aboutsummaryrefslogtreecommitdiff
path: root/pkg/specgenutil/util.go
blob: 15676d086a23a9578c1da77bab9c58183adf4f71 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
package specgenutil

import (
	"io/ioutil"
	"net"
	"strconv"
	"strings"

	"github.com/containers/podman/v3/libpod/network/types"
	"github.com/pkg/errors"
	"github.com/sirupsen/logrus"
)

// ReadPodIDFile reads the specified file and returns its content (i.e., first
// line).
func ReadPodIDFile(path string) (string, error) {
	content, err := ioutil.ReadFile(path)
	if err != nil {
		return "", errors.Wrap(err, "error reading pod ID file")
	}
	return strings.Split(string(content), "\n")[0], nil
}

// ReadPodIDFiles reads the specified files and returns their content (i.e.,
// first line).
func ReadPodIDFiles(files []string) ([]string, error) {
	ids := []string{}
	for _, file := range files {
		id, err := ReadPodIDFile(file)
		if err != nil {
			return nil, err
		}
		ids = append(ids, id)
	}
	return ids, nil
}

// ParseFilters transforms one filter format to another and validates input
func ParseFilters(filter []string) (map[string][]string, error) {
	// TODO Remove once filter refactor is finished and url.Values done.
	filters := map[string][]string{}
	for _, f := range filter {
		t := strings.SplitN(f, "=", 2)
		filters = make(map[string][]string)
		if len(t) < 2 {
			return map[string][]string{}, errors.Errorf("filter input must be in the form of filter=value: %s is invalid", f)
		}
		filters[t[0]] = append(filters[t[0]], t[1])
	}
	return filters, nil
}

// createExpose parses user-provided exposed port definitions and converts them
// into SpecGen format.
// TODO: The SpecGen format should really handle ranges more sanely - we could
// be massively inflating what is sent over the wire with a large range.
func createExpose(expose []string) (map[uint16]string, error) {
	toReturn := make(map[uint16]string)

	for _, e := range expose {
		// Check for protocol
		proto := "tcp"
		splitProto := strings.Split(e, "/")
		if len(splitProto) > 2 {
			return nil, errors.Errorf("invalid expose format - protocol can only be specified once")
		} else if len(splitProto) == 2 {
			proto = splitProto[1]
		}

		// Check for a range
		start, len, err := parseAndValidateRange(splitProto[0])
		if err != nil {
			return nil, err
		}

		var index uint16
		for index = 0; index < len; index++ {
			portNum := start + index
			protocols, ok := toReturn[portNum]
			if !ok {
				toReturn[portNum] = proto
			} else {
				newProto := strings.Join(append(strings.Split(protocols, ","), strings.Split(proto, ",")...), ",")
				toReturn[portNum] = newProto
			}
		}
	}

	return toReturn, nil
}

// CreatePortBindings iterates ports mappings into SpecGen format.
func CreatePortBindings(ports []string) ([]types.PortMapping, error) {
	// --publish is formatted as follows:
	// [[hostip:]hostport[-endPort]:]containerport[-endPort][/protocol]
	toReturn := make([]types.PortMapping, 0, len(ports))

	for _, p := range ports {
		var (
			ctrPort                 string
			proto, hostIP, hostPort *string
		)

		splitProto := strings.Split(p, "/")
		switch len(splitProto) {
		case 1:
			// No protocol was provided
		case 2:
			proto = &(splitProto[1])
		default:
			return nil, errors.Errorf("invalid port format - protocol can only be specified once")
		}

		remainder := splitProto[0]
		haveV6 := false

		// Check for an IPv6 address in brackets
		splitV6 := strings.Split(remainder, "]")
		switch len(splitV6) {
		case 1:
			// Do nothing, proceed as before
		case 2:
			// We potentially have an IPv6 address
			haveV6 = true
			if !strings.HasPrefix(splitV6[0], "[") {
				return nil, errors.Errorf("invalid port format - IPv6 addresses must be enclosed by []")
			}
			if !strings.HasPrefix(splitV6[1], ":") {
				return nil, errors.Errorf("invalid port format - IPv6 address must be followed by a colon (':')")
			}
			ipNoPrefix := strings.TrimPrefix(splitV6[0], "[")
			hostIP = &ipNoPrefix
			remainder = strings.TrimPrefix(splitV6[1], ":")
		default:
			return nil, errors.Errorf("invalid port format - at most one IPv6 address can be specified in a --publish")
		}

