mirror of https://github.com/getdnsapi/getdns.git
Writability test for application data
This commit is contained in:
Willem Toorop
parent
aa74c0a3d5
commit
463855d274
18
src/anchor.c
18
src/anchor.c
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@ -1029,9 +1029,9 @@ static void tas_doc_read(getdns_context *context, tas_connection *a)
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else {
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context->trust_anchors = tas;
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context->trust_anchors_len = tas_len;
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_getdns_context_write_priv_file(
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(void) _getdns_context_write_priv_file(
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context, "root-anchors.xml", &a->xml);
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_getdns_context_write_priv_file(
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(void) _getdns_context_write_priv_file(
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context, "root-anchors.p7s", &p7s_bd);
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tas_success(context, a);
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return;
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@ -1403,7 +1403,7 @@ static void tas_connect(getdns_context *context, tas_connection *a)
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GETDNS_SCHEDULE_EVENT(a->loop, a->fd, 2000,
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getdns_eventloop_event_init(&a->event, a->req->owner,
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NULL, tas_write_cb, tas_timeout_cb));
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DEBUG_ANCHOR("Scheduled write\n");
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DEBUG_ANCHOR("Scheduled write with event\n");
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return;
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} else
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DEBUG_ANCHOR("Connect error: %s\n", strerror(errno));
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@ -1420,8 +1420,11 @@ static void tas_happy_eyeballs_cb(void *userarg)
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assert(dnsreq->netreqs[0]->request_type == GETDNS_RRTYPE_A);
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if (tas_fetching(&context->aaaa))
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return;
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else
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else {
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DEBUG_ANCHOR("AAAA came too late, clearing Happy Eyeballs timer\n");
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GETDNS_CLEAR_EVENT(context->a.loop, &context->a.event);
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tas_connect(context, &context->a);
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}
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}
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static void _tas_hostname_lookup_cb(getdns_dns_req *dnsreq)
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@ -1494,7 +1497,12 @@ void _getdns_start_fetching_ta(getdns_context *context, getdns_eventloop *loop)
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const char *verify_CA;
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const char *verify_email;
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if ((r = _getdns_get_tas_url_hostname(context, tas_hostname, NULL))) {
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if (!_getdns_context_can_write_appdata(context)) {
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DEBUG_ANCHOR("NOTICE %s(): Not fetching TA, because "
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"non writeable appdata directory\n", __FUNC__);
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return;
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} else if ((r = _getdns_get_tas_url_hostname(context, tas_hostname, NULL))) {
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DEBUG_ANCHOR("ERROR %s(): Could not get_tas_url_hostname"
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": \"%s\"", __FUNC__
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, getdns_get_errorstr_by_id(r));
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211
src/context.c
211
src/context.c
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@ -41,6 +41,7 @@
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#include <arpa/inet.h>
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#include <sys/time.h>
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#include <netdb.h>
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#include <pwd.h>
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#else
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#include <winsock2.h>
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#include <iphlpapi.h>
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@ -4601,82 +4602,202 @@ getdns_context_config(getdns_context *context, const getdns_dict *config_dict)
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return r;
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}
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static size_t _getdns_get_appdata(char *path)
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{
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size_t len;
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#ifdef USE_WINSOCK
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# define APPDATA_SUBDIR "getdns"
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if (! SUCCEEDED(SHGetFolderPath(NULL,
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CSIDL_APPDATA | CSIDL_FLAG_CREATE, NULL, 0, path)))
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DEBUG_ANCHOR("ERROR %s(): Could not get \%AppData\% directory\n"
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, __FUNC__);
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else if ((len = strlen(path)) + sizeof(APPDATA_SUBDIR) + 2 >= PATH_MAX)
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DEBUG_ANCHOR("ERROR %s(): Home path too long for appdata\n"
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, __FUNC__);
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#else
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# define APPDATA_SUBDIR ".getdns"
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struct passwd *p = getpwuid(getuid());
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char *home = NULL;
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if (!(home = p ? p->pw_dir : getenv("HOME")))
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DEBUG_ANCHOR("ERROR %s(): Could not get home directory\n"
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, __FUNC__);
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else if ((len = strlen(home)) + sizeof(APPDATA_SUBDIR) + 2 >= PATH_MAX)
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DEBUG_ANCHOR("ERROR %s(): Home path too long for appdata\n"
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, __FUNC__);
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else if (!strcpy(path, home))
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; /* strcpy returns path always */
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#endif
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else {
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if (len == 0 || ( path[len - 1] != '/'
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&& path[len - 1] != '\\')) {
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path[len++] = '/';
