summaryrefslogtreecommitdiff
path: root/cmd/podman/shared/parse/parse.go
blob: 7bc2652cb47a102499957bd89c01cdf1d4c72778 (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
//nolint
// most of these validate and parse functions have been taken from projectatomic/docker
// and modified for cri-o
package parse

import (
	"bufio"
	"fmt"
	"net"
	"os"
	"regexp"
	"strings"

	"github.com/pkg/errors"
)

const (
	Protocol_TCP Protocol = 0
	Protocol_UDP Protocol = 1
)

type Protocol int32

// PortMapping specifies the port mapping configurations of a sandbox.
type PortMapping struct {
	// Protocol of the port mapping.
	Protocol Protocol `protobuf:"varint,1,opt,name=protocol,proto3,enum=runtime.Protocol" json:"protocol,omitempty"`
	// Port number within the container. Default: 0 (not specified).
	ContainerPort int32 `protobuf:"varint,2,opt,name=container_port,json=containerPort,proto3" json:"container_port,omitempty"`
	// Port number on the host. Default: 0 (not specified).
	HostPort int32 `protobuf:"varint,3,opt,name=host_port,json=hostPort,proto3" json:"host_port,omitempty"`
	// Host IP.
	HostIp string `protobuf:"bytes,4,opt,name=host_ip,json=hostIp,proto3" json:"host_ip,omitempty"`
}

// Note: for flags that are in the form <number><unit>, use the RAMInBytes function
// from the units package in docker/go-units/size.go

var (
	whiteSpaces  = " \t"
	alphaRegexp  = regexp.MustCompile(`[a-zA-Z]`)
	domainRegexp = regexp.MustCompile(`^(:?(:?[a-zA-Z0-9]|(:?[a-zA-Z0-9][a-zA-Z0-9\-]*[a-zA-Z0-9]))(:?\.(:?[a-zA-Z0-9]|(:?[a-zA-Z0-9][a-zA-Z0-9\-]*[a-zA-Z0-9])))*)\.?\s*$`)
)

// validateExtraHost validates that the specified string is a valid extrahost and returns it.
// ExtraHost is in the form of name:ip where the ip has to be a valid ip (ipv4 or ipv6).
// for add-host flag
func ValidateExtraHost(val string) (string, error) { //nolint
	// allow for IPv6 addresses in extra hosts by only splitting on first ":"
	arr := strings.SplitN(val, ":", 2)
	if len(arr) != 2 || len(arr[0]) == 0 {
		return "", fmt.Errorf("bad format for add-host: %q", val)
	}
	if _, err := validateIPAddress(arr[1]); err != nil {
		return "", fmt.Errorf("invalid IP address in add-host: %q", arr[1])
	}
	return val, nil
}

// validateIPAddress validates an Ip address.
// for dns, ip, and ip6 flags also
func validateIPAddress(val string) (string, error) {
	var ip = net.ParseIP(strings.TrimSpace(val))
	if ip != nil {
		return ip.String(), nil
	}
	return "", fmt.Errorf("%s is not an ip address", val)
}

func ValidateDomain(val string) (string, error) {
	if alphaRegexp.FindString(val) == "" {
		return "", fmt.Errorf("%s is not a valid domain", val)
	}
	ns := domainRegexp.FindSubmatch([]byte(val))
	if len(ns) > 0 && len(ns[1]) < 255 {
		return string(ns[1]), nil
	}
	return "", fmt.Errorf("%s is not a valid domain", val)
}

// reads a file of line terminated key=value pairs, and overrides any keys
// present in the file with additional pairs specified in the override parameter
// for env-file and labels-file flags
func ReadKVStrings(env map[string]string, files []string, override []string) error {
	for _, ef := range files {
		if err := parseEnvFile(env, ef); err != nil {
			return err
		}
	}
	for _, line := range override {
		if err := parseEnv(env, line); err != nil {
			return err
		}
	}
	return nil
}

func parseEnv(env map[string]string, line string) error {
	data := strings.SplitN(line, "=", 2)

	// catch invalid variables such as "=" or "=A"
	if data[0] == "" {
		return errors.Errorf("invalid environment variable: %q", line)
	}

	// trim the front of a variable, but nothing else
	name := strings.TrimLeft(data[0], whiteSpaces)
	if strings.ContainsAny(name, whiteSpaces) {
		return errors.Errorf("name %q has white spaces, poorly formatted name", name)
	}

	if len(data) > 1 {
		env[name] = data[1]
	} else {
		// if only a pass-through variable is given, clean it up.
		val, _ := os.LookupEnv(name)
		env[name] = val
	}
	return nil
}

// parseEnvFile reads a file with environment variables enumerated by lines
func parseEnvFile(env map[string]string, filename string) error {
	fh, err := os.Open(filename)
	if err != nil {
		return err
	}
	defer fh.Close()

	scanner := bufio.NewScanner(fh)
	for scanner.Scan() {
		// trim the line from all leading whitespace first
		line := strings.TrimLeft(scanner.Text(), whiteSpaces)
		// line is not empty, and not starting with '#'
		if len(line) > 0 && !strings.HasPrefix(line, "#") {
			if err := parseEnv(env, line); err != nil {
				return err
			}
		}
	}
	return scanner.Err()
}

// ValidateFileName returns an error if filename contains ":"
// as it is currently not supported
func ValidateFileName(filename string) error {
	if strings.Contains(filename, ":") {
		return errors.Errorf("invalid filename (should not contain ':') %q", filename)
	}
	return nil
}