106 строки
2.5 KiB
C
106 строки
2.5 KiB
C
/*
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* pkd_util.c -- pkd utilities
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*
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* (c) 2014, 2018 Jon Simons <jon@jonsimons.org>
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*/
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#include <errno.h>
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#include <limits.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/wait.h>
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#include "pkd_client.h"
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#include "pkd_util.h"
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/**
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* @brief runs system(3); exits if that is interrupted with SIGINT/QUIT
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* @returns 0 upon success, non-zero otherwise
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*/
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int system_checked(const char *cmd) {
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int rc = system(cmd);
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if (WIFSIGNALED(rc) &&
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((WTERMSIG(rc) == SIGINT) || (WTERMSIG(rc) == SIGQUIT))) {
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exit(1);
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}
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if (rc == -1) {
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return -1;
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}
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return WEXITSTATUS(rc);
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}
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static int bin_exists(const char *binary) {
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char bin[1024] = { 0 };
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snprintf(&bin[0], sizeof(bin), "type %s 1>/dev/null 2>/dev/null", binary);
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return (system_checked(bin) == 0);
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}
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static int is_openssh_client_new_enough(void) {
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int rc = -1;
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FILE *fp = NULL;
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char version[1024] = { 0 };
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int version_ok = 0;
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unsigned long int major = 0;
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char *tmp = NULL;
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fp = popen("ssh -V 2>&1", "r");
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if (fp == NULL) {
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fprintf(stderr, "failed to get OpenSSH client version\n");
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goto done;
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}
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if (fgets(&version[0], sizeof(version), fp) == NULL) {
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fprintf(stderr, "failed to get OpenSSH client version string\n");
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goto errfgets;
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}
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/* "OpenSSH_<major>.<minor><SP>..." */
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if (strlen(version) < 11) {
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goto errversion;
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}
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/* Extract major. */
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major = strtoul(version + 8, &tmp, 10);
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if ((tmp == (version + 8)) ||
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((errno == ERANGE) && (major == ULONG_MAX)) ||
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((errno != 0) && (major == 0)) ||
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((major < 1) || (major > 100))) {
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fprintf(stderr, "failed to parse OpenSSH client version, "
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"errno %d\n", errno);
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goto errversion;
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}
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if (major < 7) {
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fprintf(stderr, "error: minimum OpenSSH client version "
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"required is 7, found: %ld\n", major);
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goto errversion;
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}
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version_ok = 1;
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errversion:
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errfgets:
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rc = pclose(fp);
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if (rc != 0) {
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fprintf(stderr, "failed to get OpenSSH client version: %d\n", rc);
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}
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done:
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return version_ok;
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}
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int is_openssh_client_enabled(void) {
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return (bin_exists(OPENSSH_BINARY) &&
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bin_exists(OPENSSH_KEYGEN) &&
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is_openssh_client_new_enough());
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}
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int is_dropbear_client_enabled(void) {
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return (bin_exists(DROPBEAR_BINARY) && bin_exists(DROPBEAR_KEYGEN));
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}
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