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path[len ] = '\0';
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}
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(void) strcpy(path + len, APPDATA_SUBDIR);
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len += sizeof(APPDATA_SUBDIR) - 1;
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if (mkdir(path, 0755) < 0 && errno != EEXIST)
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DEBUG_ANCHOR("ERROR %s(): Could not mkdir %s: %s\n"
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, __FUNC__, path, strerror(errno));
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else {
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path[len++] = '/';
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path[len ] = '\0';
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return len;
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}
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}
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return 0;
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}
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uint8_t *_getdns_context_get_priv_file(getdns_context *context,
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const char *fn, uint8_t *buf, size_t buf_len, size_t *file_sz)
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{
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char path[PATH_MAX];
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int n;
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FILE *f;
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FILE *f = NULL;
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size_t len;
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n = snprintf(path, sizeof(path), "%s/.getdns/%s", getenv("HOME"), fn);
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if (n < 0 || n > PATH_MAX)
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return NULL;
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if (!(len = _getdns_get_appdata(path)))
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DEBUG_ANCHOR("ERROR %s(): Could nog get application data path\n"
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, __FUNC__);
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if (!(f = fopen(path, "r")))
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return NULL;
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else if (len + strlen(fn) >= sizeof(path))
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DEBUG_ANCHOR("ERROR %s(): Application data too long\n", __FUNC__);
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if ((*file_sz = fread(buf, 1, buf_len, f)) < (buf_len - 1) && feof(f))
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else if (!strcpy(path + len, fn))
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; /* strcpy returns path + len always */
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else if (!(f = fopen(path, "r")))
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DEBUG_ANCHOR("ERROR %s(): Opening \"%s\": %s\n"
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, __FUNC__, path, strerror(errno));
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else if ((*file_sz = fread(buf, 1, buf_len, f)) < (buf_len - 1) && feof(f)) {
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buf[*file_sz] = 0;
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(void) fclose(f);
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return buf;
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}
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else if (fseek(f, 0, SEEK_END) < 0)
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buf = NULL;
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DEBUG_ANCHOR("ERROR %s(): Determining size of \"%s\": %s\n"
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, __FUNC__, path, strerror(errno));
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else if ((buf = GETDNS_XMALLOC(
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context->mf, uint8_t, (buf_len = ftell(f) + 1)))) {
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else if (!(buf = GETDNS_XMALLOC(
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context->mf, uint8_t, (buf_len = ftell(f) + 1))))
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DEBUG_ANCHOR("ERROR %s(): Allocating %d memory for \"%s\"\n"
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, __FUNC__, (int)buf_len, path);
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else {
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rewind(f);
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if ((*file_sz = fread(buf, 1, buf_len, f)) >= buf_len || !feof(f)) {
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GETDNS_FREE(context->mf, buf);
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buf = NULL;
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DEBUG_ANCHOR("ERROR %s(): Reading \"%s\": %s\n"
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, __FUNC__, path, strerror(errno));
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}
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else
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else {
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buf[*file_sz] = 0;
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}
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(void) fclose(f);
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return buf;
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}
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}
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if (f)
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(void) fclose(f);
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return NULL;
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}
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void _getdns_context_write_priv_file(getdns_context *context,
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int _getdns_context_write_priv_file(getdns_context *context,
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const char *fn, getdns_bindata *content)
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{
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char path[PATH_MAX], tmpfn[PATH_MAX];
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int n, fd;
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FILE *f;
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int fd = -1;
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FILE *f = NULL;
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size_t len;
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(void)context;
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if (!(len = _getdns_get_appdata(path)))
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DEBUG_ANCHOR("ERROR %s(): Could nog get application data path\n"
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, __FUNC__);
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DEBUG_ANCHOR("%s\n", __FUNC__);
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else if (len + 6 >= sizeof(tmpfn)
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|| len + strlen(fn) >= sizeof(path))
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DEBUG_ANCHOR("ERROR %s(): Application data too long\n", __FUNC__);
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n = snprintf( path, sizeof( path), "%s/.getdns/%s" , getenv("HOME"), fn);
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if (n < 0 || n > PATH_MAX) {
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DEBUG_ANCHOR("Could not create filename for writing\n");
