return max_option_length[opt_index] * - (length / option_lengths[opt_index]); -} - - -static int sprintip(char *dest, char *pre, uint8_t *ip) -{ - return sprintf(dest, "%s%d.%d.%d.%d", pre, ip[0], ip[1], ip[2], ip[3]); -} - - -/* really simple implementation, just count the bits */ -static int mton(struct in_addr *mask) -{ - int i; - unsigned long bits = ntohl(mask->s_addr); - /* too bad one can't check the carry bit, etc in c bit - * shifting */ - for (i = 0; i < 32 && !((bits >> i) & 1); i++); - return 32 - i; -} - - -/* Fill dest with the text of option 'option'. */ -static void fill_options(char *dest, uint8_t *option, struct dhcp_option *type_p) -{ - int type, optlen; - uint16_t val_u16; - int16_t val_s16; - uint32_t val_u32; - int32_t val_s32; - int len = option[OPT_LEN - 2]; - - dest += sprintf(dest, "%s=", type_p->name); - - type = type_p->flags & TYPE_MASK; - optlen = option_lengths[type]; - for(;;) { - switch (type) { - case OPTION_IP_PAIR: - dest += sprintip(dest, "", option); - *(dest++) = '/'; - option += 4; - optlen = 4; - case OPTION_IP: /* Works regardless of host byte order. */ - dest += sprintip(dest, "", option); - break; - case OPTION_BOOLEAN: - dest += sprintf(dest, *option ? "yes" : "no"); - break; - case OPTION_U8: - dest += sprintf(dest, "%u", *option); - break; - case OPTION_U16: - memcpy(&val_u16, option, 2); - dest += sprintf(dest, "%u", ntohs(val_u16)); - break; - case OPTION_S16: - memcpy(&val_s16, option, 2); - dest += sprintf(dest, "%d", ntohs(val_s16)); - break; - case OPTION_U32: - memcpy(&val_u32, option, 4); - dest += sprintf(dest, "%lu", (unsigned long) ntohl(val_u32)); - break; - case OPTION_S32: - memcpy(&val_s32, option, 4); - dest += sprintf(dest, "%ld", (long) ntohl(val_s32)); - break; - case OPTION_STRING: - memcpy(dest, option, len); - dest[len] = '\0'; - return; /* Short circuit this case */ - } - option += optlen; - len -= optlen; - if (len <= 0) break; - dest += sprintf(dest, " "); - } -} - - -/* put all the parameters into an environment */ -static char **fill_envp(struct dhcpMessage *packet) -{ - int num_options = 0; - int i, j; - char **envp; - uint8_t *temp; - struct in_addr subnet; - char over = 0; - - if (packet == NULL) - num_options = 0; - else { - for (i = 0; dhcp_options[i].code; i++) - if (get_option(packet, dhcp_options[i].code)) { - num_options++; - if (dhcp_options[i].code == DHCP_SUBNET) - num_options++; /* for mton */ - } - if (packet->siaddr) num_options++; - if ((temp = get_option(packet, DHCP_OPTION_OVER))) - over = *temp; - if (!(over & FILE_FIELD) && packet->file[0]) num_options++; - if (!(over & SNAME_FIELD) && packet->sname[0]) num_options++; - } - - envp = xcalloc(sizeof(char *), num_options + 5); - j = 0; - asprintf(&envp[j++], "interface=%s", client_config.interface); - asprintf(&envp[j++], "%s=%s", "PATH", - getenv("PATH") ? : "/bin:/usr/bin:/sbin:/usr/sbin"); - asprintf(&envp[j++], "%s=%s", "HOME", getenv("HOME") ? : "/"); - - if (packet == NULL) return envp; - - envp[j] = xmalloc(sizeof("ip=255.255.255.255")); - sprintip(envp[j++], "ip=", (uint8_t *) &packet->yiaddr); - - - for (i = 0; dhcp_options[i].code; i++) { - if (!(temp = get_option(packet, dhcp_options[i].code))) - continue; - envp[j] = xmalloc(upper_length(temp[OPT_LEN - 2], - dhcp_options[i].flags & TYPE_MASK) + strlen(dhcp_options[i].name) + 2); - fill_options(envp[j++], temp, &dhcp_options[i]); - - /* Fill in a subnet bits option for things like /24 */ - if (dhcp_options[i].code == DHCP_SUBNET) { - memcpy(&subnet, temp, 4); - asprintf(&envp[j++], "mask=%d", mton(&subnet)); - } - } - if (packet->siaddr) { - envp[j] = xmalloc(sizeof("siaddr=255.255.255.255")); - sprintip(envp[j++], "siaddr=", (uint8_t *) &packet->siaddr); - } - if (!(over & FILE_FIELD) && packet->file[0]) { - /* watch out for invalid packets */ - packet->file[sizeof(packet->file) - 1] = '\0'; - asprintf(&envp[j++], "boot_file=%s", packet->file); - } - if (!(over & SNAME_FIELD) && packet->sname[0]) { - /* watch out for invalid packets */ - packet->sname[sizeof(packet->sname) - 1] = '\0'; - asprintf(&envp[j++], "sname=%s", packet->sname); - } - return envp; -} - - -/* Call a script with a par file and env vars */ -void run_script(struct dhcpMessage *packet, const char *name) -{ - int pid; - char **envp, **curr; - - if (client_config.script == NULL) - return; - - DEBUG(LOG_INFO, "vforking and execle'ing %s", client_config.script); - - envp = fill_envp(packet); - /* call script */ - pid = vfork(); - if (pid) { - waitpid(pid, NULL, 0); - for (curr = envp; *curr; curr++) free(*curr); - free(envp); - return; - } else if (pid == 0) { - /* close fd's? */ - - /* exec script */ - execle(client_config.script, client_config.script, - name, NULL, envp); - LOG(LOG_ERR, "script %s failed: %m", client_config.script); - exit(1); - } -}