		splitPort := strings.Split(remainder, ":")
		switch len(splitPort) {
		case 1:
			if haveV6 {
				return nil, errors.Errorf("invalid port format - must provide host and destination port if specifying an IP")
			}
			ctrPort = splitPort[0]
		case 2:
			hostPort = &(splitPort[0])
			ctrPort = splitPort[1]
		case 3:
			if haveV6 {
				return nil, errors.Errorf("invalid port format - when v6 address specified, must be [ipv6]:hostPort:ctrPort")
			}
			hostIP = &(splitPort[0])
			hostPort = &(splitPort[1])
			ctrPort = splitPort[2]
		default:
			return nil, errors.Errorf("invalid port format - format is [[hostIP:]hostPort:]containerPort")
		}

		newPort, err := parseSplitPort(hostIP, hostPort, ctrPort, proto)
		if err != nil {
			return nil, err
		}

		toReturn = append(toReturn, newPort)
	}

	return toReturn, nil
}

// parseSplitPort parses individual components of the --publish flag to produce
// a single port mapping in SpecGen format.
func parseSplitPort(hostIP, hostPort *string, ctrPort string, protocol *string) (types.PortMapping, error) {
	newPort := types.PortMapping{}
	if ctrPort == "" {
		return newPort, errors.Errorf("must provide a non-empty container port to publish")
	}
	ctrStart, ctrLen, err := parseAndValidateRange(ctrPort)
	if err != nil {
		return newPort, errors.Wrapf(err, "error parsing container port")
	}
	newPort.ContainerPort = ctrStart
	newPort.Range = ctrLen

	if protocol != nil {
		if *protocol == "" {
			return newPort, errors.Errorf("must provide a non-empty protocol to publish")
		}
		newPort.Protocol = *protocol
	}
	if hostIP != nil {
		if *hostIP == "" {
			return newPort, errors.Errorf("must provide a non-empty container host IP to publish")
		} else if *hostIP != "0.0.0.0" {
			// If hostIP is 0.0.0.0, leave it unset - CNI treats
			// 0.0.0.0 and empty differently, Docker does not.
			testIP := net.ParseIP(*hostIP)
			if testIP == nil {
				return newPort, errors.Errorf("cannot parse %q as an IP address", *hostIP)
			}
			newPort.HostIP = testIP.String()
		}
	}
	if hostPort != nil {
		if *hostPort == "" {
			// Set 0 as a placeholder. The server side of Specgen
			// will find a random, open, unused port to use.
			newPort.HostPort = 0
		} else {
			hostStart, hostLen, err := parseAndValidateRange(*hostPort)
			if err != nil {
				return newPort, errors.Wrapf(err, "error parsing host port")
			}
			if hostLen != ctrLen {
				return newPort, errors.Errorf("host and container port ranges have different lengths: %d vs %d", hostLen, ctrLen)
			}
			newPort.HostPort = hostStart
		}
	}

	hport := newPort.HostPort
	logrus.Debugf("Adding port mapping from %d to %d length %d protocol %q", hport, newPort.ContainerPort, newPort.Range, newPort.Protocol)

	return newPort, nil
}

// Parse and validate a port range.
// Returns start port, length of range, error.
func parseAndValidateRange(portRange string) (uint16, uint16, error) {
	splitRange := strings.Split(portRange, "-")
	if len(splitRange) > 2 {
		return 0, 0, errors.Errorf("invalid port format - port ranges are formatted as startPort-stopPort")
	}

	if splitRange[0] == "" {
		return 0, 0, errors.Errorf("port numbers cannot be negative")
	}

	startPort, err := parseAndValidatePort(splitRange[0])
	if err != nil {
		return 0, 0, err
	}

	var rangeLen uint16 = 1
	if len(splitRange) == 2 {
		if splitRange[1] == "" {
			return 0, 0, errors.Errorf("must provide ending number for port range")
		}
		endPort, err := parseAndValidatePort(splitRange[1])
		if err != nil {
			return 0, 0, err
		}
		if endPort <= startPort {
			return 0, 0, errors.Errorf("the end port of a range must be higher than the start port - %d is not higher than %d", endPort, startPort)
		}
		// Our range is the total number of ports
		// involved, so we need to add 1 (8080:8081 is
		// 2 ports, for example, not 1)
		rangeLen = endPort - startPort + 1
	}

	return startPort, rangeLen, nil
}

// Turn a single string into a valid U16 port.
func parseAndValidatePort(port string) (uint16, error) {
	num, err := strconv.Atoi(port)
	if err != nil {
		return 0, errors.Wrapf(err, "invalid port number")
	}
	if num < 1 || num > 65535 {
		return 0, errors.Errorf("port numbers must be between 1 and 65535 (inclusive), got %d", num)
	}
	return uint16(num), nil
}