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return;
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}
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n = snprintf(tmpfn, sizeof(tmpfn), "%s/.getdns/XXXXXX", getenv("HOME"));
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if (n < 0 || n > PATH_MAX) {
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DEBUG_ANCHOR("Could not create tmpfn for writing\n");
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return;
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}
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else if (snprintf(tmpfn, sizeof(tmpfn), "%sXXXXXX", path) < 0)
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DEBUG_ANCHOR("ERROR %s(): Creating temporary filename template\n"
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, __FUNC__);
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if ((fd = mkstemp(tmpfn)) < 0) {
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DEBUG_ANCHOR("Could not create temporary file from \"%s\": %s\n",
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tmpfn, strerror(errno));
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return;
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}
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else if (!strcpy(path + len, fn))
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; /* strcpy returns path + len always */
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if (!(f = fdopen(fd, "w"))) {
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close(fd);
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return;
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}
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if (fwrite(content->data, 1, content->size, f) != content->size)
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fclose(f);
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else if ((fd = mkstemp(tmpfn)) < 0)
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DEBUG_ANCHOR("ERROR %s(): Creating temporary file: %s\n"
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, __FUNC__, strerror(errno));
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else if (!(f = fdopen(fd, "w")))
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DEBUG_ANCHOR("ERROR %s(): Opening temporary file: %s\n"
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, __FUNC__, strerror(errno));
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else if (fwrite(content->data, 1, content->size, f) < content->size)
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DEBUG_ANCHOR("ERROR %s(): Writing temporary file: %s\n"
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, __FUNC__, strerror(errno));
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else if (fclose(f) < 0)
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DEBUG_ANCHOR("ERROR %s(): Closing temporary file: %s\n"
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, __FUNC__, strerror(errno));
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else if (rename(tmpfn, path) < 0)
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DEBUG_ANCHOR("ERROR %s(): Renaming temporary file: %s\n"
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, __FUNC__, strerror(errno));
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else {
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fclose(f);
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if (rename(tmpfn, path) == -1)
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DEBUG_ANCHOR("Could not mv \"%s\" \"%s\": %s\n",
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tmpfn, path, strerror(errno));
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context->can_write_appdata = PROP_ABLE;
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return 1;
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}
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if (f)
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(void) fclose(f);
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else if (fd >= 0)
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(void) close(fd);
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context->can_write_appdata = PROP_UNABLE;
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return 0;
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}
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int _getdns_context_can_write_appdata(getdns_context *context)
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{
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char test_fn[30], path[PATH_MAX];
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size_t len;
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getdns_bindata test_content = { 4, (void *)"TEST" };
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if (context->can_write_appdata == PROP_ABLE)
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return 1;
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else if (context->can_write_appdata == PROP_UNABLE)
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return 0;
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(void) snprintf( test_fn, sizeof(test_fn)
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, "write-test-%d.tmp", arc4random());
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if (!_getdns_context_write_priv_file(context, test_fn, &test_content))
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return 0;
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if (!(len = _getdns_get_appdata(path)))
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DEBUG_ANCHOR("ERROR %s(): Could nog get application data path\n"
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, __FUNC__);
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else if (len + strlen(test_fn) >= sizeof(path))
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DEBUG_ANCHOR("ERROR %s(): Application data too long\n", __FUNC__);
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else if (!strcpy(path + len, test_fn))
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; /* strcpy returns path + len always */
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else if (unlink(path) < 0)
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DEBUG_ANCHOR("ERROR %s(): Unlinking write test file \"%s\": %s\n"
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, __FUNC__, path, strerror(errno));
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return 1;
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}
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getdns_return_t
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@ -548,9 +548,11 @@ void _getdns_upstream_shutdown(getdns_upstream *upstream);
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uint8_t *_getdns_context_get_priv_file(getdns_context *context,
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const char *fn, uint8_t *buf, size_t buf_len, size_t *file_sz);
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void _getdns_context_write_priv_file(getdns_context *context,
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int _getdns_context_write_priv_file(getdns_context *context,
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const char *fn, getdns_bindata *content);
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int _getdns_context_can_write_appdata(getdns_context *context);
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void _getdns_upstream_reset(getdns_upstream *upstream);
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#endif /* _GETDNS_CONTEXT_H_ */
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