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server: verify strings are NULL terminated

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This commit is contained in:
Daniel Eklöf 2020-11-21 20:27:13 +01:00
parent fc81f413c0
commit f2a88d6071
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GPG key ID: 5BBD4992C116573F
1 changed files with 14 additions and 5 deletions
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19
server.c
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@ -200,6 +200,14 @@ fdm_client(struct fdm *fdm, int fd, int events, void *data)
goto shutdown; \
} while (0)
#define CHECK_BUF_AND_NULL(sz) do { \
CHECK_BUF(sz); \
if (sz == 0) \
goto shutdown; \
if (p[sz - 1] != '\0') \
goto shutdown; \
} while (0)
uint8_t *p = client->buffer.data;
const uint8_t *end = &client->buffer.data[client->buffer.idx];
@ -207,19 +215,19 @@ fdm_client(struct fdm *fdm, int fd, int events, void *data)
CHECK_BUF(sizeof(*cdata));
p += sizeof(*cdata);
CHECK_BUF(cdata->cwd_len);
CHECK_BUF_AND_NULL(cdata->cwd_len);
const char *cwd = (const char *)p; p += cdata->cwd_len;
LOG_DBG("CWD = %.*s", cdata->cwd_len, cwd);
CHECK_BUF(cdata->term_len);
CHECK_BUF_AND_NULL(cdata->term_len);
const char *term_env = (const char *)p; p += cdata->term_len;
LOG_DBG("TERM = %.*s", cdata->term_len, term_env);
CHECK_BUF(cdata->title_len);
CHECK_BUF_AND_NULL(cdata->title_len);
const char *title = (const char *)p; p += cdata->title_len;
LOG_DBG("title = %.*s", cdata->title_len, title);
CHECK_BUF(cdata->app_id_len);
CHECK_BUF_AND_NULL(cdata->app_id_len);
const char *app_id = (const char *)p; p += cdata->app_id_len;
LOG_DBG("app-id = %.*s", cdata->app_id_len, app_id);
@ -230,10 +238,11 @@ fdm_client(struct fdm *fdm, int fd, int events, void *data)
CHECK_BUF(sizeof(*arg));
p += sizeof(*arg);
CHECK_BUF(arg->len);
CHECK_BUF_AND_NULL(arg->len);
argv[i] = (char *)p; p += arg->len;
}
#undef CHECK_BUF_AND_NULL
#undef CHECK_BUF
client->conf = *server->conf;