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This is an automatically generated e-mail. To reply, visit:
<a href="https://reviewboard.asterisk.org/r/1598/">https://reviewboard.asterisk.org/r/1598/</a>
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<p style="margin-top: 0;">On July 18th, 2013, 6:43 p.m. UTC, <b>rmudgett</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/1598/diff/6/?file=41561#file41561line11917" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/channels/chan_dahdi.c</a>
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(Diff revision 6)
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span>if (cur->channel >= start && cur->channel <= end) {</pre></td>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">This does not handle the "all" case where start=0, end=0.
If the "all" case is changed to 1 and MAX_INT then you don't have to also worry about the existing pseudo channel.</pre>
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<p>On July 22nd, 2013, 5:29 p.m. UTC, <b>Tzafrir Cohen</b> wrote:</p>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">This is a loop that is supposed to fail the call in advance if there is any existing channel in the range. Using the range 1-MAX_INT would fail this call if there is any existing channel. The special values 0 and 0 are checked for in build_channels (the values of wanted_channels_start and wanted_channels_end).</pre>
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<p>On July 22nd, 2013, 10:10 p.m. UTC, <b>rmudgett</b> wrote:</p>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Isn't the point of the "all" in dahdi_create_channels() to fail if there are any existing channels? This routine will not fail if the start,end is 0,0. It will ignore all channels because: if (cur->channel >= 0 && cur->channel <= 0)</pre>
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">1,MAX_INT will fail if there is any existing channel. 0,0 will not fail and thus create any non-existing channel. This was useful for me while testing and I believe may be useful elsewhere. I renamed "all" to "new". Is that clear enough?</pre>
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<p style="margin-top: 0;">On July 18th, 2013, 6:43 p.m. UTC, <b>rmudgett</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/1598/diff/6/?file=41561#file41561line15289" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/channels/chan_dahdi.c</a>
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(Diff revision 6)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int pri_destroy_dchan(struct sig_pri_span *pri)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span>pri_destroy_dchan(pri);</pre></td>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Call sig_pri_init_pri() after destroying the D channel here. At this point we know that the whole span is destroyed and we must setup to be able to recreate the span.</pre>
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<p>On July 22nd, 2013, 5:29 p.m. UTC, <b>Tzafrir Cohen</b> wrote:</p>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">I'm not sure why it should. But if this needs to be done, it should probably be called from pri_destroy_dchan() itself.</pre>
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<p>On July 22nd, 2013, 10:10 p.m. UTC, <b>rmudgett</b> wrote:</p>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">This could be dropped. We'll still be leaking memory anyway. I was concerned about settings from the previous setup bleeding through to the new setup. The setup_dahdi() code is likely assuming that is how the struct is setup when called.</pre>
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Right. It is needed. Without it, prepare_pri won't reopen the D channel's DAHDI channel.</pre>
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<p style="margin-top: 0;">On July 18th, 2013, 6:43 p.m. UTC, <b>rmudgett</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/1598/diff/6/?file=41561#file41561line15759" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/channels/chan_dahdi.c</a>
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(Diff revision 6)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static struct ast_cli_entry dahdi_mfcr2_cli[] = {</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span>start = atoi(a->argv[3]);</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span>if (start < 1) {</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span>ast_cli(a->fd, "Invalid starting channel number %s.\n",</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span>return CLI_FAILURE;</pre></td>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Use sscanf() instead of atoi().</pre>
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<p>On July 22nd, 2013, 5:29 p.m. UTC, <b>Tzafrir Cohen</b> wrote:</p>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">I prefer atoi() to sscanf in case the input will clearly not be 0. The replacement code with sscanf is less readable and IMHO slightly more error prone:
res = sscanf(a->argv[3], "%30d", &start); // why 30?
