+#define POP_CHECK_EOL(w, pd) \
+ ({ \
+ const char *__eol = strchr((pd)->ibuf.data, '\n'); \
+ if (!__eol) { \
+ if ((pd)->ibuf.len > POP_CMD_MAXLEN) \
+ return el_job_release((w), EL_ERROR); \
+ return 0; \
+ } \
+ __eol + 1; \
+ })
+
+static int pop_read_banner(job_t *w, pop_data_t *pd)
+{
+ const char *eol = POP_CHECK_EOL(w, pd);
+ const char *p, *q;
+
+ if (m_strncmp(pd->ibuf.data, "+OK", 3))
+ return el_job_release(w, EL_ERROR);
+
+ p = memchr(pd->ibuf.data, '<', eol - pd->ibuf.data);
+ if (p && (q = memchr(p + 1, '>', eol - p - 1))) {
+ pd->apop_token = p_dupstr(p, q + 1 - p);
+ }
+ buffer_consume_upto(&pd->ibuf, eol);
+
+ /* TODO do not check capa again */
+ pd->state = POP_CHECK_CAPA0;
+ buffer_addstr(&pd->obuf, "CAPA\r\n");
+ return el_job_setmode(w, EL_WRITING);
+}
+
+static int pop_check_capa(job_t *w, pop_data_t *pd)
+{
+ const char *p = POP_CHECK_EOL(w, pd);
+
+ if (!pd->multiline) {
+ if (m_strncmp(pd->ibuf.data, "+OK", 3)) {
+ pd->cmd_capa = CMD_NOT_AVAILABLE;
+ pd->cmd_stls = CMD_NOT_AVAILABLE;
+ goto end;
+ }
+ pd->multiline = true;
+ } else {
+ p = pd->ibuf.data;
+ }
+
+ for (;;) {
+ const char *q = strchr(p, '\n');
+ if (!q) {
+ buffer_consume_upto(&pd->ibuf, p);
+ return 0;
+ }
+ if (p[0] == '.' && p[1] != '.') {
+ buffer_consume_upto(&pd->ibuf, q);
+ break;
+ }
+ if (m_strcasestart(p, "SASL", &p)) {
+ p = skipspaces(p);
+ pd->auth_mechs = p_dupstr(p, q - p);
+ } else if (m_strcasestart(p, "STLS", NULL)) {
+ pd->cmd_stls = CMD_AVAILABLE;
+ } else if (m_strcasestart(p, "UIDL", NULL)) {
+ pd->cmd_uidl = CMD_AVAILABLE;
+ } else if (m_strcasestart(p, "TOP", NULL)) {
+ pd->cmd_top = CMD_AVAILABLE;
+ }
+ p = q;
+ }
+
+ end:
+ pd->multiline = false;
+ switch (pd->state) {
+ case POP_CHECK_CAPA0:
+ if (!pd->act.has_ssl && (pd->cmd_stls || mod_ssl.force_tls)) {
+ buffer_addstr(&pd->obuf, "STLS\r\n");
+ pd->state = POP_STLS;
+ return el_job_setmode(w, EL_WRITING);
+ }
+ /* FALLTHROUGH */
+ case POP_CHECK_CAPA1:
+ pd->state = POP_AUTHENTICATE;
+ /* TODO */
+ return -1;
+
+ case POP_CHECK_CAPA2:
+ pd->state = POP_STAT;
+ return -1;
+
+ default:
+ return el_job_release(w, EL_ERROR);
+ }
+}
+
+static int (*pop_actions[])(job_t *, pop_data_t *pd) = {
+ [POP_CONNECTING] = pop_read_banner,
+ [POP_CHECK_CAPA0] = pop_check_capa,
+ NULL,
+};
+