if (res != 1 || start < 1) {</pre>
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<p>On July 22nd, 2013, 10:10 p.m. UTC, <b>rmudgett</b> wrote:</p>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">The %30d is because of a bug in libc that caused a security vulnerability. Asterisk uses sscanf() throughout the code because bogus input is detectable where atoi() or strtol() would return 0.</pre>
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">See below regarding strtol(). Short version: Easy to assume here input is only valid if it is > 0.</pre>
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<p style="margin-top: 0;">On July 18th, 2013, 6:43 p.m. UTC, <b>rmudgett</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/1598/diff/6/?file=41561#file41561line15808" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/channels/chan_dahdi.c</a>
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(Diff revision 6)
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span>start = strtol(a->argv[3], &endptr, 10);</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span>if (!endptr || *endptr != '\0') {</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span>ast_cli(a->fd, "Invalid starting channel number '%s'.\n",</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span>return CLI_FAILURE;</pre></td>
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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">15809</font></th>
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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">15810</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span>if (a->argc == 5) {</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span>end = strtol(a->argv[4], &endptr, 10);</pre></td>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Use sscanf() instead of strtol().</pre>
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<p>On July 22nd, 2013, 5:29 p.m. UTC, <b>Tzafrir Cohen</b> wrote:</p>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">What's wrong with strtol? Reading again, I think I prefer here atoi() as above.</pre>
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<p>On July 22nd, 2013, 10:10 p.m. UTC, <b>rmudgett</b> wrote:</p>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">atoi and strtol are being replaced by sscanf() in the codebase because of better error detection.</pre>
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">strtol allows check for non-number input just as sscanf and the code here uses that check. What the code here misses, though, is a test for the number being > 0. atoi() can't tell the difference between no/invalid number and 0, but we don't really care here. And it is simpler (and thus: more readable) than the two alternatives.</pre>
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<p style="margin-top: 0;">On July 18th, 2013, 6:43 p.m. UTC, <b>rmudgett</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/1598/diff/6/?file=41561#file41561line17719" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/channels/chan_dahdi.c</a>
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<td colspan="2"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int build_channels(struct dahdi_chan_conf *conf, const char *value, int reload, int lineno, int *found_pseudo)</pre></td>
<td colspan="2"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int build_channels(struct dahdi_chan_conf *conf, const char *value, int reload, int lineno)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span>if ((conf->wanted_channels_start &&</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span>real_channel < conf->wanted_channels_start) ||</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span>(conf->wanted_channels_end &&</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span> real_channel > conf->wanted_channels_end)) {</pre></td>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">This test could be:
if (conf->wanted_channels_start && (real_channel < conf->wanted_channels_start || conf->wanted_channels_end < real_channel)) {
continue;
}
If you have a start channel you will have an end channel. Otherwise, you have no range and all channels need to be created.</pre>
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<p>On July 22nd, 2013, 5:29 p.m. UTC, <b>Tzafrir Cohen</b> wrote:</p>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">wanted_channel_start and wanted_channel_stop are defined to be independent. I don't want to assume anything else.</pre>
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<p>On July 22nd, 2013, 10:10 p.m. UTC, <b>rmudgett</b> wrote:</p>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">They are not used independently.</pre>
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">I don't really like it, but: OK.</pre>
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<p>- Tzafrir</p>
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<p>On July 22nd, 2013, 5:28 p.m. UTC, Tzafrir Cohen wrote:</p>
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<div>Review request for Asterisk Developers.</div>
<div>By Tzafrir Cohen.</div>
<p style="color: grey;"><i>Updated July 22, 2013, 5:28 p.m.</i></p>
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<b style="color: #575012; font-size: 10pt;">Repository: </b>
Asterisk
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Description </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">This code adds chan_dahdi the command 'dahdi create channels <range>' (where <range> is a single <n>-<m> or 'all') and updates 'dahdi destroy channel' with a similar 'dahdi destroy channels'.
This change is intended to provide a hook for a script running from udev once a span has been assigned ("registered") / unassigned ("unregistered") for its channels. The udev hook configures the span's channels with dahdi_cfg -S, and can then ask Asterisk to create ethe channels. See the scripts added to DAHDI-tools in 2.7.0.
This means that a separate DAHDI init script (running before the Asterisk one) would no longer be required. There is no longer a need to run a single command after all DAHDI devices are up.
If you use those new DAHDI settings you should set ignore_failed_channels in chan_dahdi.conf to avoid missing a channel failing the startup of chan_dahdi (with potentially other channels already available).</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Testing </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Works well with analog devices and mostly tested with ISDN devices.</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>/trunk/channels/chan_dahdi.c <span style="color: grey">(394567)</span></li>
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<p><a href="https://reviewboard.asterisk.org/r/1598/diff/" style="margin-left: 3em;">View Diff</a></p>
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